SEC Info  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Macquarie Infrastructure Holdings, LLC – ‘10-K’ for 12/31/21 – ‘EX-101.DEF’

On:  Tuesday, 2/22/22, at 7:03am ET   ·   For:  12/31/21   ·   Accession #:  1628280-22-3230   ·   File #:  1-40830

17 References:   

Find Words in Filings emoji
 
  in    Show  and   Hints

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 2/22/22  Macquarie Infrastructure Hol… LLC 10-K       12/31/21  109:16M                                    Workiva Inc Wde… FA01/FA

Annual Report   —   Form 10-K

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.88M 
 2: EX-21.1     Subsidiaries List                                   HTML     32K 
 3: EX-23.1     Consent of Expert or Counsel                        HTML     29K 
 4: EX-31.1     Certification -- §302 - SOA'02                      HTML     34K 
 5: EX-31.2     Certification -- §302 - SOA'02                      HTML     34K 
 6: EX-32.1     Certification -- §906 - SOA'02                      HTML     31K 
 7: EX-32.2     Certification -- §906 - SOA'02                      HTML     31K 
13: R1          Cover Page                                          HTML     91K 
14: R2          Audit Information                                   HTML     35K 
15: R3          Consolidated Balance Sheets                         HTML    155K 
16: R4          Consolidated Balance Sheets (Parenthetical)         HTML     44K 
17: R5          Consolidated Statements of Operations               HTML    185K 
18: R6          Consolidated Statements of Operations               HTML     32K 
                (Parenthetical)                                                  
19: R7          Consolidated Statements of Comprehensive Income     HTML     70K 
                (Loss)                                                           
20: R8          Consolidated Statements of Comprehensive Income     HTML     36K 
                (Loss) (Parenthetical)                                           
21: R9          Consolidated Statements of Unitholders' Equity      HTML    126K 
22: R10         Consolidated Statements of Unitholders' Equity      HTML     36K 
                (Parenthetical)                                                  
23: R11         Consolidated Statements of Cash Flows               HTML    161K 
24: R12         Organization and Description of Business            HTML     42K 
25: R13         Summary of Significant Accounting Policies          HTML     66K 
26: R14         Impact of COVID-19                                  HTML     33K 
27: R15         Discontinued Operations and Dispositions            HTML    106K 
28: R16         Leases                                              HTML     48K 
29: R17         Income per Unit                                     HTML     69K 
30: R18         Property, Equipment, Land and Leasehold             HTML     44K 
                Improvements                                                     
31: R19         Intangible Assets and Goodwill                      HTML     59K 
32: R20         Long-Term Debt                                      HTML     97K 
33: R21         Derivative Instruments and Hedging Activities       HTML     58K 
34: R22         Unitholders? Equity                                 HTML    137K 
35: R23         Revenue Recognition                                 HTML     46K 
36: R24         Related Party Transactions                          HTML     92K 
37: R25         Income Taxes                                        HTML     85K 
38: R26         Employee Benefit Plans                              HTML    358K 
39: R27         Legal Proceedings and Contingencies                 HTML     32K 
40: R28         Quarterly Data (Unaudited)                          HTML     88K 
41: R29         Summary of Significant Accounting Policies          HTML    126K 
                (Policies)                                                       
42: R30         Discontinued Operations and Dispositions (Tables)   HTML     78K 
43: R31         Leases (Tables)                                     HTML     49K 
44: R32         Income per Unit (Tables)                            HTML     71K 
45: R33         Property, Equipment, Land and Leasehold             HTML     43K 
                Improvements (Tables)                                            
46: R34         Intangible Assets and Goodwill (Tables)             HTML     62K 
47: R35         Long-Term Debt (Tables)                             HTML     98K 
48: R36         Derivative Instruments and Hedging Activities       HTML     54K 
                (Tables)                                                         
49: R37         Unitholders? Equity (Tables)                        HTML    125K 
50: R38         Revenue Recognition (Tables)                        HTML     41K 
51: R39         Related Party Transactions (Tables)                 HTML     77K 
52: R40         Income Taxes (Tables)                               HTML     84K 
53: R41         Employee Benefit Plans (Tables)                     HTML    358K 
54: R42         Quarterly Data (Unaudited) (Tables)                 HTML     88K 
55: R43         Organization and Description of Business (Details)  HTML     69K 
56: R44         Summary of Significant Accounting Policies          HTML     64K 
                (Details)                                                        
57: R45         Impact of COVID-19 (Details)                        HTML     40K 
58: R46         Discontinued Operations and Dispositions -          HTML     98K 
                Narrative (Details)                                              
59: R47         Discontinued Operations and Dispositions - Balance  HTML    102K 
                Sheet (Details)                                                  
60: R48         Discontinued Operations and Dispositions -          HTML    124K 
                Statement of Operations (Details)                                
61: R49         Leases - Narrative (Details)                        HTML     44K 
62: R50         Leases - Consolidated Statement of Operations       HTML     42K 
                (Details)                                                        
63: R51         Leases - Future Maturities of Lease Liabilities     HTML     49K 
                (Details)                                                        
64: R52         Income per Unit - Schedule of Reconciliation of     HTML     88K 
                the Basic and Diluted Income (Loss) per Unit                     
                Computations (Details)                                           
65: R53         Income per Unit - Schedule of Shares Excluded from  HTML     51K 
                Calculation (Details)                                            
66: R54         Property, Equipment, Land and Leasehold             HTML     52K 
                Improvements (Details)                                           
67: R55         Intangible Assets and Goodwill - Schedule of        HTML     43K 
                Intangible Assets (Details)                                      
68: R56         Intangible Assets and Goodwill - Narrative          HTML     37K 
                (Details)                                                        
69: R57         Intangible Assets and Goodwill - Schedule of        HTML     45K 
                Estimated Future Amortization Expense (Details)                  
70: R58         Intangible Assets and Goodwill - Schedule of        HTML     48K 
                Goodwill (Details)                                               
71: R59         Long-Term Debt - Narrative (Details)                HTML    148K 
72: R60         Long-Term Debt - Schedule of Long-Term Debt         HTML     54K 
                (Details)                                                        
73: R61         Long-Term Debt - Schedule of Future Maturities of   HTML     50K 
                Long-Term Debt (Details)                                         
74: R62         Long-Term Debt - Schedule of 2.00% Convertible      HTML     51K 
                Senior Notes (Details)                                           
75: R63         Long-Term Debt - Schedule of Interest Expense       HTML     50K 
                (Details)                                                        
76: R64         Long-Term Debt - Key Terms of 2.00% Convertible     HTML     37K 
                Senior Note (Details)                                            
77: R65         Long-Term Debt - Key Terms of Term Loan, Senior     HTML     45K 
                Notes and Revolving Credit Facility of Hawaii Gas                
                (Details)                                                        
78: R66         Derivative Instruments and Hedging Activities -     HTML     52K 
                Narrative (Details)                                              
79: R67         Derivative Instruments and Hedging Activities -     HTML     44K 
                Schedule of Fair Value of Derivative Instruments                 
                (Details)                                                        
80: R68         Derivative Instruments and Hedging Activities -     HTML     40K 
                Schedule of Location of Hedging Activities                       
                (Details)                                                        
81: R69         Unitholders? Equity - Narrative (Details)           HTML    145K 
82: R70         Unitholders? Equity - Schedule of Dividends         HTML     32K 
                (Details)                                                        
83: R71         Unitholders? Equity - Schedule of Stock Issued to   HTML     45K 
                Board of Directors (Details)                                     
84: R72         Unitholders? Equity - Schedule of Unvested Stock    HTML     92K 
                Unit (Details)                                                   
85: R73         Unitholders' Equity - Schedule of Accumulated       HTML     69K 
                Other Comprehensive Loss (Details)                               
86: R74         Revenue Recognition - Narrative (Details)           HTML     36K 
87: R75         Revenue Recognition - Schedule of Revenue from      HTML     45K 
                External Customers (Details)                                     
88: R76         Related Party Transactions - Narrative (Details)    HTML    136K 
89: R77         Related Party Transactions - Schedule of Dividends  HTML     35K 
                Paid to Manager (Details)                                        
90: R78         Related Party Transactions - Schedule of Base       HTML     48K 
                Management Fees and Performance Fees (Details)                   
91: R79         Income Taxes - Schedule of Components of Income     HTML     51K 
                Taxes (Details)                                                  
92: R80         Income Taxes - Narrative (Details)                  HTML     44K 
93: R81         Income Taxes - Schedule of Deferred Tax Assets and  HTML     61K 
                Liabilities (Details)                                            
94: R82         Income Taxes - Schedule of Reconciliation of        HTML     48K 
                Income Taxes (Details)                                           
95: R83         Employee Benefit Plans - Narrative (Details)        HTML     90K 
96: R84         Employee Benefit Plans - Schedule of Changes in     HTML     98K 
                Projected Benefit Obligations and Changes in Plan                
                Assets (Details)                                                 
97: R85         Employee Benefit Plans - Funded Status (Details)    HTML     55K 
98: R86         Employee Benefit Plans - Amounts not yet reflected  HTML     67K 
                in Net Periodic Benefit Cost and Included in                     
                Accumulated Other Comprehensive Loss (Details)                   
99: R87         Employee Benefit Plans - Amortized from             HTML     41K 
                Accumulated Other Comprehensive Income (Loss) over               
                the Next Year (Details)                                          
100: R88         Employee Benefit Plans - Components of Net          HTML    119K  
                Periodic Benefit Cost and Other Changes in Other                 
                Comprehensive Loss (Income) for Plans (Details)                  
101: R89         Employee Benefit Plans - Asset Allocation           HTML     43K  
                (Details)                                                        
102: R90         Employee Benefit Plans - Asset Allocations          HTML     67K  
                (Details)                                                        
103: R91         Employee Benefit Plans - Estimated Future Benefit   HTML     44K  
                Payments (Details)                                               
104: R92         Quarterly Data (Unaudited) (Details)                HTML     89K  
107: XML         IDEA XML File -- Filing Summary                      XML    200K  
105: XML         XBRL Instance -- mic-20211231_htm                    XML   4.44M  
106: EXCEL       IDEA Workbook of Financial Reports                  XLSX    164K  
 9: EX-101.CAL  XBRL Calculations -- mic-20211231_cal                XML    354K 
10: EX-101.DEF  XBRL Definitions -- mic-20211231_def                 XML   1.20M 
11: EX-101.LAB  XBRL Labels -- mic-20211231_lab                      XML   2.49M 
12: EX-101.PRE  XBRL Presentations -- mic-20211231_pre               XML   1.69M 
 8: EX-101.SCH  XBRL Schema -- mic-20211231                          XSD    253K 
108: JSON        XBRL Instance as JSON Data -- MetaLinks              597±   877K  
109: ZIP         XBRL Zipped Folder -- 0001628280-22-003230-xbrl      Zip    844K  


‘EX-101.DEF’   —   XBRL Definitions — mic-20211231_def


This Exhibit is an XBRL XML File.


                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<!-- XBRL Document Created with Wdesk from Workiva -->
<!-- Copyright 2022 Workiva -->
<!-- r:8e64fd24-fba9-41e0-891c-ff20d877dc0d,g:7814e18d-c6c8-4591-9f00-b6a1d59ca546 -->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
<link:roleRef roleURI="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical" xlink:type="simple" xlink:href="mic-20211231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical" xlink:type="extended" id="i265252c64e3849c4a97a1c55f3e743ec_CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_79270f4d-b3dd-4a45-98ba-17d990f83946" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_bf971187-d188-4ecf-8ec5-198a67e138bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_79270f4d-b3dd-4a45-98ba-17d990f83946" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_bf971187-d188-4ecf-8ec5-198a67e138bb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_9210ecae-0694-45b8-b0e0-e677bfa03096" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_79270f4d-b3dd-4a45-98ba-17d990f83946" xlink:to="loc_us-gaap_StatementTable_9210ecae-0694-45b8-b0e0-e677bfa03096" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_4dbfa954-a539-4f40-9ac3-493d1d992814" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_9210ecae-0694-45b8-b0e0-e677bfa03096" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_4dbfa954-a539-4f40-9ac3-493d1d992814" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_4dbfa954-a539-4f40-9ac3-493d1d992814_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4dbfa954-a539-4f40-9ac3-493d1d992814" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_4dbfa954-a539-4f40-9ac3-493d1d992814_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c9d46f56-f7c0-4088-bb28-1d88f6370807" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4dbfa954-a539-4f40-9ac3-493d1d992814" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c9d46f56-f7c0-4088-bb28-1d88f6370807" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_999146d6-d269-43bf-b88e-5b4ba9604c8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c9d46f56-f7c0-4088-bb28-1d88f6370807" xlink:to="loc_us-gaap_InterestExpenseMember_999146d6-d269-43bf-b88e-5b4ba9604c8c" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITY" xlink:type="simple" xlink:href="mic-20211231.xsd#CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITY"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITY" xlink:type="extended" id="ic3a0408f36214889bb9fe58ceb07b8b4_CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITY">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_34676f62-2e28-4d57-beee-6fd3566cd5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34676f62-2e28-4d57-beee-6fd3566cd5e5" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitOutstanding_35c98d54-819f-4603-9786-8fa88011c727" xlink:href="mic-20211231.xsd#mic_SpecialUnitOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_mic_SpecialUnitOutstanding_35c98d54-819f-4603-9786-8fa88011c727" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitOutstanding_a1b06eb6-e26c-4cfa-9ad5-92becafe55d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_CommonUnitOutstanding_a1b06eb6-e26c-4cfa-9ad5-92becafe55d3" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_90425fcc-f978-4bd7-a409-03036f892494" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_90425fcc-f978-4bd7-a409-03036f892494" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_3619208b-860d-4a31-bc50-cff75529edb6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_3619208b-860d-4a31-bc50-cff75529edb6" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_0a8de01d-d172-467f-8652-c70848beed97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_0a8de01d-d172-467f-8652-c70848beed97" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_e522275a-520c-4dbf-9eae-398bf4bdbbe8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_e522275a-520c-4dbf-9eae-398bf4bdbbe8" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_49f2b14c-0bcf-4b5e-a42f-892e2e86e281" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_49f2b14c-0bcf-4b5e-a42f-892e2e86e281" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7b104f6d-2f42-49ed-b23f-103b1ef2115d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7b104f6d-2f42-49ed-b23f-103b1ef2115d" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_a9c97a5a-a8de-4ba0-8b00-3d468a25fd7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_a9c97a5a-a8de-4ba0-8b00-3d468a25fd7c" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DistributionMadeToCommonUnitholdersValue_cc8e4828-5f73-410a-ae5b-0102581c7993" xlink:href="mic-20211231.xsd#mic_DistributionMadeToCommonUnitholdersValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_mic_DistributionMadeToCommonUnitholdersValue_cc8e4828-5f73-410a-ae5b-0102581c7993" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_22620ff8-9745-43f6-b21d-8b80dbc35ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_22620ff8-9745-43f6-b21d-8b80dbc35ff0" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_7789ddab-c920-484a-99da-066969640bc5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_7789ddab-c920-484a-99da-066969640bc5" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation_f6ad3431-3779-4cb2-ace9-1d33b4d8a96a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation_f6ad3431-3779-4cb2-ace9-1d33b4d8a96a" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_95cf2a1a-8069-49ee-91bd-6b6db44c6b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01f575ce-9d36-40fb-90ae-50f9fe10175b" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_95cf2a1a-8069-49ee-91bd-6b6db44c6b5e" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitOutstanding_0aa509ac-99b1-475c-a030-1b01fba7d540" xlink:href="mic-20211231.xsd#mic_SpecialUnitOutstanding"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitOutstanding_b2a980cd-da2c-4e45-965f-819b4d27f0d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitOutstanding"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_ea750b69-3f30-4ac5-ab77-7da2391a62e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdateExtensibleList_e1b3fa69-ae7c-4d72-bca2-5bf1d472d676" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdateExtensibleList"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_34676f62-2e28-4d57-beee-6fd3566cd5e5" xlink:to="loc_us-gaap_AccountingStandardsUpdateExtensibleList_e1b3fa69-ae7c-4d72-bca2-5bf1d472d676" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1cdbf100-8c8b-48a6-ac5d-aec941082542" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_34676f62-2e28-4d57-beee-6fd3566cd5e5" xlink:to="loc_us-gaap_StatementTable_1cdbf100-8c8b-48a6-ac5d-aec941082542" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8d826fca-a351-4f82-b26e-28bdc2004a24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1cdbf100-8c8b-48a6-ac5d-aec941082542" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8d826fca-a351-4f82-b26e-28bdc2004a24" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8d826fca-a351-4f82-b26e-28bdc2004a24_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8d826fca-a351-4f82-b26e-28bdc2004a24" xlink:to="loc_us-gaap_EquityComponentDomain_8d826fca-a351-4f82-b26e-28bdc2004a24_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_61b756f7-5e8f-4dc0-a41a-c355b1cbce69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8d826fca-a351-4f82-b26e-28bdc2004a24" xlink:to="loc_us-gaap_EquityComponentDomain_61b756f7-5e8f-4dc0-a41a-c355b1cbce69" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ParentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_61b756f7-5e8f-4dc0-a41a-c355b1cbce69" xlink:to="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitsMember_17baba75-9feb-4f87-885f-6f1dfab3349b" xlink:href="mic-20211231.xsd#mic_SpecialUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:to="loc_mic_SpecialUnitsMember_17baba75-9feb-4f87-885f-6f1dfab3349b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MemberUnitsMember_893a5821-3173-43ce-a641-e81b44422e47" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MemberUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:to="loc_us-gaap_MemberUnitsMember_893a5821-3173-43ce-a641-e81b44422e47" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_f319a469-108b-4bec-b3f4-5dc0816380ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_f319a469-108b-4bec-b3f4-5dc0816380ba" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_368ee2e3-9641-4dfd-a3d8-41262c709026" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_368ee2e3-9641-4dfd-a3d8-41262c709026" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_581f0cd6-92ca-4e37-bba1-4ee0d714d614" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c80c95a9-6c4a-4af2-bc1b-645e3e254e13" xlink:to="loc_us-gaap_RetainedEarningsMember_581f0cd6-92ca-4e37-bba1-4ee0d714d614" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_87cb4cd0-acb7-4459-b1f9-5d1d6154ebe1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_61b756f7-5e8f-4dc0-a41a-c355b1cbce69" xlink:to="loc_us-gaap_NoncontrollingInterestMember_87cb4cd0-acb7-4459-b1f9-5d1d6154ebe1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_ad1bace2-6b53-4be1-9828-4b3180abc05c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1cdbf100-8c8b-48a6-ac5d-aec941082542" xlink:to="loc_srt_TitleOfIndividualAxis_ad1bace2-6b53-4be1-9828-4b3180abc05c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ad1bace2-6b53-4be1-9828-4b3180abc05c_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_ad1bace2-6b53-4be1-9828-4b3180abc05c" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ad1bace2-6b53-4be1-9828-4b3180abc05c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2b3c719e-ae01-4430-8d4c-6211ebe87203" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_ad1bace2-6b53-4be1-9828-4b3180abc05c" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2b3c719e-ae01-4430-8d4c-6211ebe87203" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ManagerMember_b04e91c0-2b42-401c-8359-3a2485d4f1b8" xlink:href="mic-20211231.xsd#mic_ManagerMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2b3c719e-ae01-4430-8d4c-6211ebe87203" xlink:to="loc_mic_ManagerMember_b04e91c0-2b42-401c-8359-3a2485d4f1b8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a28bf25c-4721-4265-979c-56c29fb6b10c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1cdbf100-8c8b-48a6-ac5d-aec941082542" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a28bf25c-4721-4265-979c-56c29fb6b10c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a28bf25c-4721-4265-979c-56c29fb6b10c_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a28bf25c-4721-4265-979c-56c29fb6b10c" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a28bf25c-4721-4265-979c-56c29fb6b10c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_96c8edea-7245-47a1-aef0-6aa866af8cc8" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a28bf25c-4721-4265-979c-56c29fb6b10c" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_96c8edea-7245-47a1-aef0-6aa866af8cc8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_fff07689-39b2-4120-a28b-046daff06295" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_96c8edea-7245-47a1-aef0-6aa866af8cc8" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_fff07689-39b2-4120-a28b-046daff06295" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITYParenthetical" xlink:type="simple" xlink:href="mic-20211231.xsd#CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITYParenthetical"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITYParenthetical" xlink:type="extended" id="i0a0870355aa04923b76c6b3554ac5906_CONSOLIDATEDSTATEMENTSOFUNITHOLDERSEQUITYParenthetical">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_729ca2af-75c9-4059-884f-876c3f041abd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitAuthorized_6f732951-0560-4e78-bfa6-fccdd497d035" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_729ca2af-75c9-4059-884f-876c3f041abd" xlink:to="loc_us-gaap_CommonUnitAuthorized_6f732951-0560-4e78-bfa6-fccdd497d035" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationNoncontrollingInterest_8f309f7c-bf3d-4ff9-95d0-211f2dad8cdc" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_729ca2af-75c9-4059-884f-876c3f041abd" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationNoncontrollingInterest_8f309f7c-bf3d-4ff9-95d0-211f2dad8cdc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_04fc1e92-9bb3-40e2-a8f3-98b8970a4b99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_729ca2af-75c9-4059-884f-876c3f041abd" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_04fc1e92-9bb3-40e2-a8f3-98b8970a4b99" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_66766fbc-f026-4e86-b131-deba7923d452" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_729ca2af-75c9-4059-884f-876c3f041abd" xlink:to="loc_us-gaap_StatementTable_66766fbc-f026-4e86-b131-deba7923d452" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_e8548784-47a5-48b8-95e0-edec7eb3759c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_66766fbc-f026-4e86-b131-deba7923d452" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_e8548784-47a5-48b8-95e0-edec7eb3759c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e8548784-47a5-48b8-95e0-edec7eb3759c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e8548784-47a5-48b8-95e0-edec7eb3759c" xlink:to="loc_us-gaap_EquityComponentDomain_e8548784-47a5-48b8-95e0-edec7eb3759c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0ba71011-2ea1-47aa-9882-a0c6733b80d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e8548784-47a5-48b8-95e0-edec7eb3759c" xlink:to="loc_us-gaap_EquityComponentDomain_0ba71011-2ea1-47aa-9882-a0c6733b80d5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_9234e347-966c-4db6-86dd-8d9ce0ca0bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_0ba71011-2ea1-47aa-9882-a0c6733b80d5" xlink:to="loc_us-gaap_RetainedEarningsMember_9234e347-966c-4db6-86dd-8d9ce0ca0bf9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_66766fbc-f026-4e86-b131-deba7923d452" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_df112877-42d2-4240-9d97-36cb2ab3b06e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_a0bc15a7-62a6-46bc-86ae-c1c68ee19b5e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_df112877-42d2-4240-9d97-36cb2ab3b06e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_3e76b2fb-3b0a-47e7-931e-8d1e2ad715bf" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_df112877-42d2-4240-9d97-36cb2ab3b06e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_3e76b2fb-3b0a-47e7-931e-8d1e2ad715bf" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="mic-20211231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended" id="i552bf7d2ff1d424cb5f00460ee047d20_CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_fb9c1acb-f8e0-4e5b-9fa2-55495bd894b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_fb9c1acb-f8e0-4e5b-9fa2-55495bd894b9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_d8c970e0-6050-4894-9016-c46506906fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_fb9c1acb-f8e0-4e5b-9fa2-55495bd894b9" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_d8c970e0-6050-4894-9016-c46506906fb9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_fb9c1acb-f8e0-4e5b-9fa2-55495bd894b9" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_7f01343e-53fe-44d8-8921-fcbd8896bf97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Depreciation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_Depreciation_7f01343e-53fe-44d8-8921-fcbd8896bf97" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_aca9937b-8919-4581-899d-0bd3cd53391c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_aca9937b-8919-4581-899d-0bd3cd53391c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_41ba0f64-9aa1-4baf-9f5d-54287ea214d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_41ba0f64-9aa1-4baf-9f5d-54287ea214d9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_7402b829-9596-4ced-a72f-b321106b3044" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_7402b829-9596-4ced-a72f-b321106b3044" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_dc63f33f-cd52-4db1-b945-b1de8e729fbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_dc63f33f-cd52-4db1-b945-b1de8e729fbe" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_FeesToManagerSettledInShares_69f81f85-5dfa-4e27-bb0e-e7bd71ac197c" xlink:href="mic-20211231.xsd#mic_FeesToManagerSettledInShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_mic_FeesToManagerSettledInShares_69f81f85-5dfa-4e27-bb0e-e7bd71ac197c" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_151139bf-5f13-4838-8d2b-9860a2d34de0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_151139bf-5f13-4838-8d2b-9860a2d34de0" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_c2b116e9-80c7-46ce-862f-e24fed42c4a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_c2b116e9-80c7-46ce-862f-e24fed42c4a6" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_f7cc0e90-3f6c-48b4-81b8-2249da99424d" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0e47f70b-f24f-4f6d-b170-452631ace949" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0e47f70b-f24f-4f6d-b170-452631ace949" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_0cf3368c-a157-4a5c-bddd-fe34dd0efd05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_0cf3368c-a157-4a5c-bddd-fe34dd0efd05" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_7c7fbe4a-d7b3-4508-b11b-5e6fefd81cce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_7c7fbe4a-d7b3-4508-b11b-5e6fefd81cce" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_02a7e19d-b71c-4f6c-b7c3-73ec3e34add3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_02a7e19d-b71c-4f6c-b7c3-73ec3e34add3" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_483a765f-d4c8-40e3-b8e4-9e386352f47d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_483a765f-d4c8-40e3-b8e4-9e386352f47d" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_28b96064-6885-4f29-a3ec-8355bb24f624" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_2aaa610e-26c8-4d3d-9f98-ac5deb286683" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_28b96064-6885-4f29-a3ec-8355bb24f624" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_28cf3a18-ed4d-4bf4-bd27-2c021d38fac5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_fb9c1acb-f8e0-4e5b-9fa2-55495bd894b9" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_28cf3a18-ed4d-4bf4-bd27-2c021d38fac5" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_ad35ab20-f47c-40c2-a3b5-ff8061464c44" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_ad35ab20-f47c-40c2-a3b5-ff8061464c44" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2306a72d-eb02-432e-b65b-41a84c6009a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2306a72d-eb02-432e-b65b-41a84c6009a4" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d2795dc3-1a51-428a-8194-893199c4ca64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_d2795dc3-1a51-428a-8194-893199c4ca64" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_d2414f88-040c-4a42-8268-a15c3efcc0a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_dcfec3a9-b853-44fa-baaa-380595320b68" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_d2414f88-040c-4a42-8268-a15c3efcc0a7" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_a6193a94-f2e7-4406-a80d-6dce6e58d6c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_a6193a94-f2e7-4406-a80d-6dce6e58d6c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_afba97b5-aa19-4ab4-83fd-f6ae2031053c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividends"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_PaymentsOfDividends_afba97b5-aa19-4ab4-83fd-f6ae2031053c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_9b676bce-e14c-4b46-b28b-285390fd7432" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToMinorityShareholders"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_9b676bce-e14c-4b46-b28b-285390fd7432" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_27789e26-0365-448a-ab23-b6c019f0573a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_27789e26-0365-448a-ab23-b6c019f0573a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_418eedba-4724-4c92-b90e-3a3f96a0b306" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_418eedba-4724-4c92-b90e-3a3f96a0b306" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_1c371188-ee06-4639-8808-29412b9198cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInContinuingOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_fc6c1dbc-00dc-4b3b-b5bb-535b78552cb5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_1c371188-ee06-4639-8808-29412b9198cf" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_9d974640-7ca1-4ca5-b9ac-a1aa36b4bc9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_9d974640-7ca1-4ca5-b9ac-a1aa36b4bc9b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_79caff44-edbe-4dc9-8d1d-8cadcd0892de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_79caff44-edbe-4dc9-8d1d-8cadcd0892de" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_c5b4c9b8-35ec-4f8d-96e4-3f113bae8fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_c5b4c9b8-35ec-4f8d-96e4-3f113bae8fb9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_c82aa872-55cb-4c9c-aeaf-1f70ef7d4bac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperationsAbstract_c1cd8e12-7e29-4497-a786-829332b7c6f4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_c82aa872-55cb-4c9c-aeaf-1f70ef7d4bac" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_6d6bf182-6244-4fe4-8713-6ca26abd9208" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_6d6bf182-6244-4fe4-8713-6ca26abd9208" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2cf24b25-7333-425a-8165-fb3cfa11d756" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_2cf24b25-7333-425a-8165-fb3cfa11d756" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_d64a6de1-944a-4451-8e6f-ddc2186526f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_d64a6de1-944a-4451-8e6f-ddc2186526f4" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_8fee7fca-0059-4eed-a7a0-cb8686cbbe01" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_23b250cf-6dfc-4745-8a34-6966250e41af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_23b250cf-6dfc-4745-8a34-6966250e41af" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_aaf5a938-ec71-47e0-92c2-0c8fc6d30e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_aaf5a938-ec71-47e0-92c2-0c8fc6d30e7b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_2132977c-5816-4782-88ce-079e51a8631e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_2132977c-5816-4782-88ce-079e51a8631e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_9998bf9b-376e-4e2b-9d13-ffb306e88822" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_9998bf9b-376e-4e2b-9d13-ffb306e88822" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_94c7d987-0865-4969-a95f-a3caba41ce92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaidNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_796c76b3-f89f-4f05-a03e-a05fdb1bc2c9" xlink:to="loc_us-gaap_InterestPaidNet_94c7d987-0865-4969-a95f-a3caba41ce92" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_1b9ebf31-25c2-4cd5-8e4b-e0111c4a32d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_1b9ebf31-25c2-4cd5-8e4b-e0111c4a32d2" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4795efe9-af78-476d-ad0c-280f7a62eb68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_1b9ebf31-25c2-4cd5-8e4b-e0111c4a32d2" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_4795efe9-af78-476d-ad0c-280f7a62eb68" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_937c4180-6f75-48a5-b58b-3b02ec10d791" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_1b9ebf31-25c2-4cd5-8e4b-e0111c4a32d2" xlink:to="loc_us-gaap_RestrictedCashCurrent_937c4180-6f75-48a5-b58b-3b02ec10d791" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_39c3a8a1-85f2-4e21-b2f8-b289d30f3c66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_1b9ebf31-25c2-4cd5-8e4b-e0111c4a32d2" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_39c3a8a1-85f2-4e21-b2f8-b289d30f3c66" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_105ed793-732f-40f8-a6b2-48220c74eaac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_26763315-11f8-4ed6-85e3-9edb08714fba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_db908f1d-1973-407a-97cb-8adc8d133037" xlink:to="loc_us-gaap_StatementTable_26763315-11f8-4ed6-85e3-9edb08714fba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_e75b8012-f8e0-456c-a3c5-48e381a96457" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_26763315-11f8-4ed6-85e3-9edb08714fba" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_e75b8012-f8e0-456c-a3c5-48e381a96457" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_e75b8012-f8e0-456c-a3c5-48e381a96457_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_e75b8012-f8e0-456c-a3c5-48e381a96457" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_e75b8012-f8e0-456c-a3c5-48e381a96457_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_ff0c073c-be42-4936-8014-d2487b4ab40f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_e75b8012-f8e0-456c-a3c5-48e381a96457" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_ff0c073c-be42-4936-8014-d2487b4ab40f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentContinuingOperationsMember_81bf6ab3-71db-447c-ae82-137bd1d20aec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentContinuingOperationsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_ff0c073c-be42-4936-8014-d2487b4ab40f" xlink:to="loc_us-gaap_SegmentContinuingOperationsMember_81bf6ab3-71db-447c-ae82-137bd1d20aec" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDiscontinuedOperationsMember_c8f094cb-1583-4b5e-946c-8000ca835461" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDiscontinuedOperationsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_ff0c073c-be42-4936-8014-d2487b4ab40f" xlink:to="loc_us-gaap_SegmentDiscontinuedOperationsMember_c8f094cb-1583-4b5e-946c-8000ca835461" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/OrganizationandDescriptionofBusinessDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#OrganizationandDescriptionofBusinessDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/OrganizationandDescriptionofBusinessDetails" xlink:type="extended" id="iad3c4d21d322480b9ed180c12ccf2e13_OrganizationandDescriptionofBusinessDetails">
<link:loc xlink:type="locator" xlink:label="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:href="mic-20211231.xsd#mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfOperatingBusinesses_93db2581-1ede-4f87-aff4-66da9608156f" xlink:href="mic-20211231.xsd#mic_NumberOfOperatingBusinesses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_mic_NumberOfOperatingBusinesses_93db2581-1ede-4f87-aff4-66da9608156f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_8ce3d165-a7ca-4587-b69a-74de28d959e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_8ce3d165-a7ca-4587-b69a-74de28d959e4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_297eeba1-0959-4bc3-aebc-e3371b1c9cba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_297eeba1-0959-4bc3-aebc-e3371b1c9cba" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_710cd6e9-9197-4b70-9422-afcc4fc6d44f" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_710cd6e9-9197-4b70-9422-afcc4fc6d44f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConversionOfStockConversionRatio_1c3ad291-247b-4880-ae12-33c85573f091" xlink:href="mic-20211231.xsd#mic_ConversionOfStockConversionRatio"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_mic_ConversionOfStockConversionRatio_1c3ad291-247b-4880-ae12-33c85573f091" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_d29fe90b-0ef3-4b78-a724-a8eb4860f2af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_d29fe90b-0ef3-4b78-a724-a8eb4860f2af" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialDividendPerUnit_ca174650-adc3-43c7-8697-a1c1d862884e" xlink:href="mic-20211231.xsd#mic_SpecialDividendPerUnit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_mic_SpecialDividendPerUnit_ca174650-adc3-43c7-8697-a1c1d862884e" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:href="mic-20211231.xsd#mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_0fee917c-d3da-4ac7-82f2-eb8ceea83075" xlink:to="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateAxis_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateAxis_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateDomain_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44_default" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateAxis_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateDomain_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateDomain_b4a12daa-2dd6-4e24-b09e-43e80015e7ac" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateAxis_1a032cb9-4f75-45a8-ae52-9c83c3ce5a44" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateDomain_b4a12daa-2dd6-4e24-b09e-43e80015e7ac" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateJuly12022OrEarlierMember_16fce63e-098c-4c8c-ab20-73771ba6bbab" xlink:href="mic-20211231.xsd#mic_CompletionDateJuly12022OrEarlierMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateDomain_b4a12daa-2dd6-4e24-b09e-43e80015e7ac" xlink:to="loc_mic_CompletionDateJuly12022OrEarlierMember_16fce63e-098c-4c8c-ab20-73771ba6bbab" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateAfterJuly12022Member_200b50ba-e16e-4461-8ea2-c30289fca592" xlink:href="mic-20211231.xsd#mic_CompletionDateAfterJuly12022Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateDomain_b4a12daa-2dd6-4e24-b09e-43e80015e7ac" xlink:to="loc_mic_CompletionDateAfterJuly12022Member_200b50ba-e16e-4461-8ea2-c30289fca592" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_ac8377a3-4ea7-4645-a3ae-fa227132b48a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_ac8377a3-4ea7-4645-a3ae-fa227132b48a" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ac8377a3-4ea7-4645-a3ae-fa227132b48a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ac8377a3-4ea7-4645-a3ae-fa227132b48a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ac8377a3-4ea7-4645-a3ae-fa227132b48a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_23e53579-7848-48d4-8678-0ca096767b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ac8377a3-4ea7-4645-a3ae-fa227132b48a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_23e53579-7848-48d4-8678-0ca096767b4e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_e5740a52-dec1-4d7b-a4ca-2ef07fc6a9f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_23e53579-7848-48d4-8678-0ca096767b4e" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_e5740a52-dec1-4d7b-a4ca-2ef07fc6a9f7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_3c51b6aa-b470-44fa-aed7-06dd60d0c229" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_23e53579-7848-48d4-8678-0ca096767b4e" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_3c51b6aa-b470-44fa-aed7-06dd60d0c229" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c00201e2-535c-4293-be8f-a26305ae449e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_2083d12d-4428-4bd3-a14a-3a0ecfbf8dea" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c00201e2-535c-4293-be8f-a26305ae449e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MICHawaiiHoldingsLLCMember_6e050b80-2713-4869-9cd5-d845c6ace8e6" xlink:href="mic-20211231.xsd#mic_MICHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c00201e2-535c-4293-be8f-a26305ae449e" xlink:to="loc_mic_MICHawaiiHoldingsLLCMember_6e050b80-2713-4869-9cd5-d845c6ace8e6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationBusinessMember_dc674d2c-ce74-49a3-83f0-dc7c8052f793" xlink:href="mic-20211231.xsd#mic_AtlanticAviationBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c00201e2-535c-4293-be8f-a26305ae449e" xlink:to="loc_mic_AtlanticAviationBusinessMember_dc674d2c-ce74-49a3-83f0-dc7c8052f793" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_66e882ff-0ca0-4c9b-915b-db0b5f29777f" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_dei_LegalEntityAxis_66e882ff-0ca0-4c9b-915b-db0b5f29777f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_66e882ff-0ca0-4c9b-915b-db0b5f29777f_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_66e882ff-0ca0-4c9b-915b-db0b5f29777f" xlink:to="loc_dei_EntityDomain_66e882ff-0ca0-4c9b-915b-db0b5f29777f_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_59e9c500-8d0b-4ec6-b259-d756efc2053e" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_66e882ff-0ca0-4c9b-915b-db0b5f29777f" xlink:to="loc_dei_EntityDomain_59e9c500-8d0b-4ec6-b259-d756efc2053e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AMFHawaiiHoldingsLLCMember_0d10c3ad-249e-43a5-b41c-b2e3c00d35e4" xlink:href="mic-20211231.xsd#mic_AMFHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_59e9c500-8d0b-4ec6-b259-d756efc2053e" xlink:to="loc_mic_AMFHawaiiHoldingsLLCMember_0d10c3ad-249e-43a5-b41c-b2e3c00d35e4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BusinessAcquisitionForecastedCompletionDateAxis_93bcd2fb-9b65-4e0d-969b-2557721426c9" xlink:href="mic-20211231.xsd#mic_BusinessAcquisitionForecastedCompletionDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_mic_BusinessAcquisitionForecastedCompletionDateAxis_93bcd2fb-9b65-4e0d-969b-2557721426c9" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_93bcd2fb-9b65-4e0d-969b-2557721426c9_default" xlink:href="mic-20211231.xsd#mic_BusinessAcquisitionForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mic_BusinessAcquisitionForecastedCompletionDateAxis_93bcd2fb-9b65-4e0d-969b-2557721426c9" xlink:to="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_93bcd2fb-9b65-4e0d-969b-2557721426c9_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_3b49c7b4-4765-4de8-b101-db8f9873c9eb" xlink:href="mic-20211231.xsd#mic_BusinessAcquisitionForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mic_BusinessAcquisitionForecastedCompletionDateAxis_93bcd2fb-9b65-4e0d-969b-2557721426c9" xlink:to="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_3b49c7b4-4765-4de8-b101-db8f9873c9eb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateJuly12022OrEarlierMember_6124800a-f6d7-4cbb-b871-1bcf95566fce" xlink:href="mic-20211231.xsd#mic_CompletionDateJuly12022OrEarlierMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_3b49c7b4-4765-4de8-b101-db8f9873c9eb" xlink:to="loc_mic_CompletionDateJuly12022OrEarlierMember_6124800a-f6d7-4cbb-b871-1bcf95566fce" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateAfterJuly12022Member_bceefb2b-6ae8-4a07-b89d-4f70de8a2d7b" xlink:href="mic-20211231.xsd#mic_CompletionDateAfterJuly12022Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_BusinessAcquisitionForecastedCompletionDateDomain_3b49c7b4-4765-4de8-b101-db8f9873c9eb" xlink:to="loc_mic_CompletionDateAfterJuly12022Member_bceefb2b-6ae8-4a07-b89d-4f70de8a2d7b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_64be2dc7-15b4-4246-bcab-0453808f51c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_814956df-ded9-4057-83cf-2207c556a21c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_64be2dc7-15b4-4246-bcab-0453808f51c3" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_64be2dc7-15b4-4246-bcab-0453808f51c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_64be2dc7-15b4-4246-bcab-0453808f51c3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_64be2dc7-15b4-4246-bcab-0453808f51c3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40e1e423-8571-44cd-9085-d9b8b19ef723" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_64be2dc7-15b4-4246-bcab-0453808f51c3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40e1e423-8571-44cd-9085-d9b8b19ef723" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MICHawaiiHoldingsLLCMember_772974ed-7411-45f2-9b37-4479928af04e" xlink:href="mic-20211231.xsd#mic_MICHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40e1e423-8571-44cd-9085-d9b8b19ef723" xlink:to="loc_mic_MICHawaiiHoldingsLLCMember_772974ed-7411-45f2-9b37-4479928af04e" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#SummaryofSignificantAccountingPoliciesDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="extended" id="i046a22204fe844b1985c28f9cd3d50bf_SummaryofSignificantAccountingPoliciesDetails">
<link:loc xlink:type="locator" xlink:label="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:href="mic-20211231.xsd#mic_SignificantAccountingPoliciesLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperAtCarryingValue_67d44c6e-6bf8-47ba-877a-9e0561b7c278" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommercialPaperAtCarryingValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_CommercialPaperAtCarryingValue_67d44c6e-6bf8-47ba-877a-9e0561b7c278" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoods_4a2bdc50-f308-4e16-a37d-ad9f235a51a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryFinishedGoods"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_InventoryFinishedGoods_4a2bdc50-f308-4e16-a37d-ad9f235a51a6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves_a344b0d4-1fe2-4e24-9517-8f4ce79ade30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves_a344b0d4-1fe2-4e24-9517-8f4ce79ade30" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_6bff5512-21d2-4865-827d-31e21b48a587" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_6bff5512-21d2-4865-827d-31e21b48a587" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_199c05ec-9d6e-4dfd-8fa0-4fccfe743994" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_199c05ec-9d6e-4dfd-8fa0-4fccfe743994" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtIssuanceCostsAmortizationPeriod_6e7e5de8-6225-4e44-a608-3c520e174ae3" xlink:href="mic-20211231.xsd#mic_DebtIssuanceCostsAmortizationPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_mic_DebtIssuanceCostsAmortizationPeriod_6e7e5de8-6225-4e44-a608-3c520e174ae3" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts_f5400a85-0db0-4039-baaf-49001c9c01f2" xlink:href="mic-20211231.xsd#mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts_f5400a85-0db0-4039-baaf-49001c9c01f2" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_26759074-e0ba-405c-9e32-2d6d4890ff53" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_26759074-e0ba-405c-9e32-2d6d4890ff53" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageOfOwnedSubsidiaries_af7e3ad8-09ce-4f8a-8ad0-6d39fcfbd6a4" xlink:href="mic-20211231.xsd#mic_PercentageOfOwnedSubsidiaries"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_mic_PercentageOfOwnedSubsidiaries_af7e3ad8-09ce-4f8a-8ad0-6d39fcfbd6a4" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:href="mic-20211231.xsd#mic_SignificantAccountingPoliciesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mic_SignificantAccountingPoliciesLineItems_d3a26268-ed3b-4bcf-b31c-1cb160d6ce32" xlink:to="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_cd3a3645-e934-42cf-94db-7782a21c5e53" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_cd3a3645-e934-42cf-94db-7782a21c5e53" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cd3a3645-e934-42cf-94db-7782a21c5e53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_cd3a3645-e934-42cf-94db-7782a21c5e53" xlink:to="loc_us-gaap_SegmentDomain_cd3a3645-e934-42cf-94db-7782a21c5e53_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6029628b-110b-42f2-8060-f2801f0d03dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_cd3a3645-e934-42cf-94db-7782a21c5e53" xlink:to="loc_us-gaap_SegmentDomain_6029628b-110b-42f2-8060-f2801f0d03dd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_b21987c4-e6ad-4cb9-b4e2-855dae3a788b" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6029628b-110b-42f2-8060-f2801f0d03dd" xlink:to="loc_mic_HawaiiGasBusinessMember_b21987c4-e6ad-4cb9-b4e2-855dae3a788b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e5d7f901-515a-4699-834c-478e416f4d44" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:to="loc_srt_RangeAxis_e5d7f901-515a-4699-834c-478e416f4d44" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e5d7f901-515a-4699-834c-478e416f4d44_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e5d7f901-515a-4699-834c-478e416f4d44" xlink:to="loc_srt_RangeMember_e5d7f901-515a-4699-834c-478e416f4d44_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_060a15b2-7458-4c6e-ada7-5e6d04db0637" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e5d7f901-515a-4699-834c-478e416f4d44" xlink:to="loc_srt_RangeMember_060a15b2-7458-4c6e-ada7-5e6d04db0637" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fc7af7a6-1b76-4f00-a555-5e93a65f63a3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_060a15b2-7458-4c6e-ada7-5e6d04db0637" xlink:to="loc_srt_MinimumMember_fc7af7a6-1b76-4f00-a555-5e93a65f63a3" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a0bd8a61-87ef-421d-87dc-298ca45407ba" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_060a15b2-7458-4c6e-ada7-5e6d04db0637" xlink:to="loc_srt_MaximumMember_a0bd8a61-87ef-421d-87dc-298ca45407ba" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1fb7e44e-3708-4ad0-8940-914523498ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1fb7e44e-3708-4ad0-8940-914523498ea4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1fb7e44e-3708-4ad0-8940-914523498ea4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1fb7e44e-3708-4ad0-8940-914523498ea4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1fb7e44e-3708-4ad0-8940-914523498ea4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1fb7e44e-3708-4ad0-8940-914523498ea4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_ca063535-c3ed-44d4-88af-554df349364a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:to="loc_us-gaap_BuildingMember_ca063535-c3ed-44d4-88af-554df349364a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_fa2bde3d-6e25-4daf-8fe9-75804fd8a88d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_fa2bde3d-6e25-4daf-8fe9-75804fd8a88d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_47d7e207-ee7a-4efb-9163-9b9f4cdd1315" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_47d7e207-ee7a-4efb-9163-9b9f4cdd1315" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_95b11bf8-ac77-4415-87fa-b183e7bc60d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdsAndLeaseholdImprovementsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f3622e34-2a78-406f-a733-41b4af28a6fa" xlink:to="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_95b11bf8-ac77-4415-87fa-b183e7bc60d9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_1e2c5844-38d6-49e0-b97b-7724d7699cdd" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_SignificantAccountingPoliciesTable_d7463049-f031-4f17-a8f7-c885059fa465" xlink:to="loc_dei_LegalEntityAxis_1e2c5844-38d6-49e0-b97b-7724d7699cdd" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1e2c5844-38d6-49e0-b97b-7724d7699cdd_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_1e2c5844-38d6-49e0-b97b-7724d7699cdd" xlink:to="loc_dei_EntityDomain_1e2c5844-38d6-49e0-b97b-7724d7699cdd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_de3ccbc0-9e40-46c6-aa03-13e656f39c79" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_1e2c5844-38d6-49e0-b97b-7724d7699cdd" xlink:to="loc_dei_EntityDomain_de3ccbc0-9e40-46c6-aa03-13e656f39c79" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_IntermediateHoldingCompanyMember_49f434f0-816b-43b0-ba12-9cb1dc0166ab" xlink:href="mic-20211231.xsd#mic_IntermediateHoldingCompanyMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_de3ccbc0-9e40-46c6-aa03-13e656f39c79" xlink:to="loc_mic_IntermediateHoldingCompanyMember_49f434f0-816b-43b0-ba12-9cb1dc0166ab" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/ImpactofCOVID19Details" xlink:type="simple" xlink:href="mic-20211231.xsd#ImpactofCOVID19Details"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/ImpactofCOVID19Details" xlink:type="extended" id="i8dcca4752b9a4ebf8f6805ebf6a737c8_ImpactofCOVID19Details">
<link:loc xlink:type="locator" xlink:label="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:href="mic-20211231.xsd#mic_ImpactofCOVID19LineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfVisitorArrivalsToHawaiiDuringPeriod_609a51e6-36be-4f5e-a080-b79100eebb36" xlink:href="mic-20211231.xsd#mic_NumberOfVisitorArrivalsToHawaiiDuringPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:to="loc_mic_NumberOfVisitorArrivalsToHawaiiDuringPeriod_609a51e6-36be-4f5e-a080-b79100eebb36" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageMovementOfGasSoldForQuarterPeriodOneYearPriorCurrentPeriod_31c925e6-c804-4264-afb6-92414e1bd37c" xlink:href="mic-20211231.xsd#mic_PercentageMovementOfGasSoldForQuarterPeriodOneYearPriorCurrentPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:to="loc_mic_PercentageMovementOfGasSoldForQuarterPeriodOneYearPriorCurrentPeriod_31c925e6-c804-4264-afb6-92414e1bd37c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageMovementOfNumberOfVisitorArrivalsToHawaiiForPeriodTwoYearsPriorCurrentPeriod_9f63ac24-28e1-4ddf-b80f-952274788137" xlink:href="mic-20211231.xsd#mic_PercentageMovementOfNumberOfVisitorArrivalsToHawaiiForPeriodTwoYearsPriorCurrentPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:to="loc_mic_PercentageMovementOfNumberOfVisitorArrivalsToHawaiiForPeriodTwoYearsPriorCurrentPeriod_9f63ac24-28e1-4ddf-b80f-952274788137" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageMovementOfGasSoldForQuarterPeriodTwoYearsPriorCurrentPeriod_a023613e-c4f3-48df-b6ed-6ae5e915c5ee" xlink:href="mic-20211231.xsd#mic_PercentageMovementOfGasSoldForQuarterPeriodTwoYearsPriorCurrentPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:to="loc_mic_PercentageMovementOfGasSoldForQuarterPeriodTwoYearsPriorCurrentPeriod_a023613e-c4f3-48df-b6ed-6ae5e915c5ee" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImpactofCOVID19Table_a7b49bd5-eade-4d36-9414-cc43435ef677" xlink:href="mic-20211231.xsd#mic_ImpactofCOVID19Table"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mic_ImpactofCOVID19LineItems_d0ee58fe-7ea2-46a7-9468-541a6b905651" xlink:to="loc_mic_ImpactofCOVID19Table_a7b49bd5-eade-4d36-9414-cc43435ef677" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_89020d86-cac0-43a2-a03b-f6007b38db44" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_ImpactofCOVID19Table_a7b49bd5-eade-4d36-9414-cc43435ef677" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_89020d86-cac0-43a2-a03b-f6007b38db44" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_89020d86-cac0-43a2-a03b-f6007b38db44_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_89020d86-cac0-43a2-a03b-f6007b38db44" xlink:to="loc_us-gaap_SegmentDomain_89020d86-cac0-43a2-a03b-f6007b38db44_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_16d17c4d-265e-432b-841e-ea87eeb93e58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_89020d86-cac0-43a2-a03b-f6007b38db44" xlink:to="loc_us-gaap_SegmentDomain_16d17c4d-265e-432b-841e-ea87eeb93e58" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_7a2b8a96-101c-43b3-9f09-84a3e6293b1b" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_16d17c4d-265e-432b-841e-ea87eeb93e58" xlink:to="loc_mic_HawaiiGasBusinessMember_7a2b8a96-101c-43b3-9f09-84a3e6293b1b" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#DiscontinuedOperationsandDispositionsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsNarrativeDetails" xlink:type="extended" id="i8da49b9964bb4f22861bcf884723e59a_DiscontinuedOperationsandDispositionsNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_41921a70-4148-4824-b53e-f3b74c45e0b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_41921a70-4148-4824-b53e-f3b74c45e0b6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_4315a601-6cc7-45a6-8ebe-762925bc24bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_4315a601-6cc7-45a6-8ebe-762925bc24bd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_5ad10b6c-3c22-4877-bfa5-1bc2e0147a3e" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_5ad10b6c-3c22-4877-bfa5-1bc2e0147a3e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialDividendPerUnit_dfcec606-f306-4838-b013-3a72be0931f6" xlink:href="mic-20211231.xsd#mic_SpecialDividendPerUnit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_SpecialDividendPerUnit_dfcec606-f306-4838-b013-3a72be0931f6" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_69e89192-0368-45b0-9082-0a8ca020a981" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_69e89192-0368-45b0-9082-0a8ca020a981" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TransactionCostsOnBusinessDisposal_25ce22f7-5c43-4fd0-b1d0-263698d21376" xlink:href="mic-20211231.xsd#mic_TransactionCostsOnBusinessDisposal"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_TransactionCostsOnBusinessDisposal_25ce22f7-5c43-4fd0-b1d0-263698d21376" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PurchasePriceOfBusinessSoldGross_5417a901-faf9-414f-8b67-ebfdce4f36c5" xlink:href="mic-20211231.xsd#mic_PurchasePriceOfBusinessSoldGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_PurchasePriceOfBusinessSoldGross_5417a901-faf9-414f-8b67-ebfdce4f36c5" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtOutstandingAndCashIncludedInConsideration_8322590d-ffa6-4092-b094-2c749a8b3683" xlink:href="mic-20211231.xsd#mic_DebtOutstandingAndCashIncludedInConsideration"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_DebtOutstandingAndCashIncludedInConsideration_8322590d-ffa6-4092-b094-2c749a8b3683" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ProceedsFromDivestitureOfBusinessNet_a97334e9-ebf0-45e4-879c-73187c7c2cf7" xlink:href="mic-20211231.xsd#mic_ProceedsFromDivestitureOfBusinessNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_ProceedsFromDivestitureOfBusinessNet_a97334e9-ebf0-45e4-879c-73187c7c2cf7" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_28737d61-84cb-485b-a23a-da8d64f03ed4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_28737d61-84cb-485b-a23a-da8d64f03ed4" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImpairmentOnDisposalGroup_ee215a09-07cd-4a70-9beb-2fa532d91b30" xlink:href="mic-20211231.xsd#mic_ImpairmentOnDisposalGroup"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_ImpairmentOnDisposalGroup_ee215a09-07cd-4a70-9beb-2fa532d91b30" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_d6ff31bb-9f8c-4715-b1a3-02726bc99ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_d6ff31bb-9f8c-4715-b1a3-02726bc99ab8" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DeferredTaxLiabilityDueToBookVsTaxBasis_0214dac4-2009-4c55-affa-8934ab12aff8" xlink:href="mic-20211231.xsd#mic_DeferredTaxLiabilityDueToBookVsTaxBasis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_DeferredTaxLiabilityDueToBookVsTaxBasis_0214dac4-2009-4c55-affa-8934ab12aff8" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxesPayable_5a3b6f30-b93b-4605-91ba-f69a423b1f27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxesPayable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxesPayable_5a3b6f30-b93b-4605-91ba-f69a423b1f27" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CapacityOfPlant_23b788c9-3d0d-4831-8962-ae68c5418ef4" xlink:href="mic-20211231.xsd#mic_CapacityOfPlant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_CapacityOfPlant_23b788c9-3d0d-4831-8962-ae68c5418ef4" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtAssumedByBuyerFromDivestitureOfBusiness_e638d91f-5734-4e86-beb1-514242cb9637" xlink:href="mic-20211231.xsd#mic_DebtAssumedByBuyerFromDivestitureOfBusiness"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_DebtAssumedByBuyerFromDivestitureOfBusiness_e638d91f-5734-4e86-beb1-514242cb9637" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PurchasePriceOfBusinessSoldGross_2288b129-58cb-478f-95d2-e924f9a18236" xlink:href="mic-20211231.xsd#mic_PurchasePriceOfBusinessSoldGross"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CashConsiderationFromDivestitureOfBusinessesNetOfTransactionCostsAndTaxes_5b771e4e-2507-42a8-a622-9c314a6cf1c0" xlink:href="mic-20211231.xsd#mic_CashConsiderationFromDivestitureOfBusinessesNetOfTransactionCostsAndTaxes"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_mic_CashConsiderationFromDivestitureOfBusinessesNetOfTransactionCostsAndTaxes_5b771e4e-2507-42a8-a622-9c314a6cf1c0" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TransactionCostsOnBusinessDisposal_e9a2d153-e052-4326-8873-47a1433d24b2" xlink:href="mic-20211231.xsd#mic_TransactionCostsOnBusinessDisposal"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxesPayable_dfc3a1ca-54f7-4836-a892-b55593eda5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedIncomeTaxesPayable"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_234221f8-d905-4908-89f0-03e807e6fca4" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3c22fac9-345e-4e6b-b59f-6828a1cbd84a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3c22fac9-345e-4e6b-b59f-6828a1cbd84a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_3c22fac9-345e-4e6b-b59f-6828a1cbd84a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3c22fac9-345e-4e6b-b59f-6828a1cbd84a" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_3c22fac9-345e-4e6b-b59f-6828a1cbd84a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0e065608-a663-4b8d-9d0c-1f02557845b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3c22fac9-345e-4e6b-b59f-6828a1cbd84a" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0e065608-a663-4b8d-9d0c-1f02557845b6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationBusinessMember_5215fbd8-4fdb-4c35-a5ab-0de84ebdbd72" xlink:href="mic-20211231.xsd#mic_AtlanticAviationBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0e065608-a663-4b8d-9d0c-1f02557845b6" xlink:to="loc_mic_AtlanticAviationBusinessMember_5215fbd8-4fdb-4c35-a5ab-0de84ebdbd72" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImttMember_b252d26d-4902-4c90-ad3b-4c7214fd8e56" xlink:href="mic-20211231.xsd#mic_ImttMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0e065608-a663-4b8d-9d0c-1f02557845b6" xlink:to="loc_mic_ImttMember_b252d26d-4902-4c90-ad3b-4c7214fd8e56" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_3d6324d4-e502-4a07-bc23-ae1489adc571" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_3d6324d4-e502-4a07-bc23-ae1489adc571" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3d6324d4-e502-4a07-bc23-ae1489adc571_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_3d6324d4-e502-4a07-bc23-ae1489adc571" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3d6324d4-e502-4a07-bc23-ae1489adc571_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_6f885970-df57-44da-acba-a1c3c3837748" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_3d6324d4-e502-4a07-bc23-ae1489adc571" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_6f885970-df57-44da-acba-a1c3c3837748" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_0eaeab12-30e3-4058-9999-2a92cfde28a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_6f885970-df57-44da-acba-a1c3c3837748" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_0eaeab12-30e3-4058-9999-2a92cfde28a2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_134f9c05-3ab5-4542-afdf-9f0b08779e16" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_134f9c05-3ab5-4542-afdf-9f0b08779e16" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_134f9c05-3ab5-4542-afdf-9f0b08779e16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_134f9c05-3ab5-4542-afdf-9f0b08779e16" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_134f9c05-3ab5-4542-afdf-9f0b08779e16_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e740761b-1712-48bb-8960-b1064aeda533" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_134f9c05-3ab5-4542-afdf-9f0b08779e16" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e740761b-1712-48bb-8960-b1064aeda533" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_f8e4e394-ad1a-455a-8d69-2a6aacc28e34" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e740761b-1712-48bb-8960-b1064aeda533" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_f8e4e394-ad1a-455a-8d69-2a6aacc28e34" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4c7c91ff-e67c-4667-8625-335a77d96d21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1f071c75-01bd-4b5d-8500-f5bb3075243f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4c7c91ff-e67c-4667-8625-335a77d96d21" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4c7c91ff-e67c-4667-8625-335a77d96d21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4c7c91ff-e67c-4667-8625-335a77d96d21" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4c7c91ff-e67c-4667-8625-335a77d96d21_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f638a524-34b7-4f56-84aa-1a6e1557b8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4c7c91ff-e67c-4667-8625-335a77d96d21" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f638a524-34b7-4f56-84aa-1a6e1557b8b9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SolarGeneratingAssetsMember_5a4558cf-97c6-48b1-ac05-92efab0c584e" xlink:href="mic-20211231.xsd#mic_SolarGeneratingAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f638a524-34b7-4f56-84aa-1a6e1557b8b9" xlink:to="loc_mic_SolarGeneratingAssetsMember_5a4558cf-97c6-48b1-ac05-92efab0c584e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_WindGenerationAssetsMember_29d69c76-6f84-4aa4-aa6c-189432567dc6" xlink:href="mic-20211231.xsd#mic_WindGenerationAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f638a524-34b7-4f56-84aa-1a6e1557b8b9" xlink:to="loc_mic_WindGenerationAssetsMember_29d69c76-6f84-4aa4-aa6c-189432567dc6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SolarAndwindFacilitiesMember_2c99d3cc-c716-43d6-a934-09016f8fa4c0" xlink:href="mic-20211231.xsd#mic_SolarAndwindFacilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f638a524-34b7-4f56-84aa-1a6e1557b8b9" xlink:to="loc_mic_SolarAndwindFacilitiesMember_2c99d3cc-c716-43d6-a934-09016f8fa4c0" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsBalanceSheetDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#DiscontinuedOperationsandDispositionsBalanceSheetDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsBalanceSheetDetails" xlink:type="extended" id="i15acec0c8fe94285a5dfb7e19f3e4d83_DiscontinuedOperationsandDispositionsBalanceSheetDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2493a38a-2c23-49ab-bf6c-ee09b7eff8f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2493a38a-2c23-49ab-bf6c-ee09b7eff8f3" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_40a2b314-04b9-444d-b136-67819d6e8fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents_40a2b314-04b9-444d-b136-67819d6e8fdb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationRestrictedCash_ba7ade70-6e29-499d-9751-f7e403e4efd1" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationRestrictedCash"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationRestrictedCash_ba7ade70-6e29-499d-9751-f7e403e4efd1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_e95bc1d9-387e-422e-addc-e21fb5d4b63c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_e95bc1d9-387e-422e-addc-e21fb5d4b63c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_fb3ec4e2-1469-4c21-84e2-7b2f6b5104ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_fb3ec4e2-1469-4c21-84e2-7b2f6b5104ad" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_69bf3eb7-cd82-4a0e-bf4e-75eba90a7b34" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_69bf3eb7-cd82-4a0e-bf4e-75eba90a7b34" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_73aa327a-70c9-40bc-a452-fea90027c532" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_73aa327a-70c9-40bc-a452-fea90027c532" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAsset_4e6e58fa-39c7-4423-b72a-273ed16f807a" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAsset"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAsset_4e6e58fa-39c7-4423-b72a-273ed16f807a" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent_194d49d4-d37a-4ec4-bbcf-b620e53f7645" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwillNoncurrent_194d49d4-d37a-4ec4-bbcf-b620e53f7645" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent_49daf318-9c69-42bd-9023-6b78c93e0f97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent_49daf318-9c69-42bd-9023-6b78c93e0f97" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_56971e07-ce60-462f-be00-f9fc359ca120" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_56971e07-ce60-462f-be00-f9fc359ca120" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_2b832f69-d09b-4022-89b4-521d0d645e98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract_b47c4f19-62e3-44d6-9bfb-f54e224f53fd" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_2b832f69-d09b-4022-89b4-521d0d645e98" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2493a38a-2c23-49ab-bf6c-ee09b7eff8f3" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent_d61e094f-a04c-4a01-8aa2-8b4638588eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent_d61e094f-a04c-4a01-8aa2-8b4638588eb1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrentMaturities_8cc12c50-e48c-462e-8601-d32d48fe51e9" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrentMaturities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrentMaturities_8cc12c50-e48c-462e-8601-d32d48fe51e9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent_041b1348-dd41-439b-a9e9-0f9a45555a0e" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent_041b1348-dd41-439b-a9e9-0f9a45555a0e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationTaxesPayableCurrent_648cd8b5-b196-40e3-83cf-cd11ee11d812" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationTaxesPayableCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationTaxesPayableCurrent_648cd8b5-b196-40e3-83cf-cd11ee11d812" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_c24823b3-ca76-40cd-823a-e04ac4c51be3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_c24823b3-ca76-40cd-823a-e04ac4c51be3" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_2a878ffd-50fe-4f56-b966-97abc74bc6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_2a878ffd-50fe-4f56-b966-97abc74bc6d9" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtExcludingCurrentMaturities_79375978-0d5b-487f-8fd3-48cc4a34c80a" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtExcludingCurrentMaturities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationLongTermDebtExcludingCurrentMaturities_79375978-0d5b-487f-8fd3-48cc4a34c80a" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities_7a341a7e-6b73-4f09-a8c4-529436df3a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities_7a341a7e-6b73-4f09-a8c4-529436df3a0d" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityNoncurrent_c25c9d08-5e49-4ebf-bbcb-bb0ffe0e91c8" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityNoncurrent_c25c9d08-5e49-4ebf-bbcb-bb0ffe0e91c8" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_ceb7c3cd-16ab-40c9-9492-3910695cebfd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_ceb7c3cd-16ab-40c9-9492-3910695cebfd" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_203217e1-f512-4611-b04a-ddb298d373f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract_e57f20d4-3c23-4ccc-950a-4d6f10b4d47f" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_203217e1-f512-4611-b04a-ddb298d373f5" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9953a430-2648-4a8f-a374-0a68d5ca11cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_2493a38a-2c23-49ab-bf6c-ee09b7eff8f3" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9953a430-2648-4a8f-a374-0a68d5ca11cb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_84c50171-8f11-4c12-b5bc-710a1f5dd699" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9953a430-2648-4a8f-a374-0a68d5ca11cb" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_84c50171-8f11-4c12-b5bc-710a1f5dd699" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_84c50171-8f11-4c12-b5bc-710a1f5dd699_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_84c50171-8f11-4c12-b5bc-710a1f5dd699" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_84c50171-8f11-4c12-b5bc-710a1f5dd699_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d667c184-1338-4e16-b85a-e56de3c4c0cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_84c50171-8f11-4c12-b5bc-710a1f5dd699" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d667c184-1338-4e16-b85a-e56de3c4c0cc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationBusinessMember_a86c1bd4-488b-49ca-bfac-f5cd23140a7f" xlink:href="mic-20211231.xsd#mic_AtlanticAviationBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d667c184-1338-4e16-b85a-e56de3c4c0cc" xlink:to="loc_mic_AtlanticAviationBusinessMember_a86c1bd4-488b-49ca-bfac-f5cd23140a7f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_cea85262-0618-4d3a-b475-b3c90fccac58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9953a430-2648-4a8f-a374-0a68d5ca11cb" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_cea85262-0618-4d3a-b475-b3c90fccac58" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_cea85262-0618-4d3a-b475-b3c90fccac58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_cea85262-0618-4d3a-b475-b3c90fccac58" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_cea85262-0618-4d3a-b475-b3c90fccac58_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_5bb9f136-e227-422f-9f11-3727309a6338" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_cea85262-0618-4d3a-b475-b3c90fccac58" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_5bb9f136-e227-422f-9f11-3727309a6338" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_43b52214-a678-4eb4-a279-d3e1ef85ed57" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_5bb9f136-e227-422f-9f11-3727309a6338" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_43b52214-a678-4eb4-a279-d3e1ef85ed57" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsStatementofOperationsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#DiscontinuedOperationsandDispositionsStatementofOperationsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/DiscontinuedOperationsandDispositionsStatementofOperationsDetails" xlink:type="extended" id="ide691868153a446ab3fb7da94b9797b1_DiscontinuedOperationsandDispositionsStatementofOperationsDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_259e5c67-16a1-4b45-b1d8-7521373a909c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_259e5c67-16a1-4b45-b1d8-7521373a909c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_d7700d88-05b1-4ba0-ae1d-d66b5f92c2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_d7700d88-05b1-4ba0-ae1d-d66b5f92c2dc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_ac340b20-83c7-4694-b8ac-54aef6d670df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_ac340b20-83c7-4694-b8ac-54aef6d670df" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImpairmentOnDisposalGroup_512579a2-d6a1-4c13-bc75-743e8317e569" xlink:href="mic-20211231.xsd#mic_ImpairmentOnDisposalGroup"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_mic_ImpairmentOnDisposalGroup_512579a2-d6a1-4c13-bc75-743e8317e569" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_f2c48712-9a3f-42e8-a214-01ffb7b968bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_f2c48712-9a3f-42e8-a214-01ffb7b968bb" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_7a0c80d6-b087-476f-88ca-91a682354c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense_7a0c80d6-b087-476f-88ca-91a682354c9e" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_8a04f228-1489-46fb-82e1-300812d0d563" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_8a04f228-1489-46fb-82e1-300812d0d563" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome_b7de12bf-6544-4d7e-a266-bc1c7fdd6ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome_b7de12bf-6544-4d7e-a266-bc1c7fdd6ba5" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_19f01bd9-40af-404d-9276-e5bd9041c745" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_19f01bd9-40af-404d-9276-e5bd9041c745" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_2ecbf971-6b95-4594-ad16-fb6fc2c92cda" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_2ecbf971-6b95-4594-ad16-fb6fc2c92cda" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_bd5cd294-e2b4-418c-949f-1ce8cd20d239" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_bd5cd294-e2b4-418c-949f-1ce8cd20d239" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_14affd8b-5a4e-4ad5-bba9-3dc6e886808d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_14affd8b-5a4e-4ad5-bba9-3dc6e886808d" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest_774ace7b-d192-4fd8-b617-85b947a7eeb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest_774ace7b-d192-4fd8-b617-85b947a7eeb5" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_d336fe57-9eab-430a-8c42-cecc882459ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_d336fe57-9eab-430a-8c42-cecc882459ee" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_ae45f742-3e98-44aa-aaa6-667bbe9aa29b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_ae45f742-3e98-44aa-aaa6-667bbe9aa29b" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1675024-dd68-49da-a945-106f4c595e60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7103f02d-07fb-4c74-a8ea-b9d86d843ec3" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1675024-dd68-49da-a945-106f4c595e60" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_aa0362e8-1183-4ab3-9375-d23f15958333" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1675024-dd68-49da-a945-106f4c595e60" xlink:to="loc_srt_ProductOrServiceAxis_aa0362e8-1183-4ab3-9375-d23f15958333" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_aa0362e8-1183-4ab3-9375-d23f15958333_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_aa0362e8-1183-4ab3-9375-d23f15958333" xlink:to="loc_srt_ProductsAndServicesDomain_aa0362e8-1183-4ab3-9375-d23f15958333_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e397c330-41c4-4325-8f55-cf769beb2747" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_aa0362e8-1183-4ab3-9375-d23f15958333" xlink:to="loc_srt_ProductsAndServicesDomain_e397c330-41c4-4325-8f55-cf769beb2747" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_1c7d4e5f-33e7-44be-b46e-571015057cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ServiceMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e397c330-41c4-4325-8f55-cf769beb2747" xlink:to="loc_us-gaap_ServiceMember_1c7d4e5f-33e7-44be-b46e-571015057cd0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_08dde73e-c99e-4390-a75a-41711684e5ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e397c330-41c4-4325-8f55-cf769beb2747" xlink:to="loc_us-gaap_ProductMember_08dde73e-c99e-4390-a75a-41711684e5ae" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_aea6096c-f205-4ca4-9127-e881cf95112d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1675024-dd68-49da-a945-106f4c595e60" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_aea6096c-f205-4ca4-9127-e881cf95112d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_aea6096c-f205-4ca4-9127-e881cf95112d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_aea6096c-f205-4ca4-9127-e881cf95112d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_aea6096c-f205-4ca4-9127-e881cf95112d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d9f8960f-ce25-4972-96a3-8fa0b7eaa738" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_aea6096c-f205-4ca4-9127-e881cf95112d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d9f8960f-ce25-4972-96a3-8fa0b7eaa738" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationBusinessMember_3fd19955-5e29-4465-9b0d-36c7d7de6699" xlink:href="mic-20211231.xsd#mic_AtlanticAviationBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d9f8960f-ce25-4972-96a3-8fa0b7eaa738" xlink:to="loc_mic_AtlanticAviationBusinessMember_3fd19955-5e29-4465-9b0d-36c7d7de6699" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImttMember_e907de74-0c51-4956-9155-f604fabdf5e2" xlink:href="mic-20211231.xsd#mic_ImttMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d9f8960f-ce25-4972-96a3-8fa0b7eaa738" xlink:to="loc_mic_ImttMember_e907de74-0c51-4956-9155-f604fabdf5e2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BayonneEnergyCenterMember_8a087328-ada1-42ec-be5f-c21268284b65" xlink:href="mic-20211231.xsd#mic_BayonneEnergyCenterMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d9f8960f-ce25-4972-96a3-8fa0b7eaa738" xlink:to="loc_mic_BayonneEnergyCenterMember_8a087328-ada1-42ec-be5f-c21268284b65" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_dcde60f5-e027-4d55-9269-90a26566284a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_f1675024-dd68-49da-a945-106f4c595e60" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_dcde60f5-e027-4d55-9269-90a26566284a" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_dcde60f5-e027-4d55-9269-90a26566284a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_dcde60f5-e027-4d55-9269-90a26566284a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_dcde60f5-e027-4d55-9269-90a26566284a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_79c1786a-12bb-45b5-ab8a-07879ca92a8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_dcde60f5-e027-4d55-9269-90a26566284a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_79c1786a-12bb-45b5-ab8a-07879ca92a8d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_6437b7ae-a7de-4fab-b750-ff14ab62cbe3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_79c1786a-12bb-45b5-ab8a-07879ca92a8d" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_6437b7ae-a7de-4fab-b750-ff14ab62cbe3" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LeasesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LeasesNarrativeDetails" xlink:type="extended" id="i9ffd8acf615742228b0ed9b10b5ed57b_LeasesNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_c36d18aa-988b-46c0-87f6-fe259f711b39" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_c36d18aa-988b-46c0-87f6-fe259f711b39" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LesseeOperatingLeaseNumberOfRenewalOptions_cae6f83c-7267-470f-84a8-3c995ab693e0" xlink:href="mic-20211231.xsd#mic_LesseeOperatingLeaseNumberOfRenewalOptions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_mic_LesseeOperatingLeaseNumberOfRenewalOptions_cae6f83c-7267-470f-84a8-3c995ab693e0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_5dc9bc09-ba73-401f-852b-cb8002a48243" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_5dc9bc09-ba73-401f-852b-cb8002a48243" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_7f615d10-38b5-4ece-981c-2996b59e5329" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_7f615d10-38b5-4ece-981c-2996b59e5329" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseDiscountRate_9e44b8e3-c875-4f91-ac15-63b530913bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseDiscountRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_us-gaap_LesseeOperatingLeaseDiscountRate_9e44b8e3-c875-4f91-ac15-63b530913bc0" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_0af40c5c-8d92-4a61-8a68-5f017ca59e64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_ba7c5f93-3d5f-4d24-ab63-0e6f709a8226" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_0af40c5c-8d92-4a61-8a68-5f017ca59e64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8911aa33-1d31-4289-8770-2378f81b3a55" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_0af40c5c-8d92-4a61-8a68-5f017ca59e64" xlink:to="loc_srt_RangeAxis_8911aa33-1d31-4289-8770-2378f81b3a55" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8911aa33-1d31-4289-8770-2378f81b3a55_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_8911aa33-1d31-4289-8770-2378f81b3a55" xlink:to="loc_srt_RangeMember_8911aa33-1d31-4289-8770-2378f81b3a55_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_83e6c8b8-d0bb-446b-a824-a55118c3b128" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_8911aa33-1d31-4289-8770-2378f81b3a55" xlink:to="loc_srt_RangeMember_83e6c8b8-d0bb-446b-a824-a55118c3b128" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2490983e-9f60-4e87-90a8-ca4cf6604ae5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_83e6c8b8-d0bb-446b-a824-a55118c3b128" xlink:to="loc_srt_MinimumMember_2490983e-9f60-4e87-90a8-ca4cf6604ae5" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_15619dd8-334f-4cff-9aa9-bc1385ed3dfc" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_83e6c8b8-d0bb-446b-a824-a55118c3b128" xlink:to="loc_srt_MaximumMember_15619dd8-334f-4cff-9aa9-bc1385ed3dfc" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LeasesConsolidatedStatementofOperationsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LeasesConsolidatedStatementofOperationsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LeasesConsolidatedStatementofOperationsDetails" xlink:type="extended" id="if6a483ca906a4de68f0e64bee836b0a6_LeasesConsolidatedStatementofOperationsDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_cc055292-45a6-4275-bf95-0cf3742f80ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_abf7b56a-ae69-4a1c-a722-933d0a2c0231" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_cc055292-45a6-4275-bf95-0cf3742f80ae" xlink:to="loc_us-gaap_OperatingLeaseExpense_abf7b56a-ae69-4a1c-a722-933d0a2c0231" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_3b31b4b9-927f-4b35-9a24-ca9c9b61bb22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_cc055292-45a6-4275-bf95-0cf3742f80ae" xlink:to="loc_us-gaap_ShortTermLeaseCost_3b31b4b9-927f-4b35-9a24-ca9c9b61bb22" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_630ca0e3-3e64-4a2f-87d2-ba041901ceba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_cc055292-45a6-4275-bf95-0cf3742f80ae" xlink:to="loc_us-gaap_VariableLeaseCost_630ca0e3-3e64-4a2f-87d2-ba041901ceba" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_65e12fd6-8b6a-49c8-b2f7-53ab12c0d79d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_cc055292-45a6-4275-bf95-0cf3742f80ae" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_65e12fd6-8b6a-49c8-b2f7-53ab12c0d79d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c1d3de34-09de-4500-9c2c-c9a4553a2646" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_65e12fd6-8b6a-49c8-b2f7-53ab12c0d79d" xlink:to="loc_srt_ProductOrServiceAxis_c1d3de34-09de-4500-9c2c-c9a4553a2646" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c1d3de34-09de-4500-9c2c-c9a4553a2646_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c1d3de34-09de-4500-9c2c-c9a4553a2646" xlink:to="loc_srt_ProductsAndServicesDomain_c1d3de34-09de-4500-9c2c-c9a4553a2646_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_db79e2cf-b4e8-4b1e-8b38-1603fc56e43b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c1d3de34-09de-4500-9c2c-c9a4553a2646" xlink:to="loc_srt_ProductsAndServicesDomain_db79e2cf-b4e8-4b1e-8b38-1603fc56e43b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_1593128c-5176-483a-8257-35e9e4ec9b12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_db79e2cf-b4e8-4b1e-8b38-1603fc56e43b" xlink:to="loc_us-gaap_ProductMember_1593128c-5176-483a-8257-35e9e4ec9b12" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_3a310891-fc6e-4b64-a295-9dc32fb53f65" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_65e12fd6-8b6a-49c8-b2f7-53ab12c0d79d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_3a310891-fc6e-4b64-a295-9dc32fb53f65" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3a310891-fc6e-4b64-a295-9dc32fb53f65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3a310891-fc6e-4b64-a295-9dc32fb53f65" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3a310891-fc6e-4b64-a295-9dc32fb53f65_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_45c40aae-4622-483b-8d41-8f14c4c3fd9d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3a310891-fc6e-4b64-a295-9dc32fb53f65" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_45c40aae-4622-483b-8d41-8f14c4c3fd9d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_41ba958f-a59d-405f-b059-d5ea58816b37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_45c40aae-4622-483b-8d41-8f14c4c3fd9d" xlink:to="loc_us-gaap_CostOfSalesMember_41ba958f-a59d-405f-b059-d5ea58816b37" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_26e99bdd-05ce-45eb-891a-87b39bab2cdf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_45c40aae-4622-483b-8d41-8f14c4c3fd9d" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_26e99bdd-05ce-45eb-891a-87b39bab2cdf" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/IncomeperUnitScheduleofSharesExcludedfromCalculationDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#IncomeperUnitScheduleofSharesExcludedfromCalculationDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/IncomeperUnitScheduleofSharesExcludedfromCalculationDetails" xlink:type="extended" id="idc28f742495f4788b9f41ad8393276e1_IncomeperUnitScheduleofSharesExcludedfromCalculationDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_b5b9db2f-a877-4189-b264-c53f4ffad462" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3bb16be1-00c2-4222-9407-ce29f75134c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_b5b9db2f-a877-4189-b264-c53f4ffad462" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3bb16be1-00c2-4222-9407-ce29f75134c1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_79102fd7-fc36-499b-ae4f-b8e7675fd9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_b5b9db2f-a877-4189-b264-c53f4ffad462" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_79102fd7-fc36-499b-ae4f-b8e7675fd9e2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_c7fd3cbd-ba60-454c-8b89-41125a0cc8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_b5b9db2f-a877-4189-b264-c53f4ffad462" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_c7fd3cbd-ba60-454c-8b89-41125a0cc8f7" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_292395ec-d4ae-4069-a34f-32d49ea573ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_b5b9db2f-a877-4189-b264-c53f4ffad462" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_292395ec-d4ae-4069-a34f-32d49ea573ec" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3dee1fb8-7ff0-494b-956a-6dbbf2218365" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_292395ec-d4ae-4069-a34f-32d49ea573ec" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3dee1fb8-7ff0-494b-956a-6dbbf2218365" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3dee1fb8-7ff0-494b-956a-6dbbf2218365_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3dee1fb8-7ff0-494b-956a-6dbbf2218365" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3dee1fb8-7ff0-494b-956a-6dbbf2218365_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_76fc2ae8-60f4-4ed4-8ad0-92cb842c5731" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3dee1fb8-7ff0-494b-956a-6dbbf2218365" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_76fc2ae8-60f4-4ed4-8ad0-92cb842c5731" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RestrictedUnitsMember_d0cac4ff-107a-4c71-b65f-e64ceda4b4ee" xlink:href="mic-20211231.xsd#mic_RestrictedUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_76fc2ae8-60f4-4ed4-8ad0-92cb842c5731" xlink:to="loc_mic_RestrictedUnitsMember_d0cac4ff-107a-4c71-b65f-e64ceda4b4ee" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes2875Member_ccf7e1ee-c50e-44d5-9a65-982e0483c9e7" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes2875Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_76fc2ae8-60f4-4ed4-8ad0-92cb842c5731" xlink:to="loc_mic_ConvertibleSeniorNotes2875Member_ccf7e1ee-c50e-44d5-9a65-982e0483c9e7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_bc204353-aed8-4621-8216-d061f62ec733" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_76fc2ae8-60f4-4ed4-8ad0-92cb842c5731" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_bc204353-aed8-4621-8216-d061f62ec733" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_292395ec-d4ae-4069-a34f-32d49ea573ec" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_87addf94-2147-4ceb-8daa-4134116ad0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_96d66563-98fd-42aa-bf7e-cbf0bc5f0dac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_87addf94-2147-4ceb-8daa-4134116ad0a9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_ffc1567e-ae71-4ddb-871e-3b590f148ef2" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_87addf94-2147-4ceb-8daa-4134116ad0a9" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_ffc1567e-ae71-4ddb-871e-3b590f148ef2" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/PropertyEquipmentLandandLeaseholdImprovementsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#PropertyEquipmentLandandLeaseholdImprovementsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/PropertyEquipmentLandandLeaseholdImprovementsDetails" xlink:type="extended" id="i4abcb2b80a34455e8ca2e48bc2c20206_PropertyEquipmentLandandLeaseholdImprovementsDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e17806e9-c78b-41b6-b2d5-7ba0e6461870" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_2e233f64-b57a-4914-af89-e89c7a476151" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e17806e9-c78b-41b6-b2d5-7ba0e6461870" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_2e233f64-b57a-4914-af89-e89c7a476151" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_064b73b9-0dfb-4e4e-a079-e6970145877c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e17806e9-c78b-41b6-b2d5-7ba0e6461870" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_064b73b9-0dfb-4e4e-a079-e6970145877c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_37a3cbf0-deb3-4c6e-b41f-6273d520c888" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e17806e9-c78b-41b6-b2d5-7ba0e6461870" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_37a3cbf0-deb3-4c6e-b41f-6273d520c888" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a05badc7-1beb-4362-9766-3134ca0a1a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e17806e9-c78b-41b6-b2d5-7ba0e6461870" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a05badc7-1beb-4362-9766-3134ca0a1a6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ec544d6d-939f-4cb9-a528-3033ebb6bd45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a05badc7-1beb-4362-9766-3134ca0a1a6a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ec544d6d-939f-4cb9-a528-3033ebb6bd45" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ec544d6d-939f-4cb9-a528-3033ebb6bd45_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ec544d6d-939f-4cb9-a528-3033ebb6bd45" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ec544d6d-939f-4cb9-a528-3033ebb6bd45_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ec544d6d-939f-4cb9-a528-3033ebb6bd45" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_d96ede2e-0153-43a4-8e18-188f332035a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LandMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_us-gaap_LandMember_d96ede2e-0153-43a4-8e18-188f332035a4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_4084071b-78e7-4514-8f67-ca197cbac194" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_us-gaap_BuildingMember_4084071b-78e7-4514-8f67-ca197cbac194" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LeaseholdandLandImprovementsMember_110ba66c-2650-443b-9136-0c9c3d73c92f" xlink:href="mic-20211231.xsd#mic_LeaseholdandLandImprovementsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_mic_LeaseholdandLandImprovementsMember_110ba66c-2650-443b-9136-0c9c3d73c92f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_cdf91a0a-a9f7-4b17-9ff8-a99b37eb2df7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_cdf91a0a-a9f7-4b17-9ff8-a99b37eb2df7" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_409bace5-33ed-425e-ae66-8b7fe9b9591f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_409bace5-33ed-425e-ae66-8b7fe9b9591f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_5d6cbeb5-cd2a-4753-8dd8-85ac05b97667" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionInProgressMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bdbedae2-ddf3-49ec-9e80-cc3097166912" xlink:to="loc_us-gaap_ConstructionInProgressMember_5d6cbeb5-cd2a-4753-8dd8-85ac05b97667" xlink:type="arc" order="5"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/IntangibleAssetsandGoodwillScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#IntangibleAssetsandGoodwillScheduleofIntangibleAssetsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/IntangibleAssetsandGoodwillScheduleofIntangibleAssetsDetails" xlink:type="extended" id="i9d22306cc9c5483382ede1fb07748908_IntangibleAssetsandGoodwillScheduleofIntangibleAssetsDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0794a0b8-649a-44a8-8871-0cbcaf3a8499" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_441de77a-85f3-42aa-b91d-cd35bcbf01e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0794a0b8-649a-44a8-8871-0cbcaf3a8499" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_441de77a-85f3-42aa-b91d-cd35bcbf01e1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_2a45e449-9b84-485e-b5fe-4ff5f7350382" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0794a0b8-649a-44a8-8871-0cbcaf3a8499" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_2a45e449-9b84-485e-b5fe-4ff5f7350382" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c3685d4e-f5e9-43ef-adcf-2144d6fc9d34" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0794a0b8-649a-44a8-8871-0cbcaf3a8499" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c3685d4e-f5e9-43ef-adcf-2144d6fc9d34" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_420c3651-cee0-40ff-8f4e-65789ff85a1a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0794a0b8-649a-44a8-8871-0cbcaf3a8499" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_420c3651-cee0-40ff-8f4e-65789ff85a1a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f84ced03-d19a-4763-8906-31086cafa461" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_420c3651-cee0-40ff-8f4e-65789ff85a1a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f84ced03-d19a-4763-8906-31086cafa461" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f84ced03-d19a-4763-8906-31086cafa461_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f84ced03-d19a-4763-8906-31086cafa461" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f84ced03-d19a-4763-8906-31086cafa461_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_44446743-219c-43f7-aaa3-96afeddaedfb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_f84ced03-d19a-4763-8906-31086cafa461" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_44446743-219c-43f7-aaa3-96afeddaedfb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_116d5b38-e0b1-43a4-b2b4-d07961a1f9d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_44446743-219c-43f7-aaa3-96afeddaedfb" xlink:to="loc_us-gaap_CustomerRelationshipsMember_116d5b38-e0b1-43a4-b2b4-d07961a1f9d1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_e2d039bb-d985-4f93-9357-e74147a29f13" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_44446743-219c-43f7-aaa3-96afeddaedfb" xlink:to="loc_us-gaap_TradeNamesMember_e2d039bb-d985-4f93-9357-e74147a29f13" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualRightsMember_368526e8-8fcf-4147-af16-fcbea6c801e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualRightsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_44446743-219c-43f7-aaa3-96afeddaedfb" xlink:to="loc_us-gaap_ContractualRightsMember_368526e8-8fcf-4147-af16-fcbea6c801e7" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/IntangibleAssetsandGoodwillNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#IntangibleAssetsandGoodwillNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/IntangibleAssetsandGoodwillNarrativeDetails" xlink:type="extended" id="ic955ed804f964cf2850f1e905b8cc83b_IntangibleAssetsandGoodwillNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_cedc8515-cff7-414f-a33b-4c32067f723f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8fb526a8-4f48-46f8-9b8a-06cfeba7b53d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_cedc8515-cff7-414f-a33b-4c32067f723f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8fb526a8-4f48-46f8-9b8a-06cfeba7b53d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_c79c726b-26f6-47be-b09a-b17767c3ef5f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_cedc8515-cff7-414f-a33b-4c32067f723f" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_c79c726b-26f6-47be-b09a-b17767c3ef5f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_9f7b7333-a369-4000-b237-a4b4c6182fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_cedc8515-cff7-414f-a33b-4c32067f723f" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_9f7b7333-a369-4000-b237-a4b4c6182fcb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5e17421e-34a9-48d8-8e89-173d83e91c4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_9f7b7333-a369-4000-b237-a4b4c6182fcb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5e17421e-34a9-48d8-8e89-173d83e91c4c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5e17421e-34a9-48d8-8e89-173d83e91c4c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5e17421e-34a9-48d8-8e89-173d83e91c4c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5e17421e-34a9-48d8-8e89-173d83e91c4c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22e247c6-2693-457c-bcdf-2876787eb998" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5e17421e-34a9-48d8-8e89-173d83e91c4c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22e247c6-2693-457c-bcdf-2876787eb998" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_777bbdd3-995a-40e8-87d6-e0a01d8b600a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22e247c6-2693-457c-bcdf-2876787eb998" xlink:to="loc_us-gaap_TradeNamesMember_777bbdd3-995a-40e8-87d6-e0a01d8b600a" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/IntangibleAssetsandGoodwillScheduleofGoodwillDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#IntangibleAssetsandGoodwillScheduleofGoodwillDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/IntangibleAssetsandGoodwillScheduleofGoodwillDetails" xlink:type="extended" id="i84eacc09de9b4504b93a92455a4fcc09_IntangibleAssetsandGoodwillScheduleofGoodwillDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_afaf0746-aae9-4a2f-a4bf-667500dd1285" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_afaf0746-aae9-4a2f-a4bf-667500dd1285" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_8b167b0e-1c3a-4b10-90fa-38ba5f664297" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_8b167b0e-1c3a-4b10-90fa-38ba5f664297" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_d7607adc-4e5a-4cc7-9224-4ae34260b0cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_d7607adc-4e5a-4cc7-9224-4ae34260b0cf" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillTransfers_1797229b-72c8-4b08-b10e-08221f8354d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillTransfers"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_GoodwillTransfers_1797229b-72c8-4b08-b10e-08221f8354d9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_7e131102-7894-4346-b11c-f2f517f853ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_Goodwill_7e131102-7894-4346-b11c-f2f517f853ea" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_a080e330-f5fe-4aad-9835-6f9cb9c54fd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_a35a1588-875c-4227-918c-1f98e97587ee" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_a080e330-f5fe-4aad-9835-6f9cb9c54fd2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6e210625-8b75-4e8e-a38f-b5179ebe34a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_a080e330-f5fe-4aad-9835-6f9cb9c54fd2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6e210625-8b75-4e8e-a38f-b5179ebe34a3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6e210625-8b75-4e8e-a38f-b5179ebe34a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6e210625-8b75-4e8e-a38f-b5179ebe34a3" xlink:to="loc_us-gaap_SegmentDomain_6e210625-8b75-4e8e-a38f-b5179ebe34a3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4a97ec3a-6fcd-4857-8a01-6b3a87594b18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6e210625-8b75-4e8e-a38f-b5179ebe34a3" xlink:to="loc_us-gaap_SegmentDomain_4a97ec3a-6fcd-4857-8a01-6b3a87594b18" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationMember_6265c1e1-0384-4884-a97a-0dfcc1a17c42" xlink:href="mic-20211231.xsd#mic_AtlanticAviationMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4a97ec3a-6fcd-4857-8a01-6b3a87594b18" xlink:to="loc_mic_AtlanticAviationMember_6265c1e1-0384-4884-a97a-0dfcc1a17c42" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_ab978685-ac25-4fd4-9d31-c62674250cac" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4a97ec3a-6fcd-4857-8a01-6b3a87594b18" xlink:to="loc_mic_HawaiiGasBusinessMember_ab978685-ac25-4fd4-9d31-c62674250cac" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtNarrativeDetails" xlink:type="extended" id="if9a53aafe0d44c5ebc63dddb0f24947d_LongTermDebtNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_9aa0c5d6-c5ff-4afd-8da1-79309079f7e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentTerm_9aa0c5d6-c5ff-4afd-8da1-79309079f7e0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_40d297a6-6f43-4f9e-b39f-50eb3e650f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_40d297a6-6f43-4f9e-b39f-50eb3e650f1e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_456d07eb-bd90-4f67-85eb-c00e9a6dda91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_ConvertibleDebt_456d07eb-bd90-4f67-85eb-c00e9a6dda91" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_ba7904e1-8d42-4450-9fba-e5da3e3ca7e5" xlink:href="mic-20211231.xsd#mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_ba7904e1-8d42-4450-9fba-e5da3e3ca7e5" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_7b63928b-eadb-45a8-a06c-e103003496fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_7b63928b-eadb-45a8-a06c-e103003496fd" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_dce7d443-4dcb-4953-aefa-8dbc8e219032" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_dce7d443-4dcb-4953-aefa-8dbc8e219032" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_d5f1ec57-304d-45de-91dd-f4c73736b6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_d5f1ec57-304d-45de-91dd-f4c73736b6c0" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_46af281e-b576-4b7f-9df7-1b0adcdcabfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_46af281e-b576-4b7f-9df7-1b0adcdcabfa" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtFairValueDisclosures_d3f42a50-432b-422e-bc5f-f19c421551ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtFairValueDisclosures"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_ConvertibleDebtFairValueDisclosures_d3f42a50-432b-422e-bc5f-f19c421551ed" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4735e1bf-7eb9-4261-ab11-38cd5b340545" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4735e1bf-7eb9-4261-ab11-38cd5b340545" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_4604daff-ba54-49e8-ba99-1b182e8b5df2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_4604daff-ba54-49e8-ba99-1b182e8b5df2" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_8d4380d1-a41d-4181-a770-da175ca14927" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_8d4380d1-a41d-4181-a770-da175ca14927" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_0e192db9-b2df-4fb0-a5d8-9b7fe4ce1d49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_0e192db9-b2df-4fb0-a5d8-9b7fe4ce1d49" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_3ce0dfc1-0081-40f1-b71f-01be2c4028a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_LongTermDebtFairValue_3ce0dfc1-0081-40f1-b71f-01be2c4028a4" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_1197b4f1-6db7-4d5a-917a-e4a4cecd3244" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_1197b4f1-6db7-4d5a-917a-e4a4cecd3244" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_d8040527-4538-4f67-9c54-29e5f16989ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_d8040527-4538-4f67-9c54-29e5f16989ac" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1641b57a-4ee4-4069-afc7-f4ad26ccbdc8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1641b57a-4ee4-4069-afc7-f4ad26ccbdc8" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_37d8dc57-3cc6-41f4-be85-7ef3b58ad426" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFixedInterestRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_37d8dc57-3cc6-41f4-be85-7ef3b58ad426" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfExtensions_73a5ac76-5a2d-4a8f-a869-267a6f9efe21" xlink:href="mic-20211231.xsd#mic_NumberOfExtensions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_mic_NumberOfExtensions_73a5ac76-5a2d-4a8f-a869-267a6f9efe21" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtInstrumentExtensionTerm_35359ad7-8f54-47fd-81d0-448970f32de9" xlink:href="mic-20211231.xsd#mic_DebtInstrumentExtensionTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_mic_DebtInstrumentExtensionTerm_35359ad7-8f54-47fd-81d0-448970f32de9" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_0e480826-ddda-4b4b-b9c6-8ba38bf01629" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_LongTermDebt_0e480826-ddda-4b4b-b9c6-8ba38bf01629" xlink:type="arc" order="20"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_3be58457-651f-4967-8a04-4a5fe32c12aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_3be58457-651f-4967-8a04-4a5fe32c12aa" xlink:type="arc" order="21"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_8a20d5ed-b3ac-45ad-94b3-5f008859faa4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_8a20d5ed-b3ac-45ad-94b3-5f008859faa4" xlink:type="arc" order="22"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_47fb2f4e-dce3-45a3-bc96-b5827061979f" xlink:to="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b77b9836-7f1c-445a-9f83-e610f32edd37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b77b9836-7f1c-445a-9f83-e610f32edd37" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b77b9836-7f1c-445a-9f83-e610f32edd37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b77b9836-7f1c-445a-9f83-e610f32edd37" xlink:to="loc_us-gaap_SegmentDomain_b77b9836-7f1c-445a-9f83-e610f32edd37_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_817625e4-a251-400b-9426-1f14ca6c61ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b77b9836-7f1c-445a-9f83-e610f32edd37" xlink:to="loc_us-gaap_SegmentDomain_817625e4-a251-400b-9426-1f14ca6c61ce" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_b87018ca-45f9-4d7b-acee-4be67dd01c8f" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_817625e4-a251-400b-9426-1f14ca6c61ce" xlink:to="loc_mic_HawaiiGasBusinessMember_b87018ca-45f9-4d7b-acee-4be67dd01c8f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1d877650-2225-432b-a220-36fab6534228" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_CreditFacilityAxis_1d877650-2225-432b-a220-36fab6534228" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1d877650-2225-432b-a220-36fab6534228_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1d877650-2225-432b-a220-36fab6534228" xlink:to="loc_us-gaap_CreditFacilityDomain_1d877650-2225-432b-a220-36fab6534228_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1815a410-6557-4fda-9d9c-874a939d5be8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1d877650-2225-432b-a220-36fab6534228" xlink:to="loc_us-gaap_CreditFacilityDomain_1815a410-6557-4fda-9d9c-874a939d5be8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_21196cd7-aa3d-441b-844a-105b8d4b775a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_1815a410-6557-4fda-9d9c-874a939d5be8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_21196cd7-aa3d-441b-844a-105b8d4b775a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TermLoanFacilityMember_cec84026-f10d-4824-802b-59ceaf008877" xlink:href="mic-20211231.xsd#mic_TermLoanFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_1815a410-6557-4fda-9d9c-874a939d5be8" xlink:to="loc_mic_TermLoanFacilityMember_cec84026-f10d-4824-802b-59ceaf008877" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cb305ec9-7d28-41d6-b863-f2db2d78cb95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cb305ec9-7d28-41d6-b863-f2db2d78cb95" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cb305ec9-7d28-41d6-b863-f2db2d78cb95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cb305ec9-7d28-41d6-b863-f2db2d78cb95" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cb305ec9-7d28-41d6-b863-f2db2d78cb95_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_92bfae2e-c5ef-4960-b032-7d4fe240477f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cb305ec9-7d28-41d6-b863-f2db2d78cb95" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_92bfae2e-c5ef-4960-b032-7d4fe240477f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_617e4135-9005-477d-b457-b9cf50052373" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_92bfae2e-c5ef-4960-b032-7d4fe240477f" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_617e4135-9005-477d-b457-b9cf50052373" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_138be461-bb0d-498f-97b3-86acd4140fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeniorNotesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_92bfae2e-c5ef-4960-b032-7d4fe240477f" xlink:to="loc_us-gaap_SeniorNotesMember_138be461-bb0d-498f-97b3-86acd4140fb2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_30260fa4-90c0-4eb5-9aee-5181d9747ede" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_srt_RangeAxis_30260fa4-90c0-4eb5-9aee-5181d9747ede" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_30260fa4-90c0-4eb5-9aee-5181d9747ede_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_30260fa4-90c0-4eb5-9aee-5181d9747ede" xlink:to="loc_srt_RangeMember_30260fa4-90c0-4eb5-9aee-5181d9747ede_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2462a3f2-beb1-4c23-84db-4c5fcab17501" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_30260fa4-90c0-4eb5-9aee-5181d9747ede" xlink:to="loc_srt_RangeMember_2462a3f2-beb1-4c23-84db-4c5fcab17501" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c01dc8d6-3583-4ada-b802-2150b8025671" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2462a3f2-beb1-4c23-84db-4c5fcab17501" xlink:to="loc_srt_MinimumMember_c01dc8d6-3583-4ada-b802-2150b8025671" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f04bc1eb-c5d4-44d0-879f-d7d7f21f67db" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2462a3f2-beb1-4c23-84db-4c5fcab17501" xlink:to="loc_srt_MaximumMember_f04bc1eb-c5d4-44d0-879f-d7d7f21f67db" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_a629027d-6a8b-4661-a53b-4ea4159611ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_a629027d-6a8b-4661-a53b-4ea4159611ce" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_a629027d-6a8b-4661-a53b-4ea4159611ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_a629027d-6a8b-4661-a53b-4ea4159611ce" xlink:to="loc_us-gaap_TypeOfAdoptionMember_a629027d-6a8b-4661-a53b-4ea4159611ce_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_cbd66460-bbc5-4554-92e2-c4c80d0fd818" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_a629027d-6a8b-4661-a53b-4ea4159611ce" xlink:to="loc_us-gaap_TypeOfAdoptionMember_cbd66460-bbc5-4554-92e2-c4c80d0fd818" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_3d4d3179-3e03-4cca-8085-cb076ce33a76" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_cbd66460-bbc5-4554-92e2-c4c80d0fd818" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_3d4d3179-3e03-4cca-8085-cb076ce33a76" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_af5d6a27-f223-437d-917a-fe032a7df9df" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_af5d6a27-f223-437d-917a-fe032a7df9df" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_af5d6a27-f223-437d-917a-fe032a7df9df_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_af5d6a27-f223-437d-917a-fe032a7df9df" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_af5d6a27-f223-437d-917a-fe032a7df9df_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3c86f44e-c436-45a8-88ef-5d90425efeaf" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_af5d6a27-f223-437d-917a-fe032a7df9df" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3c86f44e-c436-45a8-88ef-5d90425efeaf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_130697e2-26e4-493c-8912-de6bf4850de9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3c86f44e-c436-45a8-88ef-5d90425efeaf" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_130697e2-26e4-493c-8912-de6bf4850de9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_464c86db-9169-4a79-972c-e9c05a043976" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_464c86db-9169-4a79-972c-e9c05a043976" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_464c86db-9169-4a79-972c-e9c05a043976_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_464c86db-9169-4a79-972c-e9c05a043976" xlink:to="loc_us-gaap_EquityComponentDomain_464c86db-9169-4a79-972c-e9c05a043976_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ed4ed20c-f8f9-449e-b5b2-1a16a0b40316" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_464c86db-9169-4a79-972c-e9c05a043976" xlink:to="loc_us-gaap_EquityComponentDomain_ed4ed20c-f8f9-449e-b5b2-1a16a0b40316" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_fedc116e-51ae-4926-b528-35732eeec63b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ed4ed20c-f8f9-449e-b5b2-1a16a0b40316" xlink:to="loc_us-gaap_RetainedEarningsMember_fedc116e-51ae-4926-b528-35732eeec63b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5c489cfb-1e4e-407f-bb32-536c7dbc5d98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b1b544a2-0ed8-41bd-a5d6-96ebf589b7ea" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5c489cfb-1e4e-407f-bb32-536c7dbc5d98" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_a59a6b45-4787-4639-b826-25d35bc34cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_5c489cfb-1e4e-407f-bb32-536c7dbc5d98" xlink:to="loc_us-gaap_InterestRateSwapMember_a59a6b45-4787-4639-b826-25d35bc34cc1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8a90ce4d-00b6-4392-9919-cb1424c1e369" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8a90ce4d-00b6-4392-9919-cb1424c1e369" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8a90ce4d-00b6-4392-9919-cb1424c1e369_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8a90ce4d-00b6-4392-9919-cb1424c1e369" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8a90ce4d-00b6-4392-9919-cb1424c1e369_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d5cd357-40a0-49b5-868c-443d07cfff7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8a90ce4d-00b6-4392-9919-cb1424c1e369" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d5cd357-40a0-49b5-868c-443d07cfff7e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SolarPowerFacilitiesMember_8611222e-86da-4a55-90fa-a71c5906ffde" xlink:href="mic-20211231.xsd#mic_SolarPowerFacilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d5cd357-40a0-49b5-868c-443d07cfff7e" xlink:to="loc_mic_SolarPowerFacilitiesMember_8611222e-86da-4a55-90fa-a71c5906ffde" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_756aee87-e0ba-4102-9062-b04d88bfdae4" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fc83893-1fed-4dcf-bfaf-1d5519431c78" xlink:to="loc_dei_LegalEntityAxis_756aee87-e0ba-4102-9062-b04d88bfdae4" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_756aee87-e0ba-4102-9062-b04d88bfdae4_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_756aee87-e0ba-4102-9062-b04d88bfdae4" xlink:to="loc_dei_EntityDomain_756aee87-e0ba-4102-9062-b04d88bfdae4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c2e0f7c4-70a7-4598-94cd-3ac9f49614a2" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_756aee87-e0ba-4102-9062-b04d88bfdae4" xlink:to="loc_dei_EntityDomain_c2e0f7c4-70a7-4598-94cd-3ac9f49614a2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MicHawaiiMember_b0798a8c-6f60-4791-9d63-819852e67fac" xlink:href="mic-20211231.xsd#mic_MicHawaiiMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c2e0f7c4-70a7-4598-94cd-3ac9f49614a2" xlink:to="loc_mic_MicHawaiiMember_b0798a8c-6f60-4791-9d63-819852e67fac" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtScheduleofLongTermDebtDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtScheduleofLongTermDebtDetails" xlink:type="extended" id="i535e1a0927164dcea60bbdc99de9eb57_LongTermDebtScheduleofLongTermDebtDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ee3f1e14-ae80-42b6-8619-f039ef2b04bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ee3f1e14-ae80-42b6-8619-f039ef2b04bb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_df610536-00ff-4638-ba4f-d21d658b9ce3" xlink:href="mic-20211231.xsd#mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_df610536-00ff-4638-ba4f-d21d658b9ce3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LongTermDebtCurrent1_18eb5db3-ec4a-4b3d-a021-3547f0a0ebcd" xlink:href="mic-20211231.xsd#mic_LongTermDebtCurrent1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_mic_LongTermDebtCurrent1_18eb5db3-ec4a-4b3d-a021-3547f0a0ebcd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LongTermDebtNoncurrent1_91fcbf06-7b3b-4976-84e5-18e66fee2de0" xlink:href="mic-20211231.xsd#mic_LongTermDebtNoncurrent1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_mic_LongTermDebtNoncurrent1_91fcbf06-7b3b-4976-84e5-18e66fee2de0" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_2a039357-6ccd-4b91-9ec1-700aa9b7e962" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_2a039357-6ccd-4b91-9ec1-700aa9b7e962" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_2c4696af-4ea6-477f-bdf3-bdb11b70350f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_2c4696af-4ea6-477f-bdf3-bdb11b70350f" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts_dbccd2cd-b1c9-4032-882a-bf95d518791e" xlink:href="mic-20211231.xsd#mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_mic_WeightedAverageRemainingLifeOfDeferredFinancingCosts_dbccd2cd-b1c9-4032-882a-bf95d518791e" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_0142c50e-5999-456e-8706-34bd300010f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d674731-0973-423c-91a7-4817fabc77df" xlink:to="loc_us-gaap_DebtInstrumentTable_0142c50e-5999-456e-8706-34bd300010f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5d2fe47b-f581-415e-a945-115840f5dd9d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0142c50e-5999-456e-8706-34bd300010f3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5d2fe47b-f581-415e-a945-115840f5dd9d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5d2fe47b-f581-415e-a945-115840f5dd9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5d2fe47b-f581-415e-a945-115840f5dd9d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5d2fe47b-f581-415e-a945-115840f5dd9d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_09e5c69b-e098-4b88-868b-0c463738c522" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5d2fe47b-f581-415e-a945-115840f5dd9d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_09e5c69b-e098-4b88-868b-0c463738c522" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_1dd37980-c7fb-4788-b79d-89d863c1be96" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoansPayableMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_09e5c69b-e098-4b88-868b-0c463738c522" xlink:to="loc_us-gaap_LoansPayableMember_1dd37980-c7fb-4788-b79d-89d863c1be96" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_eaa0e673-1a54-4a68-9685-3b12386d1516" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_09e5c69b-e098-4b88-868b-0c463738c522" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_eaa0e673-1a54-4a68-9685-3b12386d1516" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b6159a01-19dc-44c3-b51f-64b9eb2c28b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0142c50e-5999-456e-8706-34bd300010f3" xlink:to="loc_us-gaap_DebtInstrumentAxis_b6159a01-19dc-44c3-b51f-64b9eb2c28b8" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b6159a01-19dc-44c3-b51f-64b9eb2c28b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b6159a01-19dc-44c3-b51f-64b9eb2c28b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b6159a01-19dc-44c3-b51f-64b9eb2c28b8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_41f0740d-d001-420c-830c-f4b8ee568f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b6159a01-19dc-44c3-b51f-64b9eb2c28b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_41f0740d-d001-420c-830c-f4b8ee568f9d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TermLoanHawaiiGasMember_40bb7e8f-c7e8-4e3d-a574-6c4d19758aca" xlink:href="mic-20211231.xsd#mic_TermLoanHawaiiGasMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_41f0740d-d001-420c-830c-f4b8ee568f9d" xlink:to="loc_mic_TermLoanHawaiiGasMember_40bb7e8f-c7e8-4e3d-a574-6c4d19758aca" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TermLoanSolarFacilitiesInHawaiiMember_e230c612-eb18-4961-ba8f-d7fd457a950d" xlink:href="mic-20211231.xsd#mic_TermLoanSolarFacilitiesInHawaiiMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_41f0740d-d001-420c-830c-f4b8ee568f9d" xlink:to="loc_mic_TermLoanSolarFacilitiesInHawaiiMember_e230c612-eb18-4961-ba8f-d7fd457a950d" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtScheduleof200ConvertibleSeniorNotesDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtScheduleof200ConvertibleSeniorNotesDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtScheduleof200ConvertibleSeniorNotesDetails" xlink:type="extended" id="i391b0bd723b14c089c6818e67e8b39ca_LongTermDebtScheduleof200ConvertibleSeniorNotesDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1c977d54-a1d8-4d1c-9160-f73f7c6f4962" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1c977d54-a1d8-4d1c-9160-f73f7c6f4962" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_df5e3f6b-3292-4441-bb91-f310aa271cee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_ConvertibleDebt_df5e3f6b-3292-4441-bb91-f310aa271cee" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3242a01d-53f5-442b-9bcb-4ee1e8fe7ebb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3242a01d-53f5-442b-9bcb-4ee1e8fe7ebb" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_29a01e62-bacb-448c-b65b-9ded8567a6d0" xlink:href="mic-20211231.xsd#mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_29a01e62-bacb-448c-b65b-9ded8567a6d0" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_97dcce96-9d4e-40e1-a825-392ea2c5025d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_97dcce96-9d4e-40e1-a825-392ea2c5025d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_efaa5cf8-25fc-4d31-8820-8715f77af02f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_efaa5cf8-25fc-4d31-8820-8715f77af02f" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_f4c4fceb-6658-43fc-9ffd-6d1cce66932d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_f4c4fceb-6658-43fc-9ffd-6d1cce66932d" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c4615515-6bb4-4d96-9d89-08eef1b7d9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a326aa69-c74b-420b-81a5-6053e983534f" xlink:to="loc_us-gaap_DebtInstrumentTable_c4615515-6bb4-4d96-9d89-08eef1b7d9ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_83c771a6-e8e1-493f-8619-f44c46b71bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c4615515-6bb4-4d96-9d89-08eef1b7d9ff" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_83c771a6-e8e1-493f-8619-f44c46b71bbe" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_83c771a6-e8e1-493f-8619-f44c46b71bbe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83c771a6-e8e1-493f-8619-f44c46b71bbe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_83c771a6-e8e1-493f-8619-f44c46b71bbe_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_56837712-e237-4b4d-97d1-ca4eb6be2b08" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83c771a6-e8e1-493f-8619-f44c46b71bbe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_56837712-e237-4b4d-97d1-ca4eb6be2b08" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_6904188b-6b32-46f4-b6f2-5a9bd7fb5203" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_56837712-e237-4b4d-97d1-ca4eb6be2b08" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_6904188b-6b32-46f4-b6f2-5a9bd7fb5203" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtScheduleofInterestExpenseDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtScheduleofInterestExpenseDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtScheduleofInterestExpenseDetails" xlink:type="extended" id="ia35fc4e4ee60434295dac9001339d487_LongTermDebtScheduleofInterestExpenseDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8cbced0a-d475-4b85-9ccc-727bbd4400e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8cbced0a-d475-4b85-9ccc-727bbd4400e4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_ec034fce-5cd5-468f-a11b-70c619578bae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_ec034fce-5cd5-468f-a11b-70c619578bae" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_ff5e046d-47c7-491b-84f2-862b50f68fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_ff5e046d-47c7-491b-84f2-862b50f68fcb" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_4ff3e51f-c8c4-4c4f-ad40-a490161e8399" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_4ff3e51f-c8c4-4c4f-ad40-a490161e8399" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_74d791af-522e-486f-bccb-3b1b5f294f70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_74d791af-522e-486f-bccb-3b1b5f294f70" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_4dbf5985-ebbf-4ba4-986d-c3707cec60bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_InterestExpenseDebt_4dbf5985-ebbf-4ba4-986d-c3707cec60bb" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3a02853f-adfc-4068-9e2d-e46a7db4b1a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_c528de44-7af8-4e4b-989b-e18ddbbe22c1" xlink:to="loc_us-gaap_DebtInstrumentTable_3a02853f-adfc-4068-9e2d-e46a7db4b1a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f926f986-1654-435a-af68-cbc6293b610c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3a02853f-adfc-4068-9e2d-e46a7db4b1a2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f926f986-1654-435a-af68-cbc6293b610c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f926f986-1654-435a-af68-cbc6293b610c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f926f986-1654-435a-af68-cbc6293b610c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f926f986-1654-435a-af68-cbc6293b610c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_110cc2de-e8fc-4046-a270-fec681052000" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f926f986-1654-435a-af68-cbc6293b610c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_110cc2de-e8fc-4046-a270-fec681052000" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_526f4745-6f05-419c-8ce6-651307687881" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_110cc2de-e8fc-4046-a270-fec681052000" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_526f4745-6f05-419c-8ce6-651307687881" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtKeyTermsof200ConvertibleSeniorNoteDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtKeyTermsof200ConvertibleSeniorNoteDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtKeyTermsof200ConvertibleSeniorNoteDetails" xlink:type="extended" id="i1db7079a14be45eea95adedfde5968cd_LongTermDebtKeyTermsof200ConvertibleSeniorNoteDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7fd84479-e1be-4086-b5cd-597ed9e3b698" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_b121c66b-485d-46e0-ab3f-13b1d21f8fa6" xlink:href="mic-20211231.xsd#mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7fd84479-e1be-4086-b5cd-597ed9e3b698" xlink:to="loc_mic_DebtInstrumentAfterUnamortizedDiscountBeforeDebtIssuanceCosts_b121c66b-485d-46e0-ab3f-13b1d21f8fa6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1327084c-8234-4903-a0cf-e3bb33fbd3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7fd84479-e1be-4086-b5cd-597ed9e3b698" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1327084c-8234-4903-a0cf-e3bb33fbd3d1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e2e447e7-03a0-4ece-b317-c3d83e09bb19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7fd84479-e1be-4086-b5cd-597ed9e3b698" xlink:to="loc_us-gaap_DebtInstrumentTable_e2e447e7-03a0-4ece-b317-c3d83e09bb19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b0595793-504e-48b6-aad9-d4bae01a36b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e2e447e7-03a0-4ece-b317-c3d83e09bb19" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b0595793-504e-48b6-aad9-d4bae01a36b1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b0595793-504e-48b6-aad9-d4bae01a36b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b0595793-504e-48b6-aad9-d4bae01a36b1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b0595793-504e-48b6-aad9-d4bae01a36b1_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e4856fb5-ad7c-4948-bfd1-8fe883754c48" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b0595793-504e-48b6-aad9-d4bae01a36b1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e4856fb5-ad7c-4948-bfd1-8fe883754c48" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_cc71f1c3-7cf8-49a8-a6db-de7f13cca521" xlink:href="mic-20211231.xsd#mic_ConvertibleSeniorNotes200DueOctober2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e4856fb5-ad7c-4948-bfd1-8fe883754c48" xlink:to="loc_mic_ConvertibleSeniorNotes200DueOctober2023Member_cc71f1c3-7cf8-49a8-a6db-de7f13cca521" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/LongTermDebtKeyTermsofTermLoanSeniorNotesandRevolvingCreditFacilityofHawaiiGasDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#LongTermDebtKeyTermsofTermLoanSeniorNotesandRevolvingCreditFacilityofHawaiiGasDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/LongTermDebtKeyTermsofTermLoanSeniorNotesandRevolvingCreditFacilityofHawaiiGasDetails" xlink:type="extended" id="i72a4fe280bdf477baf4be6abb909fa8e_LongTermDebtKeyTermsofTermLoanSeniorNotesandRevolvingCreditFacilityofHawaiiGasDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d63aa4cf-ae0a-4db2-bb43-8b2bdeff5fec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7a1097ab-e6f7-486d-a1ba-eeec01271e5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d63aa4cf-ae0a-4db2-bb43-8b2bdeff5fec" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7a1097ab-e6f7-486d-a1ba-eeec01271e5b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fd17e7c1-26d9-49ca-954e-dc5652438437" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d63aa4cf-ae0a-4db2-bb43-8b2bdeff5fec" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_fd17e7c1-26d9-49ca-954e-dc5652438437" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_166513db-a1e6-4f89-97fd-98a40902a3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d63aa4cf-ae0a-4db2-bb43-8b2bdeff5fec" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_166513db-a1e6-4f89-97fd-98a40902a3f2" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_29c04558-8728-43a6-8977-8c75019e333e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d63aa4cf-ae0a-4db2-bb43-8b2bdeff5fec" xlink:to="loc_us-gaap_DebtInstrumentTable_29c04558-8728-43a6-8977-8c75019e333e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_c2290c87-7e65-44be-af05-60646e4a8fbf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_29c04558-8728-43a6-8977-8c75019e333e" xlink:to="loc_us-gaap_CreditFacilityAxis_c2290c87-7e65-44be-af05-60646e4a8fbf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c2290c87-7e65-44be-af05-60646e4a8fbf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_c2290c87-7e65-44be-af05-60646e4a8fbf" xlink:to="loc_us-gaap_CreditFacilityDomain_c2290c87-7e65-44be-af05-60646e4a8fbf_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_93f26b81-fac1-4a9e-afa1-e1587f5c0c43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_c2290c87-7e65-44be-af05-60646e4a8fbf" xlink:to="loc_us-gaap_CreditFacilityDomain_93f26b81-fac1-4a9e-afa1-e1587f5c0c43" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TermLoanFacilityMember_7b30fa8e-e838-4dbd-b343-a501b7a26cb8" xlink:href="mic-20211231.xsd#mic_TermLoanFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_93f26b81-fac1-4a9e-afa1-e1587f5c0c43" xlink:to="loc_mic_TermLoanFacilityMember_7b30fa8e-e838-4dbd-b343-a501b7a26cb8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7e2bf169-881c-4626-a1b5-8dcfb97ff75e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_93f26b81-fac1-4a9e-afa1-e1587f5c0c43" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_7e2bf169-881c-4626-a1b5-8dcfb97ff75e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_96c8856c-b4eb-4be3-ab04-c7c6c051dd49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_29c04558-8728-43a6-8977-8c75019e333e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_96c8856c-b4eb-4be3-ab04-c7c6c051dd49" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_96c8856c-b4eb-4be3-ab04-c7c6c051dd49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_96c8856c-b4eb-4be3-ab04-c7c6c051dd49" xlink:to="loc_us-gaap_SegmentDomain_96c8856c-b4eb-4be3-ab04-c7c6c051dd49_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_544ab826-a046-419c-af04-5c1d4a744b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_96c8856c-b4eb-4be3-ab04-c7c6c051dd49" xlink:to="loc_us-gaap_SegmentDomain_544ab826-a046-419c-af04-5c1d4a744b6c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_ec417ff3-7c50-4881-89a3-49c149157a54" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_544ab826-a046-419c-af04-5c1d4a744b6c" xlink:to="loc_mic_HawaiiGasBusinessMember_ec417ff3-7c50-4881-89a3-49c149157a54" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_29c04558-8728-43a6-8977-8c75019e333e" xlink:to="loc_us-gaap_VariableRateAxis_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4" xlink:to="loc_us-gaap_VariableRateDomain_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_7fdfa8b1-0ead-40a0-aa57-b6dd21fc327e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_0af9cecd-87c4-4d7a-a4dd-2a7431dc02e4" xlink:to="loc_us-gaap_VariableRateDomain_7fdfa8b1-0ead-40a0-aa57-b6dd21fc327e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_d4d800b5-b71a-48d9-ae0b-529e31ec5da5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_7fdfa8b1-0ead-40a0-aa57-b6dd21fc327e" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_d4d800b5-b71a-48d9-ae0b-529e31ec5da5" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/DerivativeInstrumentsandHedgingActivitiesNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#DerivativeInstrumentsandHedgingActivitiesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/DerivativeInstrumentsandHedgingActivitiesNarrativeDetails" xlink:type="extended" id="i32b33a9ed9ff49ddbe01869d781a7741_DerivativeInstrumentsandHedgingActivitiesNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_0806e516-6edf-4608-bf33-55473ed4271d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DerivativeNotionalAmount_0806e516-6edf-4608-bf33-55473ed4271d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_035b286f-c382-478d-a280-a1eb783ef27f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DebtInstrumentTerm_035b286f-c382-478d-a280-a1eb783ef27f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4ada489a-81ec-47e9-b98f-45874a71cf7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_4ada489a-81ec-47e9-b98f-45874a71cf7c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_af4740b7-f7de-42b9-bc3d-3be860cc2854" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_af4740b7-f7de-42b9-bc3d-3be860cc2854" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_d4e76d90-9846-46cb-80f5-2d998e82f57d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_d4e76d90-9846-46cb-80f5-2d998e82f57d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_69b64334-201e-405f-844c-f940eba3ed38" xlink:to="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_91057981-00f0-4fb9-a196-40333618e6af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_91057981-00f0-4fb9-a196-40333618e6af" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_91057981-00f0-4fb9-a196-40333618e6af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_91057981-00f0-4fb9-a196-40333618e6af" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_91057981-00f0-4fb9-a196-40333618e6af_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b7ca69d5-212f-4ff1-859a-637747183393" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_91057981-00f0-4fb9-a196-40333618e6af" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b7ca69d5-212f-4ff1-859a-637747183393" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_653b6842-7675-40c4-b877-709292f82b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b7ca69d5-212f-4ff1-859a-637747183393" xlink:to="loc_us-gaap_InterestRateSwapMember_653b6842-7675-40c4-b877-709292f82b3e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CommodityPriceHedgesMember_2f387194-4b1c-495d-9f7d-d52f5282cef0" xlink:href="mic-20211231.xsd#mic_CommodityPriceHedgesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b7ca69d5-212f-4ff1-859a-637747183393" xlink:to="loc_mic_CommodityPriceHedgesMember_2f387194-4b1c-495d-9f7d-d52f5282cef0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1d44827a-15b4-45ac-89c0-d6162a834287" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1d44827a-15b4-45ac-89c0-d6162a834287" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1d44827a-15b4-45ac-89c0-d6162a834287_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d44827a-15b4-45ac-89c0-d6162a834287" xlink:to="loc_us-gaap_SegmentDomain_1d44827a-15b4-45ac-89c0-d6162a834287_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_054d7b55-ccf1-4ee4-b80c-a026b9c89b15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d44827a-15b4-45ac-89c0-d6162a834287" xlink:to="loc_us-gaap_SegmentDomain_054d7b55-ccf1-4ee4-b80c-a026b9c89b15" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_f009c52e-50c2-4398-8139-d9c3e44e211e" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_054d7b55-ccf1-4ee4-b80c-a026b9c89b15" xlink:to="loc_mic_HawaiiGasBusinessMember_f009c52e-50c2-4398-8139-d9c3e44e211e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MicHawaiiMember_5e77c735-88e7-460d-a90e-5815908fe515" xlink:href="mic-20211231.xsd#mic_MicHawaiiMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_054d7b55-ccf1-4ee4-b80c-a026b9c89b15" xlink:to="loc_mic_MicHawaiiMember_5e77c735-88e7-460d-a90e-5815908fe515" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_fc75bef5-78fc-45b3-addd-b7607082391d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:to="loc_us-gaap_CreditFacilityAxis_fc75bef5-78fc-45b3-addd-b7607082391d" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_fc75bef5-78fc-45b3-addd-b7607082391d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_fc75bef5-78fc-45b3-addd-b7607082391d" xlink:to="loc_us-gaap_CreditFacilityDomain_fc75bef5-78fc-45b3-addd-b7607082391d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ea08ecdd-f70b-4e0f-969c-1c733218a265" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_fc75bef5-78fc-45b3-addd-b7607082391d" xlink:to="loc_us-gaap_CreditFacilityDomain_ea08ecdd-f70b-4e0f-969c-1c733218a265" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TermLoanFacilityMember_4ce93c9c-404c-4067-8c3c-c237d42045b0" xlink:href="mic-20211231.xsd#mic_TermLoanFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ea08ecdd-f70b-4e0f-969c-1c733218a265" xlink:to="loc_mic_TermLoanFacilityMember_4ce93c9c-404c-4067-8c3c-c237d42045b0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_6a0038a3-ee09-4328-b4cb-bb238f785073" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:to="loc_us-gaap_SubsegmentsAxis_6a0038a3-ee09-4328-b4cb-bb238f785073" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_6a0038a3-ee09-4328-b4cb-bb238f785073_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsegmentsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_6a0038a3-ee09-4328-b4cb-bb238f785073" xlink:to="loc_us-gaap_SubsegmentsDomain_6a0038a3-ee09-4328-b4cb-bb238f785073_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_84f48a5b-23b3-492e-9ab3-c35e25faa98d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsegmentsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_6a0038a3-ee09-4328-b4cb-bb238f785073" xlink:to="loc_us-gaap_SubsegmentsDomain_84f48a5b-23b3-492e-9ab3-c35e25faa98d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SolarPowerFacilitiesMember_3667f29a-e50f-4d0a-b449-64729e111348" xlink:href="mic-20211231.xsd#mic_SolarPowerFacilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_84f48a5b-23b3-492e-9ab3-c35e25faa98d" xlink:to="loc_mic_SolarPowerFacilitiesMember_3667f29a-e50f-4d0a-b449-64729e111348" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_21b03dc1-310c-45e3-a67d-c4f484df7d3d" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_84f48a5b-23b3-492e-9ab3-c35e25faa98d" xlink:to="loc_mic_HawaiiGasBusinessMember_21b03dc1-310c-45e3-a67d-c4f484df7d3d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_28125265-02e7-4405-bc79-6089a44820ca" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_413c4a52-7c5f-416d-a46f-84beb84a9db3" xlink:to="loc_dei_LegalEntityAxis_28125265-02e7-4405-bc79-6089a44820ca" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_28125265-02e7-4405-bc79-6089a44820ca_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_28125265-02e7-4405-bc79-6089a44820ca" xlink:to="loc_dei_EntityDomain_28125265-02e7-4405-bc79-6089a44820ca_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_09b75db8-afa5-4d40-b94b-a9a2bebd7024" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_28125265-02e7-4405-bc79-6089a44820ca" xlink:to="loc_dei_EntityDomain_09b75db8-afa5-4d40-b94b-a9a2bebd7024" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MICHawaiiHoldingsLLCMember_f25b116a-7fff-40b7-9a4b-adf386dd25ba" xlink:href="mic-20211231.xsd#mic_MICHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_09b75db8-afa5-4d40-b94b-a9a2bebd7024" xlink:to="loc_mic_MICHawaiiHoldingsLLCMember_f25b116a-7fff-40b7-9a4b-adf386dd25ba" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofLocationofHedgingActivitiesDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#DerivativeInstrumentsandHedgingActivitiesScheduleofLocationofHedgingActivitiesDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofLocationofHedgingActivitiesDetails" xlink:type="extended" id="i147ab2cf9f2a4e32899c230e7aff2a86_DerivativeInstrumentsandHedgingActivitiesScheduleofLocationofHedgingActivitiesDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_31804613-dd10-4666-8b56-d215d81139e8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_41c97da2-17c2-4283-a172-7e9498b5d3c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_31804613-dd10-4666-8b56-d215d81139e8" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_41c97da2-17c2-4283-a172-7e9498b5d3c2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_d8e8d1dc-edf9-445e-9834-18761efb1246" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_31804613-dd10-4666-8b56-d215d81139e8" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_d8e8d1dc-edf9-445e-9834-18761efb1246" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_4c88dbb4-0436-4716-b306-bde6bc8eb68a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_d8e8d1dc-edf9-445e-9834-18761efb1246" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_4c88dbb4-0436-4716-b306-bde6bc8eb68a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_4c88dbb4-0436-4716-b306-bde6bc8eb68a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4c88dbb4-0436-4716-b306-bde6bc8eb68a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_4c88dbb4-0436-4716-b306-bde6bc8eb68a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_01352677-94aa-45e9-b29c-a5399f063932" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4c88dbb4-0436-4716-b306-bde6bc8eb68a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_01352677-94aa-45e9-b29c-a5399f063932" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_bcf9356f-4de9-489f-92fd-6dbc8f46ff8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_01352677-94aa-45e9-b29c-a5399f063932" xlink:to="loc_us-gaap_InterestExpenseMember_bcf9356f-4de9-489f-92fd-6dbc8f46ff8c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_38993d72-87ee-4f33-b280-126b99084841" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_01352677-94aa-45e9-b29c-a5399f063932" xlink:to="loc_us-gaap_CostOfSalesMember_38993d72-87ee-4f33-b280-126b99084841" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_49564211-8eb0-4978-8aef-4787eec5b9fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_d8e8d1dc-edf9-445e-9834-18761efb1246" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_49564211-8eb0-4978-8aef-4787eec5b9fd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_49564211-8eb0-4978-8aef-4787eec5b9fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_49564211-8eb0-4978-8aef-4787eec5b9fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_49564211-8eb0-4978-8aef-4787eec5b9fd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_26814cc3-64b4-47ae-b25d-7edadad0ee8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_49564211-8eb0-4978-8aef-4787eec5b9fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_26814cc3-64b4-47ae-b25d-7edadad0ee8d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_17f04d5a-9fa7-4ce6-b249-cef4321bbc82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_26814cc3-64b4-47ae-b25d-7edadad0ee8d" xlink:to="loc_us-gaap_InterestRateSwapMember_17f04d5a-9fa7-4ce6-b249-cef4321bbc82" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_5bfe6a7b-4774-4336-b892-5d46409d0464" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommodityContractMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_26814cc3-64b4-47ae-b25d-7edadad0ee8d" xlink:to="loc_us-gaap_CommodityContractMember_5bfe6a7b-4774-4336-b892-5d46409d0464" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/UnitholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#UnitholdersEquityNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/UnitholdersEquityNarrativeDetails" xlink:type="extended" id="i2f27b217d8c448a4bad39830bb72386d_UnitholdersEquityNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitAuthorized_c0735b3c-f388-4498-99d9-713c880624f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_CommonUnitAuthorized_c0735b3c-f388-4498-99d9-713c880624f7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitAuthorized_5fa1bfcf-ba35-4fb2-8d91-1388849ed03a" xlink:href="mic-20211231.xsd#mic_SpecialUnitAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_SpecialUnitAuthorized_5fa1bfcf-ba35-4fb2-8d91-1388849ed03a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitIssued_4fdc7598-1b61-471d-b275-d1e9e8957133" xlink:href="mic-20211231.xsd#mic_SpecialUnitIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_SpecialUnitIssued_4fdc7598-1b61-471d-b275-d1e9e8957133" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitOutstanding_696f549e-2519-4490-bd84-f61a10e9348f" xlink:href="mic-20211231.xsd#mic_SpecialUnitOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_SpecialUnitOutstanding_696f549e-2519-4490-bd84-f61a10e9348f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitAuthorized_fe6d39f4-3155-48d3-aadc-de2e6d4b4716" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCPreferredUnitAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitAuthorized_fe6d39f4-3155-48d3-aadc-de2e6d4b4716" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitIssued_dedd066b-ab15-44e5-a1f8-5e6841a5256d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_CommonUnitIssued_dedd066b-ab15-44e5-a1f8-5e6841a5256d" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitOutstanding_8d0f807b-11e0-4268-9677-2aead4b8e5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonUnitOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_CommonUnitOutstanding_8d0f807b-11e0-4268-9677-2aead4b8e5a3" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitIssued_07c1c88d-d0e5-4b29-995f-efacd3ca24e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCPreferredUnitIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitIssued_07c1c88d-d0e5-4b29-995f-efacd3ca24e9" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitOutstanding_3322e449-4ce7-4553-8ea7-c6d6a54701fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedLiabilityCompanyLLCPreferredUnitOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCPreferredUnitOutstanding_3322e449-4ce7-4553-8ea7-c6d6a54701fb" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfDirectors_2f1e1a1b-ea5d-4c7a-b9fa-e9bbd5b6d0e5" xlink:href="mic-20211231.xsd#mic_NumberOfDirectors"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_NumberOfDirectors_2f1e1a1b-ea5d-4c7a-b9fa-e9bbd5b6d0e5" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_f9fb1aeb-4471-43eb-8f0f-09da0e37bd49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_f9fb1aeb-4471-43eb-8f0f-09da0e37bd49" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b38c7eb2-5401-45c7-8c34-a46b5c29f8e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b38c7eb2-5401-45c7-8c34-a46b5c29f8e9" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MaximumFairValueOfAwardGrantDate_11c04d5a-6ef9-42a8-bbd5-3a01bb82ddad" xlink:href="mic-20211231.xsd#mic_MaximumFairValueOfAwardGrantDate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_MaximumFairValueOfAwardGrantDate_11c04d5a-6ef9-42a8-bbd5-3a01bb82ddad" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_3c1a694e-215f-424b-a9d2-65f5fbe57547" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_3c1a694e-215f-424b-a9d2-65f5fbe57547" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ce0fced8-9eb4-406e-b684-35ccba41881c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ce0fced8-9eb4-406e-b684-35ccba41881c" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageOfCashComponentIncentiveAward_c1e80121-58b2-4616-ab35-7bcfb903f00c" xlink:href="mic-20211231.xsd#mic_PercentageOfCashComponentIncentiveAward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_PercentageOfCashComponentIncentiveAward_c1e80121-58b2-4616-ab35-7bcfb903f00c" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageOfStockComponentIncentiveAward_58d4398e-e18a-47c8-be7a-04b05ef06f05" xlink:href="mic-20211231.xsd#mic_PercentageOfStockComponentIncentiveAward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_PercentageOfStockComponentIncentiveAward_58d4398e-e18a-47c8-be7a-04b05ef06f05" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_8fbedb22-82d8-4c7a-9dee-0639f0eecafa" xlink:href="mic-20211231.xsd#mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_8fbedb22-82d8-4c7a-9dee-0639f0eecafa" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_15476f0a-472f-49b7-a365-6ca8a2b25be1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_15476f0a-472f-49b7-a365-6ca8a2b25be1" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_54e3b06f-efd2-4a70-9e85-bd8780d38ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_54e3b06f-efd2-4a70-9e85-bd8780d38ed8" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageGrantDateFairValueTotal_ce250591-7261-4a06-ac64-f9b430021112" xlink:href="mic-20211231.xsd#mic_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageGrantDateFairValueTotal"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNonvestedWeightedAverageGrantDateFairValueTotal_ce250591-7261-4a06-ac64-f9b430021112" xlink:type="arc" order="20"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_0bc991cc-871a-48c0-a2ff-b1e31f13e26b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_0bc991cc-871a-48c0-a2ff-b1e31f13e26b" xlink:type="arc" order="21"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a3ae9780-6d2d-4003-8a1d-cef1f33d0cce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a3ae9780-6d2d-4003-8a1d-cef1f33d0cce" xlink:type="arc" order="22"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesGrantedInPeriodFairValueAtTarget_0fc23f41-3a5e-42dc-8592-0dd697a2c330" xlink:href="mic-20211231.xsd#mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesGrantedInPeriodFairValueAtTarget"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_mic_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesGrantedInPeriodFairValueAtTarget_0fc23f41-3a5e-42dc-8592-0dd697a2c330" xlink:type="arc" order="23"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_45fc7247-292e-415f-8ba8-0d51c161f4cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_45fc7247-292e-415f-8ba8-0d51c161f4cf" xlink:type="arc" order="24"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_69e23510-f7fe-4c8c-b321-0288f5c4ca8f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_69e23510-f7fe-4c8c-b321-0288f5c4ca8f" xlink:type="arc" order="25"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f4662cd-c9cf-4235-b7cf-ce1e5cc1c582" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c7cae5c5-fe05-4292-86c4-e0314ad116c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c7cae5c5-fe05-4292-86c4-e0314ad116c2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_c7cae5c5-fe05-4292-86c4-e0314ad116c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c7cae5c5-fe05-4292-86c4-e0314ad116c2" xlink:to="loc_us-gaap_RelatedPartyDomain_c7cae5c5-fe05-4292-86c4-e0314ad116c2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_8c7a5f90-e2c2-47ef-8d18-2142caea68d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c7cae5c5-fe05-4292-86c4-e0314ad116c2" xlink:to="loc_us-gaap_RelatedPartyDomain_8c7a5f90-e2c2-47ef-8d18-2142caea68d0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ManagementMember_0dc9389a-17c6-4a41-8705-ad53db995bb0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ManagementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_8c7a5f90-e2c2-47ef-8d18-2142caea68d0" xlink:to="loc_srt_ManagementMember_0dc9389a-17c6-4a41-8705-ad53db995bb0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_StatementClassOfStockAxis_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353" xlink:to="loc_us-gaap_ClassOfStockDomain_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f2b19869-658b-4acd-9724-730ab43c2e56" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_ceb9b7aa-ca99-4bdc-9fc3-6414c1a89353" xlink:to="loc_us-gaap_ClassOfStockDomain_f2b19869-658b-4acd-9724-730ab43c2e56" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_SpecialUnitsMember_843cc464-998d-4188-b5c9-950673a7c304" xlink:href="mic-20211231.xsd#mic_SpecialUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f2b19869-658b-4acd-9724-730ab43c2e56" xlink:to="loc_mic_SpecialUnitsMember_843cc464-998d-4188-b5c9-950673a7c304" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_AwardTypeAxis_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8f000a24-9bba-4a5d-99b6-4e8b8c4a995e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeForSpecialDividendUnitsMember_c07c029b-fc30-456d-ae31-2495ed86e483" xlink:href="mic-20211231.xsd#mic_MakeWholeForSpecialDividendUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:to="loc_mic_MakeWholeForSpecialDividendUnitsMember_c07c029b-fc30-456d-ae31-2495ed86e483" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DirectorShareUnitsMember_1a8c21e0-9e8c-4a26-8211-3ca6c3e3b17f" xlink:href="mic-20211231.xsd#mic_DirectorShareUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:to="loc_mic_DirectorShareUnitsMember_1a8c21e0-9e8c-4a26-8211-3ca6c3e3b17f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_7678c07b-b2a1-4d8b-bf07-dc856652439d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_7678c07b-b2a1-4d8b-bf07-dc856652439d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_4e719043-16f4-4ec7-9354-64635ed17dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:to="loc_us-gaap_PerformanceSharesMember_4e719043-16f4-4ec7-9354-64635ed17dfc" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RestrictedStockUnitsSpecialGrantsMember_a5035105-4b34-482d-bdfa-975893e88515" xlink:href="mic-20211231.xsd#mic_RestrictedStockUnitsSpecialGrantsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_448b81bf-5e51-455a-874a-85e197e683be" xlink:to="loc_mic_RestrictedStockUnitsSpecialGrantsMember_a5035105-4b34-482d-bdfa-975893e88515" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_646f8ee4-e856-46c5-ba7e-da75727759c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_PlanNameAxis_646f8ee4-e856-46c5-ba7e-da75727759c7" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_646f8ee4-e856-46c5-ba7e-da75727759c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_646f8ee4-e856-46c5-ba7e-da75727759c7" xlink:to="loc_us-gaap_PlanNameDomain_646f8ee4-e856-46c5-ba7e-da75727759c7_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_646f8ee4-e856-46c5-ba7e-da75727759c7" xlink:to="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember_f8018e80-fe60-414b-93a8-1f8b06323f56" xlink:href="mic-20211231.xsd#mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:to="loc_mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember_f8018e80-fe60-414b-93a8-1f8b06323f56" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_OmnibusEmployeeIncentivePlan2016Member_ca9f8efd-04cf-46b4-b398-6a6e7a31e4bf" xlink:href="mic-20211231.xsd#mic_OmnibusEmployeeIncentivePlan2016Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:to="loc_mic_OmnibusEmployeeIncentivePlan2016Member_ca9f8efd-04cf-46b4-b398-6a6e7a31e4bf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwoThousandNineteenShortTermIncentivePlanMember_b68786f1-03e6-4703-a324-d862774ce4c8" xlink:href="mic-20211231.xsd#mic_TwoThousandNineteenShortTermIncentivePlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:to="loc_mic_TwoThousandNineteenShortTermIncentivePlanMember_b68786f1-03e6-4703-a324-d862774ce4c8" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwoThousandNineteenLongTermIncentivePlanMember_b84e6b6d-b3f0-4c87-8092-6a057b4851e5" xlink:href="mic-20211231.xsd#mic_TwoThousandNineteenLongTermIncentivePlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b9cb996f-7509-4bbc-a614-41671982fe2a" xlink:to="loc_mic_TwoThousandNineteenLongTermIncentivePlanMember_b84e6b6d-b3f0-4c87-8092-6a057b4851e5" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_44eabd2a-63c9-4e9b-811c-a0e3768b6aef" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_srt_RangeAxis_44eabd2a-63c9-4e9b-811c-a0e3768b6aef" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_44eabd2a-63c9-4e9b-811c-a0e3768b6aef_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_44eabd2a-63c9-4e9b-811c-a0e3768b6aef" xlink:to="loc_srt_RangeMember_44eabd2a-63c9-4e9b-811c-a0e3768b6aef_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_030bb089-afe3-4a9d-8760-7076a67aebaf" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_44eabd2a-63c9-4e9b-811c-a0e3768b6aef" xlink:to="loc_srt_RangeMember_030bb089-afe3-4a9d-8760-7076a67aebaf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7c310b7d-ec59-4aab-9ca0-949b1ac192a0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_030bb089-afe3-4a9d-8760-7076a67aebaf" xlink:to="loc_srt_MaximumMember_7c310b7d-ec59-4aab-9ca0-949b1ac192a0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_83843b6a-d670-46d9-8c55-1c1ce93e6899" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_030bb089-afe3-4a9d-8760-7076a67aebaf" xlink:to="loc_srt_MinimumMember_83843b6a-d670-46d9-8c55-1c1ce93e6899" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_55583738-77cc-49de-adc6-5d4c57cf3e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_VestingAxis_55583738-77cc-49de-adc6-5d4c57cf3e0d" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_55583738-77cc-49de-adc6-5d4c57cf3e0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_55583738-77cc-49de-adc6-5d4c57cf3e0d" xlink:to="loc_us-gaap_VestingDomain_55583738-77cc-49de-adc6-5d4c57cf3e0d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_89e5f56a-99eb-48b1-b150-42531dc02938" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_55583738-77cc-49de-adc6-5d4c57cf3e0d" xlink:to="loc_us-gaap_VestingDomain_89e5f56a-99eb-48b1-b150-42531dc02938" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_0f7c5f57-3c30-4cd8-9fa6-a2bbe76fa902" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_89e5f56a-99eb-48b1-b150-42531dc02938" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_0f7c5f57-3c30-4cd8-9fa6-a2bbe76fa902" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_d510d433-fc03-4c3f-9da0-87fd5b8435fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_89e5f56a-99eb-48b1-b150-42531dc02938" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_d510d433-fc03-4c3f-9da0-87fd5b8435fe" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_387d7261-fa33-4054-b482-af9c14ad3357" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3382229d-59af-4210-b9c3-e78506f98d87" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_387d7261-fa33-4054-b482-af9c14ad3357" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_387d7261-fa33-4054-b482-af9c14ad3357_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_387d7261-fa33-4054-b482-af9c14ad3357" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_387d7261-fa33-4054-b482-af9c14ad3357_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_5e2af2a8-c76a-431f-a834-d193f59b844e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_387d7261-fa33-4054-b482-af9c14ad3357" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_5e2af2a8-c76a-431f-a834-d193f59b844e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_396f4227-3434-4b9c-9bc4-8de0d6a9800c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_5e2af2a8-c76a-431f-a834-d193f59b844e" xlink:to="loc_us-gaap_SubsequentEventMember_396f4227-3434-4b9c-9bc4-8de0d6a9800c" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/UnitholdersEquityScheduleofStockIssuedtoBoardofDirectorsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#UnitholdersEquityScheduleofStockIssuedtoBoardofDirectorsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/UnitholdersEquityScheduleofStockIssuedtoBoardofDirectorsDetails" xlink:type="extended" id="i4eef48b617ad4fb18a57f496ddc8a09e_UnitholdersEquityScheduleofStockIssuedtoBoardofDirectorsDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionLineItems_73249e40-4e6f-49ab-9126-b852fce372cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ShareBasedNonemployeeServicesTransactionQuantityOfSecuritiesGranted_cc04fb18-c5df-4f2d-a5b5-52a85b772673" xlink:href="mic-20211231.xsd#mic_ShareBasedNonemployeeServicesTransactionQuantityOfSecuritiesGranted"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionLineItems_73249e40-4e6f-49ab-9126-b852fce372cb" xlink:to="loc_mic_ShareBasedNonemployeeServicesTransactionQuantityOfSecuritiesGranted_cc04fb18-c5df-4f2d-a5b5-52a85b772673" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ShareBasedNonemployeeServicesTransactionPriceOfStockUnitsGranted_8e957348-a008-4739-b966-ae466a23d2b8" xlink:href="mic-20211231.xsd#mic_ShareBasedNonemployeeServicesTransactionPriceOfStockUnitsGranted"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionLineItems_73249e40-4e6f-49ab-9126-b852fce372cb" xlink:to="loc_mic_ShareBasedNonemployeeServicesTransactionPriceOfStockUnitsGranted_8e957348-a008-4739-b966-ae466a23d2b8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedGoodsAndNonemployeeServicesTransactionTable_05801a65-d87d-4e91-98ec-16b166a6033b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedGoodsAndNonemployeeServicesTransactionTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionLineItems_73249e40-4e6f-49ab-9126-b852fce372cb" xlink:to="loc_us-gaap_ScheduleOfShareBasedGoodsAndNonemployeeServicesTransactionTable_05801a65-d87d-4e91-98ec-16b166a6033b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_486288d6-4465-4d13-b12a-36a0fc0bc5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedGoodsAndNonemployeeServicesTransactionTable_05801a65-d87d-4e91-98ec-16b166a6033b" xlink:to="loc_us-gaap_PlanNameAxis_486288d6-4465-4d13-b12a-36a0fc0bc5d9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_486288d6-4465-4d13-b12a-36a0fc0bc5d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_486288d6-4465-4d13-b12a-36a0fc0bc5d9" xlink:to="loc_us-gaap_PlanNameDomain_486288d6-4465-4d13-b12a-36a0fc0bc5d9_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_644a1d66-6bda-4b52-8bb6-dd0e9cd11c58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_486288d6-4465-4d13-b12a-36a0fc0bc5d9" xlink:to="loc_us-gaap_PlanNameDomain_644a1d66-6bda-4b52-8bb6-dd0e9cd11c58" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember_67d0d7c0-e619-416d-a699-24eb3c7dc1bb" xlink:href="mic-20211231.xsd#mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_644a1d66-6bda-4b52-8bb6-dd0e9cd11c58" xlink:to="loc_mic_TwentyFourteenIndependentDirectorEquityPlanMemberMemberMember_67d0d7c0-e619-416d-a699-24eb3c7dc1bb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_2b61ec1b-26fb-4950-acf0-0cec3e63fa41" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedGoodsAndNonemployeeServicesTransactionTable_05801a65-d87d-4e91-98ec-16b166a6033b" xlink:to="loc_us-gaap_AwardDateAxis_2b61ec1b-26fb-4950-acf0-0cec3e63fa41" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_2b61ec1b-26fb-4950-acf0-0cec3e63fa41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_2b61ec1b-26fb-4950-acf0-0cec3e63fa41" xlink:to="loc_us-gaap_AwardDateDomain_2b61ec1b-26fb-4950-acf0-0cec3e63fa41_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_2b61ec1b-26fb-4950-acf0-0cec3e63fa41" xlink:to="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RangeThreeMember_70101f43-41bf-44aa-8d31-55ad6f8dc36e" xlink:href="mic-20211231.xsd#mic_RangeThreeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:to="loc_mic_RangeThreeMember_70101f43-41bf-44aa-8d31-55ad6f8dc36e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RangeFourMember_cc000570-ab7e-47f4-8fda-92e4f1214a20" xlink:href="mic-20211231.xsd#mic_RangeFourMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:to="loc_mic_RangeFourMember_cc000570-ab7e-47f4-8fda-92e4f1214a20" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RangeFiveMember_f4c99cb8-a2c0-40d4-8a45-d78c904d490b" xlink:href="mic-20211231.xsd#mic_RangeFiveMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:to="loc_mic_RangeFiveMember_f4c99cb8-a2c0-40d4-8a45-d78c904d490b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RangeSixMember_3422573d-595f-4d4f-90ef-21fce7e7e493" xlink:href="mic-20211231.xsd#mic_RangeSixMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AwardDateDomain_5b1025d9-6196-498e-b5a8-be35c2fd1a03" xlink:to="loc_mic_RangeSixMember_3422573d-595f-4d4f-90ef-21fce7e7e493" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/UnitholdersEquityScheduleofUnvestedStockUnitDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#UnitholdersEquityScheduleofUnvestedStockUnitDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/UnitholdersEquityScheduleofUnvestedStockUnitDetails" xlink:type="extended" id="i89562ec675c94e488b028c9f6679480b_UnitholdersEquityScheduleofUnvestedStockUnitDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df6f63de-fab6-41b1-b92d-aeb6a8f5f9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df6f63de-fab6-41b1-b92d-aeb6a8f5f9d2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ef8c4691-3175-4a4a-b4d4-be700ce8f5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ef8c4691-3175-4a4a-b4d4-be700ce8f5a8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_71f145e1-6b39-473e-9e86-eef3fb00f8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_71f145e1-6b39-473e-9e86-eef3fb00f8ca" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_64277db8-b787-4517-b7b3-b3c0a8fe9f10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_64277db8-b787-4517-b7b3-b3c0a8fe9f10" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f59a2069-29c8-46c8-9c8b-cd3627bfe9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_0a794bd2-28da-4416-848f-90d85927f662" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f59a2069-29c8-46c8-9c8b-cd3627bfe9d5" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8c038856-328b-4f97-82d9-0c605e661256" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df6f63de-fab6-41b1-b92d-aeb6a8f5f9d2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ec200522-e588-405e-b8c3-062ce55fe443" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ec200522-e588-405e-b8c3-062ce55fe443" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a365ed5a-2353-49e2-ada3-92b6e68d2d60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a365ed5a-2353-49e2-ada3-92b6e68d2d60" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_bc2c056f-a0ee-4d1c-8ff4-b4fe806bef91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_bc2c056f-a0ee-4d1c-8ff4-b4fe806bef91" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_22572224-5b37-48e4-acbc-2b0c592e2a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_aa775756-06e7-447c-98ea-d0ee822df46e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_22572224-5b37-48e4-acbc-2b0c592e2a4c" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_44624874-cf79-498a-ac96-8b1d32256f09" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6cb5f093-e987-4d75-ae56-2a10bc06c6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_df6f63de-fab6-41b1-b92d-aeb6a8f5f9d2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6cb5f093-e987-4d75-ae56-2a10bc06c6f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_10a60551-ccf2-4fa9-ac95-b1c8865d8595" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6cb5f093-e987-4d75-ae56-2a10bc06c6f5" xlink:to="loc_us-gaap_AwardTypeAxis_10a60551-ccf2-4fa9-ac95-b1c8865d8595" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10a60551-ccf2-4fa9-ac95-b1c8865d8595_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_10a60551-ccf2-4fa9-ac95-b1c8865d8595" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10a60551-ccf2-4fa9-ac95-b1c8865d8595_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_35b4d0f8-df73-481f-93fa-4c7e819ac242" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_10a60551-ccf2-4fa9-ac95-b1c8865d8595" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_35b4d0f8-df73-481f-93fa-4c7e819ac242" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6a63b4d8-a3ec-4720-bc76-a838f868c70b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_35b4d0f8-df73-481f-93fa-4c7e819ac242" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6a63b4d8-a3ec-4720-bc76-a838f868c70b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsMember_135944f6-af34-4947-9c0c-14db70bce480" xlink:href="mic-20211231.xsd#mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_6a63b4d8-a3ec-4720-bc76-a838f868c70b" xlink:to="loc_mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsMember_135944f6-af34-4947-9c0c-14db70bce480" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeGrantRelatedToAtlanticAviationTransactionRestrictedStockUnitsMember_daf811f1-fca3-4d34-8537-7a3e0b362029" xlink:href="mic-20211231.xsd#mic_MakeWholeGrantRelatedToAtlanticAviationTransactionRestrictedStockUnitsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_6a63b4d8-a3ec-4720-bc76-a838f868c70b" xlink:to="loc_mic_MakeWholeGrantRelatedToAtlanticAviationTransactionRestrictedStockUnitsMember_daf811f1-fca3-4d34-8537-7a3e0b362029" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RestrictedStockUnitsSpecialGrantsMember_1fc98d7e-925f-4b79-bf59-581f149d193a" xlink:href="mic-20211231.xsd#mic_RestrictedStockUnitsSpecialGrantsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_35b4d0f8-df73-481f-93fa-4c7e819ac242" xlink:to="loc_mic_RestrictedStockUnitsSpecialGrantsMember_1fc98d7e-925f-4b79-bf59-581f149d193a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsSpecialGrantsMember_f8411236-e963-4dd8-b611-b186d6c24e67" xlink:href="mic-20211231.xsd#mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsSpecialGrantsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_RestrictedStockUnitsSpecialGrantsMember_1fc98d7e-925f-4b79-bf59-581f149d193a" xlink:to="loc_mic_MakeWholeGrantForSpecialDividendRestrictedStockUnitsSpecialGrantsMember_f8411236-e963-4dd8-b611-b186d6c24e67" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_295c569c-f144-4f91-9c80-f5eb75c7a50e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_35b4d0f8-df73-481f-93fa-4c7e819ac242" xlink:to="loc_us-gaap_PerformanceSharesMember_295c569c-f144-4f91-9c80-f5eb75c7a50e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeGrantForSpecialDividendPerformanceSharesMember_46dc76c8-8fb4-473f-ad70-863f32779dda" xlink:href="mic-20211231.xsd#mic_MakeWholeGrantForSpecialDividendPerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_295c569c-f144-4f91-9c80-f5eb75c7a50e" xlink:to="loc_mic_MakeWholeGrantForSpecialDividendPerformanceSharesMember_46dc76c8-8fb4-473f-ad70-863f32779dda" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MakeWholeGrantRelatedToAtlanticAviationTransactionPerformanceSharesMember_8e969b7f-6726-4539-9023-a5b66ffa3164" xlink:href="mic-20211231.xsd#mic_MakeWholeGrantRelatedToAtlanticAviationTransactionPerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PerformanceSharesMember_295c569c-f144-4f91-9c80-f5eb75c7a50e" xlink:to="loc_mic_MakeWholeGrantRelatedToAtlanticAviationTransactionPerformanceSharesMember_8e969b7f-6726-4539-9023-a5b66ffa3164" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_6e73a604-0ad1-4a25-88fd-72fb41ece4d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6cb5f093-e987-4d75-ae56-2a10bc06c6f5" xlink:to="loc_us-gaap_PlanNameAxis_6e73a604-0ad1-4a25-88fd-72fb41ece4d9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_6e73a604-0ad1-4a25-88fd-72fb41ece4d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_6e73a604-0ad1-4a25-88fd-72fb41ece4d9" xlink:to="loc_us-gaap_PlanNameDomain_6e73a604-0ad1-4a25-88fd-72fb41ece4d9_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_c54e5efc-1186-4d93-a445-e07d12ab1a12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_6e73a604-0ad1-4a25-88fd-72fb41ece4d9" xlink:to="loc_us-gaap_PlanNameDomain_c54e5efc-1186-4d93-a445-e07d12ab1a12" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwoThousandNineteenShortTermIncentivePlanMember_f309cbaf-8172-44b4-91f6-89b9cb4cec9a" xlink:href="mic-20211231.xsd#mic_TwoThousandNineteenShortTermIncentivePlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_c54e5efc-1186-4d93-a445-e07d12ab1a12" xlink:to="loc_mic_TwoThousandNineteenShortTermIncentivePlanMember_f309cbaf-8172-44b4-91f6-89b9cb4cec9a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_TwoThousandNineteenLongTermIncentivePlanMember_24bfb8ef-af00-4a80-8392-8fcbdf8724bc" xlink:href="mic-20211231.xsd#mic_TwoThousandNineteenLongTermIncentivePlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_c54e5efc-1186-4d93-a445-e07d12ab1a12" xlink:to="loc_mic_TwoThousandNineteenLongTermIncentivePlanMember_24bfb8ef-af00-4a80-8392-8fcbdf8724bc" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/UnitholdersEquityScheduleofAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#UnitholdersEquityScheduleofAccumulatedOtherComprehensiveLossDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/UnitholdersEquityScheduleofAccumulatedOtherComprehensiveLossDetails" xlink:type="extended" id="i16d1cc6776214fc581e63659887340be_UnitholdersEquityScheduleofAccumulatedOtherComprehensiveLossDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_72414fdd-81a8-428a-8bbb-9113d7fd9560" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_72414fdd-81a8-428a-8bbb-9113d7fd9560" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_72481905-8fae-47fb-b923-b6c397614c7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_72481905-8fae-47fb-b923-b6c397614c7f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_69b2a967-883b-46a5-a202-7390c0a2a39e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_69b2a967-883b-46a5-a202-7390c0a2a39e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_6ddb4891-7dce-4cfb-a105-d2141f70590c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_6ddb4891-7dce-4cfb-a105-d2141f70590c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_84bd8498-6beb-4366-9e75-db14d47ff04f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_68f7d7aa-3144-4780-8652-97579f5be6f4" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_84bd8498-6beb-4366-9e75-db14d47ff04f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_02cb193a-8a8c-47dd-a173-17bfb3dc3275" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_ce8f096a-8ede-4247-b48e-0aa3b0c1b40e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_72414fdd-81a8-428a-8bbb-9113d7fd9560" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_ce8f096a-8ede-4247-b48e-0aa3b0c1b40e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_a09191fe-d5aa-4bf0-9333-e87f001159d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_72414fdd-81a8-428a-8bbb-9113d7fd9560" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_a09191fe-d5aa-4bf0-9333-e87f001159d1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_697daf74-e190-47ea-a392-c58cf67d8d09" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_72414fdd-81a8-428a-8bbb-9113d7fd9560" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_697daf74-e190-47ea-a392-c58cf67d8d09" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_388e3e71-4dee-4214-893e-461e5bcd9d15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_697daf74-e190-47ea-a392-c58cf67d8d09" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_388e3e71-4dee-4214-893e-461e5bcd9d15" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_388e3e71-4dee-4214-893e-461e5bcd9d15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_388e3e71-4dee-4214-893e-461e5bcd9d15" xlink:to="loc_us-gaap_EquityComponentDomain_388e3e71-4dee-4214-893e-461e5bcd9d15_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4675fc76-4739-46cb-9107-1bc6ad9517ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_388e3e71-4dee-4214-893e-461e5bcd9d15" xlink:to="loc_us-gaap_EquityComponentDomain_4675fc76-4739-46cb-9107-1bc6ad9517ec" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a66902c1-6887-4b1c-b6a1-a5a6768b1b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4675fc76-4739-46cb-9107-1bc6ad9517ec" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a66902c1-6887-4b1c-b6a1-a5a6768b1b2f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_8d97de74-ad74-46b3-84b3-bdc7ff0ea521" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a66902c1-6887-4b1c-b6a1-a5a6768b1b2f" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_8d97de74-ad74-46b3-84b3-bdc7ff0ea521" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_ab2f81e9-d1f7-4150-8458-5502bf6b3996" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a66902c1-6887-4b1c-b6a1-a5a6768b1b2f" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_ab2f81e9-d1f7-4150-8458-5502bf6b3996" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#RevenueRecognitionNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" id="ia51877ceeaba4887811670959f2500c4_RevenueRecognitionNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_260d7ff9-430e-46f1-a78f-05425c06075d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfSolarProjects_341cd267-1871-4e30-89bb-3ae8522b4868" xlink:href="mic-20211231.xsd#mic_NumberOfSolarProjects"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_260d7ff9-430e-46f1-a78f-05425c06075d" xlink:to="loc_mic_NumberOfSolarProjects_341cd267-1871-4e30-89bb-3ae8522b4868" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_InvestmentProjectEstimatedLifeTerm_887723b6-353f-475f-800c-d2108c7bc071" xlink:href="mic-20211231.xsd#mic_InvestmentProjectEstimatedLifeTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_260d7ff9-430e-46f1-a78f-05425c06075d" xlink:to="loc_mic_InvestmentProjectEstimatedLifeTerm_887723b6-353f-475f-800c-d2108c7bc071" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_254fda38-5a61-436f-8191-d54cbf8ae173" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_260d7ff9-430e-46f1-a78f-05425c06075d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_254fda38-5a61-436f-8191-d54cbf8ae173" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_09bdf170-b980-44dd-a77b-1901356455d3" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_254fda38-5a61-436f-8191-d54cbf8ae173" xlink:to="loc_dei_LegalEntityAxis_09bdf170-b980-44dd-a77b-1901356455d3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_09bdf170-b980-44dd-a77b-1901356455d3_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_09bdf170-b980-44dd-a77b-1901356455d3" xlink:to="loc_dei_EntityDomain_09bdf170-b980-44dd-a77b-1901356455d3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_78d2e74e-666d-4232-99be-83763a810a0b" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_09bdf170-b980-44dd-a77b-1901356455d3" xlink:to="loc_dei_EntityDomain_78d2e74e-666d-4232-99be-83763a810a0b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MICHawaiiHoldingsLLCMember_b74cea60-2105-42dd-bca4-f89c4c6cb494" xlink:href="mic-20211231.xsd#mic_MICHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_78d2e74e-666d-4232-99be-83763a810a0b" xlink:to="loc_mic_MICHawaiiHoldingsLLCMember_b74cea60-2105-42dd-bca4-f89c4c6cb494" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_56bf0566-6485-4e2c-8113-918c7f1a04dc" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_254fda38-5a61-436f-8191-d54cbf8ae173" xlink:to="loc_srt_RangeAxis_56bf0566-6485-4e2c-8113-918c7f1a04dc" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_56bf0566-6485-4e2c-8113-918c7f1a04dc_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_56bf0566-6485-4e2c-8113-918c7f1a04dc" xlink:to="loc_srt_RangeMember_56bf0566-6485-4e2c-8113-918c7f1a04dc_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6d08caf7-e046-4e96-bbb8-be1de4c6b6a2" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_56bf0566-6485-4e2c-8113-918c7f1a04dc" xlink:to="loc_srt_RangeMember_6d08caf7-e046-4e96-bbb8-be1de4c6b6a2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_379af517-7c09-43fd-97f2-1d6584f45a4a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6d08caf7-e046-4e96-bbb8-be1de4c6b6a2" xlink:to="loc_srt_MinimumMember_379af517-7c09-43fd-97f2-1d6584f45a4a" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/RevenueRecognitionScheduleofRevenuefromExternalCustomersDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#RevenueRecognitionScheduleofRevenuefromExternalCustomersDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/RevenueRecognitionScheduleofRevenuefromExternalCustomersDetails" xlink:type="extended" id="i1a9cab6b67b74a2497447f95b8fdb82b_RevenueRecognitionScheduleofRevenuefromExternalCustomersDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_40defba1-d4f4-42b5-9c42-47fabf3addeb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c796fccb-97d0-4423-843b-214e512b80ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_40defba1-d4f4-42b5-9c42-47fabf3addeb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c796fccb-97d0-4423-843b-214e512b80ae" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_dc3bb253-1d14-4468-97c5-3a71696b3589" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_40defba1-d4f4-42b5-9c42-47fabf3addeb" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_dc3bb253-1d14-4468-97c5-3a71696b3589" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_dc3bb253-1d14-4468-97c5-3a71696b3589" xlink:to="loc_srt_ProductOrServiceAxis_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b" xlink:to="loc_srt_ProductsAndServicesDomain_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d406d27d-9dd7-478e-bd18-2e1243d993c9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7b297c3e-6096-4f5c-9b82-0ee4d9feaa0b" xlink:to="loc_srt_ProductsAndServicesDomain_d406d27d-9dd7-478e-bd18-2e1243d993c9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LeaseProductMember_431f8c53-4813-43b6-bc4c-65a056b31241" xlink:href="mic-20211231.xsd#mic_LeaseProductMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d406d27d-9dd7-478e-bd18-2e1243d993c9" xlink:to="loc_mic_LeaseProductMember_431f8c53-4813-43b6-bc4c-65a056b31241" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_GasProductMember_91fc4801-7b25-4f9c-b79e-676ff5446cb8" xlink:href="mic-20211231.xsd#mic_GasProductMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d406d27d-9dd7-478e-bd18-2e1243d993c9" xlink:to="loc_mic_GasProductMember_91fc4801-7b25-4f9c-b79e-676ff5446cb8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_OtherProductMember_2c28595d-2ca5-4167-bee8-61f2b7f4d34c" xlink:href="mic-20211231.xsd#mic_OtherProductMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d406d27d-9dd7-478e-bd18-2e1243d993c9" xlink:to="loc_mic_OtherProductMember_2c28595d-2ca5-4167-bee8-61f2b7f4d34c" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#RelatedPartyTransactionsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="extended" id="i23c1e788c65143a7b7301437dd6a31da_RelatedPartyTransactionsNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfSharesHeldByManagerRelatedParty_93a042ff-1c9c-480c-94bc-4f1e79d300c8" xlink:href="mic-20211231.xsd#mic_NumberOfSharesHeldByManagerRelatedParty"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_NumberOfSharesHeldByManagerRelatedParty_93a042ff-1c9c-480c-94bc-4f1e79d300c8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageOfSharesHeldByManagerRelatedParty_fcbd879c-6216-4894-9110-a3f7c306d75c" xlink:href="mic-20211231.xsd#mic_PercentageOfSharesHeldByManagerRelatedParty"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_PercentageOfSharesHeldByManagerRelatedParty_fcbd879c-6216-4894-9110-a3f7c306d75c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BaseManagementFeeToManagerRelatedPartySettledInShares_9598c1f8-e689-48e3-a076-839298de1f4e" xlink:href="mic-20211231.xsd#mic_BaseManagementFeeToManagerRelatedPartySettledInShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_BaseManagementFeeToManagerRelatedPartySettledInShares_9598c1f8-e689-48e3-a076-839298de1f4e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash_9c1d2d63-5c6a-47e7-b34f-1e54cbc4e95c" xlink:href="mic-20211231.xsd#mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash_9c1d2d63-5c6a-47e7-b34f-1e54cbc4e95c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PercentageOfCapOnEquityMarketCapitalizationOnBaseManagementFee_22d3b801-e6fb-4003-aff4-05760c3d3f04" xlink:href="mic-20211231.xsd#mic_PercentageOfCapOnEquityMarketCapitalizationOnBaseManagementFee"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_PercentageOfCapOnEquityMarketCapitalizationOnBaseManagementFee_22d3b801-e6fb-4003-aff4-05760c3d3f04" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_RelatedPartyTransactionNoticePeriod_b286fbb6-3c9b-488c-a169-68445b830feb" xlink:href="mic-20211231.xsd#mic_RelatedPartyTransactionNoticePeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_RelatedPartyTransactionNoticePeriod_b286fbb6-3c9b-488c-a169-68445b830feb" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementPercentageOfNetProceedsDueUponSaleorSalesofBusinesses_0db1df62-601e-4c53-91e4-3a15b2e21a8a" xlink:href="mic-20211231.xsd#mic_DispositionAgreementPercentageOfNetProceedsDueUponSaleorSalesofBusinesses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementPercentageOfNetProceedsDueUponSaleorSalesofBusinesses_0db1df62-601e-4c53-91e4-3a15b2e21a8a" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementQualifyingTerminationEventMinimumDueUponSaleorSalesofBusinesses_1aa4fa88-374b-4ea8-9fae-4f0b8417e24a" xlink:href="mic-20211231.xsd#mic_DispositionAgreementQualifyingTerminationEventMinimumDueUponSaleorSalesofBusinesses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementQualifyingTerminationEventMinimumDueUponSaleorSalesofBusinesses_1aa4fa88-374b-4ea8-9fae-4f0b8417e24a" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementQualifyingTerminationEventPercentageAppliedAboveThreshold_6d4d9127-9c87-4502-840d-fafafabe5981" xlink:href="mic-20211231.xsd#mic_DispositionAgreementQualifyingTerminationEventPercentageAppliedAboveThreshold"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementQualifyingTerminationEventPercentageAppliedAboveThreshold_6d4d9127-9c87-4502-840d-fafafabe5981" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementQualifyingTerminationEventThresholdNetProceeds_f313a914-1cc6-479a-b3ab-b70a6f2498ed" xlink:href="mic-20211231.xsd#mic_DispositionAgreementQualifyingTerminationEventThresholdNetProceeds"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementQualifyingTerminationEventThresholdNetProceeds_f313a914-1cc6-479a-b3ab-b70a6f2498ed" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementPotentialExtensionPeriodforAdditionalPaymentSubjecttoQualifyingTerminationEventOccurringonorPriortoJanuary12022_efdd7819-ba00-4d9c-99be-c4622033963c" xlink:href="mic-20211231.xsd#mic_DispositionAgreementPotentialExtensionPeriodforAdditionalPaymentSubjecttoQualifyingTerminationEventOccurringonorPriortoJanuary12022"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementPotentialExtensionPeriodforAdditionalPaymentSubjecttoQualifyingTerminationEventOccurringonorPriortoJanuary12022_efdd7819-ba00-4d9c-99be-c4622033963c" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ManagerDispositionAgreementQualifyingTerminationEventAdditionalPayment_4097f1f2-07fc-4043-9ea8-025e863f0ac1" xlink:href="mic-20211231.xsd#mic_ManagerDispositionAgreementQualifyingTerminationEventAdditionalPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_ManagerDispositionAgreementQualifyingTerminationEventAdditionalPayment_4097f1f2-07fc-4043-9ea8-025e863f0ac1" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementMinimumManagementFeeforYearsOneandTwo_632e1160-5252-4077-a4d3-118036ec76a5" xlink:href="mic-20211231.xsd#mic_DispositionAgreementMinimumManagementFeeforYearsOneandTwo"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementMinimumManagementFeeforYearsOneandTwo_632e1160-5252-4077-a4d3-118036ec76a5" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementPeriodMinimumManagementFeeforYearsOneandTwo_1f2eaafc-c0d3-463f-8607-fbfee597c4ac" xlink:href="mic-20211231.xsd#mic_DispositionAgreementPeriodMinimumManagementFeeforYearsOneandTwo"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementPeriodMinimumManagementFeeforYearsOneandTwo_1f2eaafc-c0d3-463f-8607-fbfee597c4ac" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementMinimumManagementFeeforYearsThreethroughSix_757a0c4b-0a34-4380-855b-2456d045ab38" xlink:href="mic-20211231.xsd#mic_DispositionAgreementMinimumManagementFeeforYearsThreethroughSix"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementMinimumManagementFeeforYearsThreethroughSix_757a0c4b-0a34-4380-855b-2456d045ab38" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DispositionAgreementRecaptureAmountofPreviouslyWaivedManagementFees_76ab50de-4d67-4d79-b511-a87105c62553" xlink:href="mic-20211231.xsd#mic_DispositionAgreementRecaptureAmountofPreviouslyWaivedManagementFees"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DispositionAgreementRecaptureAmountofPreviouslyWaivedManagementFees_76ab50de-4d67-4d79-b511-a87105c62553" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_80acca5f-5d93-47cf-a309-b6a101a70db8" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationDispositionPayment_80acca5f-5d93-47cf-a309-b6a101a70db8" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupIncludingDiscontinuedOperationAdditionalDispositionPayment_41037be5-12ff-42be-99e7-fc4ff2a97682" xlink:href="mic-20211231.xsd#mic_DisposalGroupIncludingDiscontinuedOperationAdditionalDispositionPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_DisposalGroupIncludingDiscontinuedOperationAdditionalDispositionPayment_41037be5-12ff-42be-99e7-fc4ff2a97682" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_15bf8a7a-6448-4885-9fad-66a75f7f459d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_15bf8a7a-6448-4885-9fad-66a75f7f459d" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalFees_3f85e96d-e03b-46a9-831b-fc7528a7e1d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LegalFees"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_LegalFees_3f85e96d-e03b-46a9-831b-fc7528a7e1d8" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LegalFeeCredit_22ea05d4-4fcd-4552-93b3-e6c06be24bae" xlink:href="mic-20211231.xsd#mic_LegalFeeCredit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_mic_LegalFeeCredit_22ea05d4-4fcd-4552-93b3-e6c06be24bae" xlink:type="arc" order="20"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_77ee9445-f49c-4ce2-a96b-c5243eb9cf8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_77ee9445-f49c-4ce2-a96b-c5243eb9cf8a" xlink:type="arc" order="21"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a80cc111-149a-491d-9509-227c4c5525dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_a80cc111-149a-491d-9509-227c4c5525dc" xlink:type="arc" order="22"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsIncurred_839d39e6-65b7-4bb2-b43b-1aaf21facab8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestCostsIncurred"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_InterestCostsIncurred_839d39e6-65b7-4bb2-b43b-1aaf21facab8" xlink:type="arc" order="23"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_11a2dfc6-247e-4228-b09f-c57ca694cd03" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5dee5773-6829-407f-bbbc-68dace553bc7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5dee5773-6829-407f-bbbc-68dace553bc7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_5dee5773-6829-407f-bbbc-68dace553bc7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5dee5773-6829-407f-bbbc-68dace553bc7" xlink:to="loc_us-gaap_RelatedPartyDomain_5dee5773-6829-407f-bbbc-68dace553bc7_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_d0749d55-3b0c-4cbc-8e8b-90b02d51015b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5dee5773-6829-407f-bbbc-68dace553bc7" xlink:to="loc_us-gaap_RelatedPartyDomain_d0749d55-3b0c-4cbc-8e8b-90b02d51015b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ManagementMember_e0a5f85f-c27c-40e3-a1cb-3176885fdcdd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ManagementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_d0749d55-3b0c-4cbc-8e8b-90b02d51015b" xlink:to="loc_srt_ManagementMember_e0a5f85f-c27c-40e3-a1cb-3176885fdcdd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MacquarieCapitalFundingLlcMember_cff8293d-9a0c-48a6-965b-6a03e2416441" xlink:href="mic-20211231.xsd#mic_MacquarieCapitalFundingLlcMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_d0749d55-3b0c-4cbc-8e8b-90b02d51015b" xlink:to="loc_mic_MacquarieCapitalFundingLlcMember_cff8293d-9a0c-48a6-965b-6a03e2416441" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_FormerBoardOfDirectorMember_05ccfb70-52b7-458c-bd66-b0298bc88e41" xlink:href="mic-20211231.xsd#mic_FormerBoardOfDirectorMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_d0749d55-3b0c-4cbc-8e8b-90b02d51015b" xlink:to="loc_mic_FormerBoardOfDirectorMember_05ccfb70-52b7-458c-bd66-b0298bc88e41" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_522a48ae-02d0-4c8e-bfed-64db09792cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_us-gaap_CreditFacilityAxis_522a48ae-02d0-4c8e-bfed-64db09792cc2" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_522a48ae-02d0-4c8e-bfed-64db09792cc2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_522a48ae-02d0-4c8e-bfed-64db09792cc2" xlink:to="loc_us-gaap_CreditFacilityDomain_522a48ae-02d0-4c8e-bfed-64db09792cc2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b6748b86-14d1-437f-afdb-26d96e99b0de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_522a48ae-02d0-4c8e-bfed-64db09792cc2" xlink:to="loc_us-gaap_CreditFacilityDomain_b6748b86-14d1-437f-afdb-26d96e99b0de" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_81550255-38ca-4fbc-b876-967311500e73" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_b6748b86-14d1-437f-afdb-26d96e99b0de" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_81550255-38ca-4fbc-b876-967311500e73" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_e3f35d2a-b1aa-4303-b9af-42398d67dea4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_e3f35d2a-b1aa-4303-b9af-42398d67dea4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_e3f35d2a-b1aa-4303-b9af-42398d67dea4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_e3f35d2a-b1aa-4303-b9af-42398d67dea4" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_e3f35d2a-b1aa-4303-b9af-42398d67dea4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_19e4963d-dbaf-4a6c-bf70-5b133e3d39e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_e3f35d2a-b1aa-4303-b9af-42398d67dea4" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_19e4963d-dbaf-4a6c-bf70-5b133e3d39e2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AdvisoryServicesMember_cf24ee54-2ce5-4440-b00a-95d19732c183" xlink:href="mic-20211231.xsd#mic_AdvisoryServicesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_19e4963d-dbaf-4a6c-bf70-5b133e3d39e2" xlink:to="loc_mic_AdvisoryServicesMember_cf24ee54-2ce5-4440-b00a-95d19732c183" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2c68a72b-8cd5-412f-9e32-ce4b1b053eff" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_srt_RangeAxis_2c68a72b-8cd5-412f-9e32-ce4b1b053eff" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2c68a72b-8cd5-412f-9e32-ce4b1b053eff_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2c68a72b-8cd5-412f-9e32-ce4b1b053eff" xlink:to="loc_srt_RangeMember_2c68a72b-8cd5-412f-9e32-ce4b1b053eff_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4007845d-b90c-48b6-8424-0840ce99935b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2c68a72b-8cd5-412f-9e32-ce4b1b053eff" xlink:to="loc_srt_RangeMember_4007845d-b90c-48b6-8424-0840ce99935b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8b837c51-a4bf-4b75-9c49-63d08c6abae3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4007845d-b90c-48b6-8424-0840ce99935b" xlink:to="loc_srt_MinimumMember_8b837c51-a4bf-4b75-9c49-63d08c6abae3" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3e783a7e-fecc-43cc-b426-4d886aaac09f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4007845d-b90c-48b6-8424-0840ce99935b" xlink:to="loc_srt_MaximumMember_3e783a7e-fecc-43cc-b426-4d886aaac09f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_a706bcf4-45a1-4676-8699-7dec7353b4ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_a706bcf4-45a1-4676-8699-7dec7353b4ba" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_a706bcf4-45a1-4676-8699-7dec7353b4ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_a706bcf4-45a1-4676-8699-7dec7353b4ba" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_a706bcf4-45a1-4676-8699-7dec7353b4ba_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_6cd8c4ec-cf3b-435b-96f0-4cf469d45481" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_a706bcf4-45a1-4676-8699-7dec7353b4ba" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_6cd8c4ec-cf3b-435b-96f0-4cf469d45481" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_52daeb31-9773-4684-a62d-4f4ab50b3666" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_6cd8c4ec-cf3b-435b-96f0-4cf469d45481" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_52daeb31-9773-4684-a62d-4f4ab50b3666" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_c772def3-8c15-4b57-a4ca-4f1bba0c9a58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_6cd8c4ec-cf3b-435b-96f0-4cf469d45481" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_c772def3-8c15-4b57-a4ca-4f1bba0c9a58" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b7e208f1-4e52-4560-9419-4b7acbae4144" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b7e208f1-4e52-4560-9419-4b7acbae4144" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b7e208f1-4e52-4560-9419-4b7acbae4144_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b7e208f1-4e52-4560-9419-4b7acbae4144" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b7e208f1-4e52-4560-9419-4b7acbae4144_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2d433e91-d689-4abf-bcbd-b4a73db60955" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b7e208f1-4e52-4560-9419-4b7acbae4144" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2d433e91-d689-4abf-bcbd-b4a73db60955" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MICHawaiiHoldingsLLCMember_51cb13c8-5acc-41f0-ad46-819ee3aa0b31" xlink:href="mic-20211231.xsd#mic_MICHawaiiHoldingsLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2d433e91-d689-4abf-bcbd-b4a73db60955" xlink:to="loc_mic_MICHawaiiHoldingsLLCMember_51cb13c8-5acc-41f0-ad46-819ee3aa0b31" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationBusinessMember_71f2ddb4-c1a7-4124-a1e0-8f192f5cc5a0" xlink:href="mic-20211231.xsd#mic_AtlanticAviationBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_2d433e91-d689-4abf-bcbd-b4a73db60955" xlink:to="loc_mic_AtlanticAviationBusinessMember_71f2ddb4-c1a7-4124-a1e0-8f192f5cc5a0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateAxis_e0250806-fc60-45ca-b6b6-75ee03f00d56" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_4840fb89-08c3-46b0-ac81-f4cfa6985c11" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateAxis_e0250806-fc60-45ca-b6b6-75ee03f00d56" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateDomain_e0250806-fc60-45ca-b6b6-75ee03f00d56_default" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateAxis_e0250806-fc60-45ca-b6b6-75ee03f00d56" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateDomain_e0250806-fc60-45ca-b6b6-75ee03f00d56_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DisposalGroupForecastedCompletionDateDomain_36263bb3-9879-4f48-8aad-913456e2ee39" xlink:href="mic-20211231.xsd#mic_DisposalGroupForecastedCompletionDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateAxis_e0250806-fc60-45ca-b6b6-75ee03f00d56" xlink:to="loc_mic_DisposalGroupForecastedCompletionDateDomain_36263bb3-9879-4f48-8aad-913456e2ee39" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateAfterJuly12022Member_34eecb2a-64b6-4af4-8a0e-4aedf4251258" xlink:href="mic-20211231.xsd#mic_CompletionDateAfterJuly12022Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateDomain_36263bb3-9879-4f48-8aad-913456e2ee39" xlink:to="loc_mic_CompletionDateAfterJuly12022Member_34eecb2a-64b6-4af4-8a0e-4aedf4251258" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_CompletionDateJuly12022OrEarlierMember_077738ba-7d70-4072-b5f0-3a2de7b944ac" xlink:href="mic-20211231.xsd#mic_CompletionDateJuly12022OrEarlierMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_DisposalGroupForecastedCompletionDateDomain_36263bb3-9879-4f48-8aad-913456e2ee39" xlink:to="loc_mic_CompletionDateJuly12022OrEarlierMember_077738ba-7d70-4072-b5f0-3a2de7b944ac" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/RelatedPartyTransactionsScheduleofBaseManagementFeesandPerformanceFeesDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#RelatedPartyTransactionsScheduleofBaseManagementFeesandPerformanceFeesDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/RelatedPartyTransactionsScheduleofBaseManagementFeesandPerformanceFeesDetails" xlink:type="extended" id="if28538bb18fe4cfcab40c7f01790298b_RelatedPartyTransactionsScheduleofBaseManagementFeesandPerformanceFeesDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_BaseManagementFeeToManagerRelatedPartySettledInShares_05c2c431-a6ca-4c67-a33b-b6c590ce57ed" xlink:href="mic-20211231.xsd#mic_BaseManagementFeeToManagerRelatedPartySettledInShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:to="loc_mic_BaseManagementFeeToManagerRelatedPartySettledInShares_05c2c431-a6ca-4c67-a33b-b6c590ce57ed" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash_759effef-1353-4df6-a556-9582f9944cf9" xlink:href="mic-20211231.xsd#mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:to="loc_mic_PerformanceFeeToManagerRelatedPartySettledInSharesAndOrCash_759effef-1353-4df6-a556-9582f9944cf9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfUnitsIssuedToManagerForBaseManagementPerformanceFees_39b3ffc1-c4d2-4130-9738-4c3a77fa7fa0" xlink:href="mic-20211231.xsd#mic_NumberOfUnitsIssuedToManagerForBaseManagementPerformanceFees"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:to="loc_mic_NumberOfUnitsIssuedToManagerForBaseManagementPerformanceFees_39b3ffc1-c4d2-4130-9738-4c3a77fa7fa0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_NumberOfUnitsIssuedSubsequentToFiscalPeriodForBaseManagementFeesToManager_32ff54f8-0a34-47df-b2e5-df4662a4d444" xlink:href="mic-20211231.xsd#mic_NumberOfUnitsIssuedSubsequentToFiscalPeriodForBaseManagementFeesToManager"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:to="loc_mic_NumberOfUnitsIssuedSubsequentToFiscalPeriodForBaseManagementFeesToManager_32ff54f8-0a34-47df-b2e5-df4662a4d444" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_77076bd8-2440-44c6-8a9c-65d0e4e200cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_8b3ad8d6-5e2d-4360-a4f5-aa41fc395d1e" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_77076bd8-2440-44c6-8a9c-65d0e4e200cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_77076bd8-2440-44c6-8a9c-65d0e4e200cf" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02" xlink:to="loc_us-gaap_RelatedPartyDomain_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_f7822082-7e94-4bc3-aec8-a739b0d5c6dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_0a19ef07-84e9-44fc-8bc9-fa2a75dabf02" xlink:to="loc_us-gaap_RelatedPartyDomain_f7822082-7e94-4bc3-aec8-a739b0d5c6dc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ManagementMember_3ae4772e-9d32-45f9-8110-fb6c6b687a0e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ManagementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_f7822082-7e94-4bc3-aec8-a739b0d5c6dc" xlink:to="loc_srt_ManagementMember_3ae4772e-9d32-45f9-8110-fb6c6b687a0e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_8407edc9-a050-481c-99f5-22d4ac181b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_77076bd8-2440-44c6-8a9c-65d0e4e200cf" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_8407edc9-a050-481c-99f5-22d4ac181b4d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_8407edc9-a050-481c-99f5-22d4ac181b4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8407edc9-a050-481c-99f5-22d4ac181b4d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_8407edc9-a050-481c-99f5-22d4ac181b4d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_59436fd9-6915-4dad-9f72-a1cff5327170" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8407edc9-a050-481c-99f5-22d4ac181b4d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_59436fd9-6915-4dad-9f72-a1cff5327170" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_ff9630cb-4f3c-4a06-8442-e11893941c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_59436fd9-6915-4dad-9f72-a1cff5327170" xlink:to="loc_us-gaap_SubsequentEventMember_ff9630cb-4f3c-4a06-8442-e11893941c2d" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="extended" id="i58778c7c4d5b438fa56b249a1be1e3d4_EmployeeBenefitPlansNarrativeDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_8553d744-a134-4cb5-8d4d-28eb22602f0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_8553d744-a134-4cb5-8d4d-28eb22602f0f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedContributionPlanEmployerMatchingContribution_dfd22db8-8365-464c-aadf-a0ef3c94c6b0" xlink:href="mic-20211231.xsd#mic_DefinedContributionPlanEmployerMatchingContribution"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedContributionPlanEmployerMatchingContribution_dfd22db8-8365-464c-aadf-a0ef3c94c6b0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanPeriodToIncreasePlanParticipantBenefits_4de83dac-b561-4b71-9f13-46c9f7586708" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanPeriodToIncreasePlanParticipantBenefits"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedBenefitPlanPeriodToIncreasePlanParticipantBenefits_4de83dac-b561-4b71-9f13-46c9f7586708" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanEmployeeHighestAverageCompensationPeriod_7e605b46-269c-46b8-9f34-e8f18f0c4fc9" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanEmployeeHighestAverageCompensationPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedBenefitPlanEmployeeHighestAverageCompensationPeriod_7e605b46-269c-46b8-9f34-e8f18f0c4fc9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedContributionPlanFinalYearCompensationPercentage_f2779abb-acd6-4b7f-9c8a-242ebc64795b" xlink:href="mic-20211231.xsd#mic_DefinedContributionPlanFinalYearCompensationPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedContributionPlanFinalYearCompensationPercentage_f2779abb-acd6-4b7f-9c8a-242ebc64795b" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedContributionPlanFinalYearCompensationMaximumAmount_c63fee1e-8e9e-4d9e-ad86-c4f6b36f322f" xlink:href="mic-20211231.xsd#mic_DefinedContributionPlanFinalYearCompensationMaximumAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedContributionPlanFinalYearCompensationMaximumAmount_c63fee1e-8e9e-4d9e-ad86-c4f6b36f322f" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanEarlyRetirementAge_a2bbee22-5712-432a-be8c-9298858794f4" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanEarlyRetirementAge"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedBenefitPlanEarlyRetirementAge_a2bbee22-5712-432a-be8c-9298858794f4" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MaximumAgeForWhichBusinessPaysMedicalPremiumOfTheRetireesAndSpouses_45230f56-fb96-41de-ad27-2ae00c09b7d9" xlink:href="mic-20211231.xsd#mic_MaximumAgeForWhichBusinessPaysMedicalPremiumOfTheRetireesAndSpouses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_MaximumAgeForWhichBusinessPaysMedicalPremiumOfTheRetireesAndSpouses_45230f56-fb96-41de-ad27-2ae00c09b7d9" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanRetirementAgeMinimum_17bd02d0-0385-4ac5-8d10-a33f459cccea" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanRetirementAgeMinimum"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedBenefitPlanRetirementAgeMinimum_17bd02d0-0385-4ac5-8d10-a33f459cccea" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedContributionPlanMinimumServicePeriodForEligibleToParticipate_502f56e1-5f0e-424e-9ad2-0391b6b17c33" xlink:href="mic-20211231.xsd#mic_DefinedContributionPlanMinimumServicePeriodForEligibleToParticipate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_DefinedContributionPlanMinimumServicePeriodForEligibleToParticipate_502f56e1-5f0e-424e-9ad2-0391b6b17c33" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_MedicalPremiumsPayment_e5de1907-480f-4924-abf2-968434b73d00" xlink:href="mic-20211231.xsd#mic_MedicalPremiumsPayment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_MedicalPremiumsPayment_e5de1907-480f-4924-abf2-968434b73d00" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_LifeinsuranceContractsDeathBenefitsToInsured_4a4a23a6-62e9-441e-946e-351e5dcf601e" xlink:href="mic-20211231.xsd#mic_LifeinsuranceContractsDeathBenefitsToInsured"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_mic_LifeinsuranceContractsDeathBenefitsToInsured_4a4a23a6-62e9-441e-946e-351e5dcf601e" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_76cf45f3-9dd6-4139-adf1-cca7349a3db0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_76cf45f3-9dd6-4139-adf1-cca7349a3db0" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_cbd0e2b0-399f-422a-b99f-ce48232241de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_cbd0e2b0-399f-422a-b99f-ce48232241de" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_ba1817ac-8aa5-4ce9-9572-d98267bba95f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_ba1817ac-8aa5-4ce9-9572-d98267bba95f" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_89149199-b6ba-4dc1-a9a2-a09404295c25" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_89149199-b6ba-4dc1-a9a2-a09404295c25" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedContributionPlanEmployerMatchingContribution_ef49b39a-0bcc-4e77-9305-aa83f3e45f5d" xlink:href="mic-20211231.xsd#mic_DefinedContributionPlanEmployerMatchingContribution"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_703d3ad4-da78-4878-89a8-ccb28c44b1d7" xlink:to="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:to="loc_srt_RangeAxis_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e" xlink:to="loc_srt_RangeMember_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_df9f957a-d083-4f0a-be8c-815462884612" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ab1eed6f-f4fb-4b18-9dd8-b56675869e6e" xlink:to="loc_srt_RangeMember_df9f957a-d083-4f0a-be8c-815462884612" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b25a6910-76c8-4d16-9ac2-40385a9032d0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_df9f957a-d083-4f0a-be8c-815462884612" xlink:to="loc_srt_MinimumMember_b25a6910-76c8-4d16-9ac2-40385a9032d0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a2ab7999-dc59-4b60-8027-6aef0e2d1dcc" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_df9f957a-d083-4f0a-be8c-815462884612" xlink:to="loc_srt_MaximumMember_a2ab7999-dc59-4b60-8027-6aef0e2d1dcc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1d8b1886-76a2-49af-a736-d80c00cff895" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1d8b1886-76a2-49af-a736-d80c00cff895" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1d8b1886-76a2-49af-a736-d80c00cff895_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d8b1886-76a2-49af-a736-d80c00cff895" xlink:to="loc_us-gaap_SegmentDomain_1d8b1886-76a2-49af-a736-d80c00cff895_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_77e55e0b-794a-4583-91aa-4871f71e2c29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d8b1886-76a2-49af-a736-d80c00cff895" xlink:to="loc_us-gaap_SegmentDomain_77e55e0b-794a-4583-91aa-4871f71e2c29" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImttMember_c20da07b-80be-4130-a595-c6c07bfdd5ee" xlink:href="mic-20211231.xsd#mic_ImttMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_77e55e0b-794a-4583-91aa-4871f71e2c29" xlink:to="loc_mic_ImttMember_c20da07b-80be-4130-a595-c6c07bfdd5ee" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_fff8e430-3651-4e39-8fd6-b55001b6e580" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_77e55e0b-794a-4583-91aa-4871f71e2c29" xlink:to="loc_mic_HawaiiGasBusinessMember_fff8e430-3651-4e39-8fd6-b55001b6e580" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_143e9289-0e40-41f1-a369-a89bb6543611" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_143e9289-0e40-41f1-a369-a89bb6543611" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_143e9289-0e40-41f1-a369-a89bb6543611_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_143e9289-0e40-41f1-a369-a89bb6543611" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_143e9289-0e40-41f1-a369-a89bb6543611_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8f48ab89-c562-4d91-9d6d-7957fb485ece" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_143e9289-0e40-41f1-a369-a89bb6543611" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8f48ab89-c562-4d91-9d6d-7957fb485ece" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_b02048e7-c7b2-4fab-bfa6-70da08e30cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8f48ab89-c562-4d91-9d6d-7957fb485ece" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_b02048e7-c7b2-4fab-bfa6-70da08e30cbc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_7966db2f-7b4f-4849-b98c-711c48c27a02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8f48ab89-c562-4d91-9d6d-7957fb485ece" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_7966db2f-7b4f-4849-b98c-711c48c27a02" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPostretirementLifeInsuranceMember_d5538efb-6731-432f-8a8b-2f5446b72efb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPostretirementLifeInsuranceMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8f48ab89-c562-4d91-9d6d-7957fb485ece" xlink:to="loc_us-gaap_DefinedBenefitPostretirementLifeInsuranceMember_d5538efb-6731-432f-8a8b-2f5446b72efb" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:to="loc_us-gaap_RetirementPlanNameAxis_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8" xlink:to="loc_us-gaap_RetirementPlanNameDomain_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_ab10dfad-adb4-4a3c-80e5-5e66169558ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_b601c4ad-34c8-45dd-a87b-6fdaf20b2bb8" xlink:to="loc_us-gaap_RetirementPlanNameDomain_ab10dfad-adb4-4a3c-80e5-5e66169558ae" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_PostretirementPlansMember_f0392e7d-1b2f-4f89-a206-eb49e0889fcf" xlink:href="mic-20211231.xsd#mic_PostretirementPlansMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_ab10dfad-adb4-4a3c-80e5-5e66169558ae" xlink:to="loc_mic_PostretirementPlansMember_f0392e7d-1b2f-4f89-a206-eb49e0889fcf" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_68d90657-d98d-47ba-b58e-1caf070c7771" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedContributionPlanTable_c171deea-9b0d-4dda-8a5e-8e425f006d4a" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_68d90657-d98d-47ba-b58e-1caf070c7771" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_68d90657-d98d-47ba-b58e-1caf070c7771_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_68d90657-d98d-47ba-b58e-1caf070c7771" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_68d90657-d98d-47ba-b58e-1caf070c7771_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_5181b139-2d8a-49a8-a3f8-481f1bdb95be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_68d90657-d98d-47ba-b58e-1caf070c7771" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_5181b139-2d8a-49a8-a3f8-481f1bdb95be" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDiscontinuedOperationsMember_f561769d-4f0c-4cc1-a05b-2f32efb1001e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDiscontinuedOperationsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_5181b139-2d8a-49a8-a3f8-481f1bdb95be" xlink:to="loc_us-gaap_SegmentDiscontinuedOperationsMember_f561769d-4f0c-4cc1-a05b-2f32efb1001e" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsandChangesinPlanAssetsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsandChangesinPlanAssetsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsandChangesinPlanAssetsDetails" xlink:type="extended" id="ieee38224b19f4376a928b7ecd6ebb16c_EmployeeBenefitPlansScheduleofChangesinProjectedBenefitObligationsandChangesinPlanAssetsDetails">
<link:loc xlink:type="locator" xlink:label="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsLineItems_52f5a183-dfb6-44dd-abb1-863be6951e4a" xlink:href="mic-20211231.xsd#mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsLineItems_52f5a183-dfb6-44dd-abb1-863be6951e4a" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_8d38696c-5dd8-452a-97fa-a49c5d9c4db4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_8d38696c-5dd8-452a-97fa-a49c5d9c4db4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_c6e03b68-0bea-468c-9eff-fe4e00212836" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_c6e03b68-0bea-468c-9eff-fe4e00212836" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_f4788a28-6f48-4047-b65b-2c3ca8fc4bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_f4788a28-6f48-4047-b65b-2c3ca8fc4bf6" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_f80cd222-d338-47ad-9095-5e7a6d80e10b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_f80cd222-d338-47ad-9095-5e7a6d80e10b" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_70ba28eb-1ec3-4d69-9c0d-d398713afc27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_70ba28eb-1ec3-4d69-9c0d-d398713afc27" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_f5a92527-5252-4ec3-bdb8-06d306ed93c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_f5a92527-5252-4ec3-bdb8-06d306ed93c2" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDivestituresBenefitObligation_8a93e06d-4282-4a2b-991d-a1a0b727ce89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDivestituresBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_dc396faa-7150-4fb8-900b-d1456ccceb92" xlink:to="loc_us-gaap_DefinedBenefitPlanDivestituresBenefitObligation_8a93e06d-4282-4a2b-991d-a1a0b727ce89" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_93a7b9ed-056c-4c84-af46-6dcab1da1021" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsLineItems_52f5a183-dfb6-44dd-abb1-863be6951e4a" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_05431885-0646-4d89-94ca-d2a81f5ee2c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_05431885-0646-4d89-94ca-d2a81f5ee2c3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_07a58187-9bb8-4d4b-9948-6511f8124c75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_07a58187-9bb8-4d4b-9948-6511f8124c75" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_a77ed39c-80e2-454c-a3ee-bc61050eb3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_a77ed39c-80e2-454c-a3ee-bc61050eb3ec" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_cdd36ed5-fd28-4069-9ad8-f157e5c1e373" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_cdd36ed5-fd28-4069-9ad8-f157e5c1e373" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_867c1af6-6a9f-468a-8f59-8d67e97f975e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_867c1af6-6a9f-468a-8f59-8d67e97f975e" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDivestituresPlanAssets_fa6f3830-0c4e-46be-ac21-9e2933ab5aac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDivestituresPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_ba7f50d7-e5b7-4a28-af0b-fa5fa8ef86b4" xlink:to="loc_us-gaap_DefinedBenefitPlanDivestituresPlanAssets_fa6f3830-0c4e-46be-ac21-9e2933ab5aac" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_ed8dd477-0b53-46a9-a380-93ea14ac02a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsTable_76084854-1809-4f70-9cfa-0840673619c1" xlink:href="mic-20211231.xsd#mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsLineItems_52f5a183-dfb6-44dd-abb1-863be6951e4a" xlink:to="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsTable_76084854-1809-4f70-9cfa-0840673619c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1d4c52b7-a362-4e22-9a7d-225d056d45d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsTable_76084854-1809-4f70-9cfa-0840673619c1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1d4c52b7-a362-4e22-9a7d-225d056d45d4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1d4c52b7-a362-4e22-9a7d-225d056d45d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d4c52b7-a362-4e22-9a7d-225d056d45d4" xlink:to="loc_us-gaap_SegmentDomain_1d4c52b7-a362-4e22-9a7d-225d056d45d4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ed1093b4-3d9d-4654-83f6-4e117c66d955" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1d4c52b7-a362-4e22-9a7d-225d056d45d4" xlink:to="loc_us-gaap_SegmentDomain_ed1093b4-3d9d-4654-83f6-4e117c66d955" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_95c886fa-dc15-440a-88b7-afbd0b36094c" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ed1093b4-3d9d-4654-83f6-4e117c66d955" xlink:to="loc_mic_HawaiiGasBusinessMember_95c886fa-dc15-440a-88b7-afbd0b36094c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_InternationalMatexTankTerminalsMember_beacc1b1-41e4-46dd-a995-4a52618397d8" xlink:href="mic-20211231.xsd#mic_InternationalMatexTankTerminalsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ed1093b4-3d9d-4654-83f6-4e117c66d955" xlink:to="loc_mic_InternationalMatexTankTerminalsMember_beacc1b1-41e4-46dd-a995-4a52618397d8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_cca10527-d709-4ff3-8293-c13a88055f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirmentBenefitsChangesInBenefitObligationAndFairValueOfPlanAssetsTable_76084854-1809-4f70-9cfa-0840673619c1" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_cca10527-d709-4ff3-8293-c13a88055f8b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_cca10527-d709-4ff3-8293-c13a88055f8b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cca10527-d709-4ff3-8293-c13a88055f8b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_cca10527-d709-4ff3-8293-c13a88055f8b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cca10527-d709-4ff3-8293-c13a88055f8b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_e9ac2a5b-9d02-4500-affd-08d296602ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_e9ac2a5b-9d02-4500-affd-08d296602ef2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_ed0a9dfc-1453-4a57-a860-b4cd040641f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_ed0a9dfc-1453-4a57-a860-b4cd040641f2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationMember_60e7d0e4-fceb-4921-98cd-e9539d063679" xlink:href="mic-20211231.xsd#mic_AtlanticAviationMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:to="loc_mic_AtlanticAviationMember_60e7d0e4-fceb-4921-98cd-e9539d063679" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImttMember_53906f54-77f5-41f2-8305-9b748f81df14" xlink:href="mic-20211231.xsd#mic_ImttMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1d99baec-6a7b-4e76-880b-2cb31429149b" xlink:to="loc_mic_ImttMember_53906f54-77f5-41f2-8305-9b748f81df14" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansFundedStatusDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansFundedStatusDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansFundedStatusDetails" xlink:type="extended" id="i11b53c30b69c42418852c7a417087e73_EmployeeBenefitPlansFundedStatusDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_7a517572-c9a9-4b01-ba29-1d6e54ae3da9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract_45d83be6-62e1-441e-81ed-e94d885b2e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_7a517572-c9a9-4b01-ba29-1d6e54ae3da9" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract_45d83be6-62e1-441e-81ed-e94d885b2e0f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2ab40d9f-84d0-4f99-887a-b8b7f97a1be2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract_45d83be6-62e1-441e-81ed-e94d885b2e0f" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2ab40d9f-84d0-4f99-887a-b8b7f97a1be2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_b177264d-fd08-481f-b269-d46adb6edc3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract_45d83be6-62e1-441e-81ed-e94d885b2e0f" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_b177264d-fd08-481f-b269-d46adb6edc3b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_7bfc66db-5a72-4cfb-99cc-835ff2495746" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_7a517572-c9a9-4b01-ba29-1d6e54ae3da9" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_7bfc66db-5a72-4cfb-99cc-835ff2495746" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent_5e62117a-7369-48b0-8c75-1c310bb69fce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_7bfc66db-5a72-4cfb-99cc-835ff2495746" xlink:to="loc_us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent_5e62117a-7369-48b0-8c75-1c310bb69fce" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_384ae1d5-d4d5-415b-83d5-6cb32c785a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_7bfc66db-5a72-4cfb-99cc-835ff2495746" xlink:to="loc_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_384ae1d5-d4d5-415b-83d5-6cb32c785a1c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_8c946774-ad3a-4cbe-8a71-4e6233c6757b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1d8f5475-ad18-49a5-a1a7-cc67aba75df3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_7a517572-c9a9-4b01-ba29-1d6e54ae3da9" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1d8f5475-ad18-49a5-a1a7-cc67aba75df3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_47d31d43-cfed-41ab-a252-158d5512869d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1d8f5475-ad18-49a5-a1a7-cc67aba75df3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_47d31d43-cfed-41ab-a252-158d5512869d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_47d31d43-cfed-41ab-a252-158d5512869d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_47d31d43-cfed-41ab-a252-158d5512869d" xlink:to="loc_us-gaap_SegmentDomain_47d31d43-cfed-41ab-a252-158d5512869d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b8072a7b-ff85-440f-8ed0-36cb9cb774c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_47d31d43-cfed-41ab-a252-158d5512869d" xlink:to="loc_us-gaap_SegmentDomain_b8072a7b-ff85-440f-8ed0-36cb9cb774c3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_624db6c6-9520-40f6-bd51-30b75617391b" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b8072a7b-ff85-440f-8ed0-36cb9cb774c3" xlink:to="loc_mic_HawaiiGasBusinessMember_624db6c6-9520-40f6-bd51-30b75617391b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_InternationalMatexTankTerminalsMember_da0e5dff-789c-4806-8835-72c5d4e8d2ba" xlink:href="mic-20211231.xsd#mic_InternationalMatexTankTerminalsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b8072a7b-ff85-440f-8ed0-36cb9cb774c3" xlink:to="loc_mic_InternationalMatexTankTerminalsMember_da0e5dff-789c-4806-8835-72c5d4e8d2ba" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_b36668c7-c273-451c-87d1-14770f5c9b96" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1d8f5475-ad18-49a5-a1a7-cc67aba75df3" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_b36668c7-c273-451c-87d1-14770f5c9b96" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_b36668c7-c273-451c-87d1-14770f5c9b96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_b36668c7-c273-451c-87d1-14770f5c9b96" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_b36668c7-c273-451c-87d1-14770f5c9b96_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_82a8d500-2edc-45a1-9f5b-e648e197c157" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_b36668c7-c273-451c-87d1-14770f5c9b96" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_82a8d500-2edc-45a1-9f5b-e648e197c157" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_0cc9a387-9b8e-40d6-8804-69f3860ae912" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_82a8d500-2edc-45a1-9f5b-e648e197c157" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_0cc9a387-9b8e-40d6-8804-69f3860ae912" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_a9ed3acb-ce7c-4e7a-9fba-c8061a386f27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_82a8d500-2edc-45a1-9f5b-e648e197c157" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_a9ed3acb-ce7c-4e7a-9fba-c8061a386f27" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansAmountsnotyetreflectedinNetPeriodicBenefitCostandIncludedinAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansAmountsnotyetreflectedinNetPeriodicBenefitCostandIncludedinAccumulatedOtherComprehensiveLossDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansAmountsnotyetreflectedinNetPeriodicBenefitCostandIncludedinAccumulatedOtherComprehensiveLossDetails" xlink:type="extended" id="i74545a0ef8784abb8b3fb4afc00f5ee2_EmployeeBenefitPlansAmountsnotyetreflectedinNetPeriodicBenefitCostandIncludedinAccumulatedOtherComprehensiveLossDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a1aeede5-16a1-416b-aef0-914bbfe7e744" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a1aeede5-16a1-416b-aef0-914bbfe7e744" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_9c4d0f0f-85fe-4250-8d6a-dbb40562c7ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_9c4d0f0f-85fe-4250-8d6a-dbb40562c7ab" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_7c0353f5-66a8-422b-a238-e0edf864c297" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_7c0353f5-66a8-422b-a238-e0edf864c297" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_914de817-1604-4752-a286-b96f13505269" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_914de817-1604-4752-a286-b96f13505269" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcessOfDeficitOfCumulativeEmployerContributions_77596324-20ad-4a18-955a-64270f0ef34a" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcessOfDeficitOfCumulativeEmployerContributions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_mic_DefinedBenefitPlanNetPeriodicBenefitCostCreditExcessOfDeficitOfCumulativeEmployerContributions_77596324-20ad-4a18-955a-64270f0ef34a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_DefinedBenefitPlanDispositionOfNetPeriodicBenefitCostInDeficitOfCumulativeEmployerContributionsDueToSaleOfBusiness_e5d171d8-61e2-4d61-b282-e3a71d9d4798" xlink:href="mic-20211231.xsd#mic_DefinedBenefitPlanDispositionOfNetPeriodicBenefitCostInDeficitOfCumulativeEmployerContributionsDueToSaleOfBusiness"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_mic_DefinedBenefitPlanDispositionOfNetPeriodicBenefitCostInDeficitOfCumulativeEmployerContributionsDueToSaleOfBusiness_e5d171d8-61e2-4d61-b282-e3a71d9d4798" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_fd32de90-0472-4d09-ad76-240b557ac8b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_fd32de90-0472-4d09-ad76-240b557ac8b5" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_e079820b-5d4f-4206-8705-fff4b9c42d78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTaxAbstract_ad3c6fc8-b43b-4484-a620-bf4ea93e503e" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_e079820b-5d4f-4206-8705-fff4b9c42d78" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_efd645fb-1b05-4ec6-9eb3-d5ceafb9ef49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a1aeede5-16a1-416b-aef0-914bbfe7e744" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_efd645fb-1b05-4ec6-9eb3-d5ceafb9ef49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_355912ec-a6dc-4f18-be43-8d0075c7e7ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_efd645fb-1b05-4ec6-9eb3-d5ceafb9ef49" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_355912ec-a6dc-4f18-be43-8d0075c7e7ea" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_355912ec-a6dc-4f18-be43-8d0075c7e7ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_355912ec-a6dc-4f18-be43-8d0075c7e7ea" xlink:to="loc_us-gaap_SegmentDomain_355912ec-a6dc-4f18-be43-8d0075c7e7ea_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_16323f1a-7076-4101-b22b-062e00fff434" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_355912ec-a6dc-4f18-be43-8d0075c7e7ea" xlink:to="loc_us-gaap_SegmentDomain_16323f1a-7076-4101-b22b-062e00fff434" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_4fdf8cbf-cc57-4e13-90e3-8d884c16aee7" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_16323f1a-7076-4101-b22b-062e00fff434" xlink:to="loc_mic_HawaiiGasBusinessMember_4fdf8cbf-cc57-4e13-90e3-8d884c16aee7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_InternationalMatexTankTerminalsMember_c751bb1f-7d74-4e1c-bec2-d152d3889c75" xlink:href="mic-20211231.xsd#mic_InternationalMatexTankTerminalsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_16323f1a-7076-4101-b22b-062e00fff434" xlink:to="loc_mic_InternationalMatexTankTerminalsMember_c751bb1f-7d74-4e1c-bec2-d152d3889c75" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_0ee27420-d3a9-4b60-ab02-7da52b84388e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_efd645fb-1b05-4ec6-9eb3-d5ceafb9ef49" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_0ee27420-d3a9-4b60-ab02-7da52b84388e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_0ee27420-d3a9-4b60-ab02-7da52b84388e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0ee27420-d3a9-4b60-ab02-7da52b84388e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_0ee27420-d3a9-4b60-ab02-7da52b84388e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0ee27420-d3a9-4b60-ab02-7da52b84388e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_8bb178ed-e281-4200-bd67-94e1d581679e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_8bb178ed-e281-4200-bd67-94e1d581679e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_868cc035-636a-435f-b2c5-df4f0918f54b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_868cc035-636a-435f-b2c5-df4f0918f54b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_AtlanticAviationMember_a23d3fe7-789d-436d-aa1f-23bb3946cb6f" xlink:href="mic-20211231.xsd#mic_AtlanticAviationMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:to="loc_mic_AtlanticAviationMember_a23d3fe7-789d-436d-aa1f-23bb3946cb6f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ImttMember_96daac9a-72c9-448d-a1f7-76d247f48bb4" xlink:href="mic-20211231.xsd#mic_ImttMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8d113dfa-7796-4d1c-99ee-4c3ddb40d0e0" xlink:to="loc_mic_ImttMember_96daac9a-72c9-448d-a1f7-76d247f48bb4" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansAmortizedfromAccumulatedOtherComprehensiveIncomeLossovertheNextYearDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansAmortizedfromAccumulatedOtherComprehensiveIncomeLossovertheNextYearDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansAmortizedfromAccumulatedOtherComprehensiveIncomeLossovertheNextYearDetails" xlink:type="extended" id="i6106b17f46b4460192268c746d8a605d_EmployeeBenefitPlansAmortizedfromAccumulatedOtherComprehensiveIncomeLossovertheNextYearDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6eb589d5-97f3-4425-b65b-6c971f23e6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_17dc68a8-25fa-4ae7-b0b2-0e67f3b96b0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6eb589d5-97f3-4425-b65b-6c971f23e6cd" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_17dc68a8-25fa-4ae7-b0b2-0e67f3b96b0b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_cc64cbf1-3cf5-4977-a3a2-16f1fe378dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6eb589d5-97f3-4425-b65b-6c971f23e6cd" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_cc64cbf1-3cf5-4977-a3a2-16f1fe378dd6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_401c3d26-4d51-4bac-878a-2313a67d0198" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_6eb589d5-97f3-4425-b65b-6c971f23e6cd" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_401c3d26-4d51-4bac-878a-2313a67d0198" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_affd8c95-c4ae-4f17-9f31-bf92183b7480" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_401c3d26-4d51-4bac-878a-2313a67d0198" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_affd8c95-c4ae-4f17-9f31-bf92183b7480" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_affd8c95-c4ae-4f17-9f31-bf92183b7480_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_affd8c95-c4ae-4f17-9f31-bf92183b7480" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_affd8c95-c4ae-4f17-9f31-bf92183b7480_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_da0b654f-cf67-4a84-a9bd-ca4c09f4602b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_affd8c95-c4ae-4f17-9f31-bf92183b7480" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_da0b654f-cf67-4a84-a9bd-ca4c09f4602b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_214fb184-fa36-4c8d-af47-3ce6c4bbd71a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_da0b654f-cf67-4a84-a9bd-ca4c09f4602b" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_214fb184-fa36-4c8d-af47-3ce6c4bbd71a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_075fb932-9f4e-4dad-808d-7d76077f948c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_da0b654f-cf67-4a84-a9bd-ca4c09f4602b" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_075fb932-9f4e-4dad-808d-7d76077f948c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4d21ffac-a044-49f2-b2e0-c9cf9922153b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_401c3d26-4d51-4bac-878a-2313a67d0198" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4d21ffac-a044-49f2-b2e0-c9cf9922153b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4d21ffac-a044-49f2-b2e0-c9cf9922153b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4d21ffac-a044-49f2-b2e0-c9cf9922153b" xlink:to="loc_us-gaap_SegmentDomain_4d21ffac-a044-49f2-b2e0-c9cf9922153b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cf1300a4-8954-4b8d-bdc8-a4c6b873f1ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4d21ffac-a044-49f2-b2e0-c9cf9922153b" xlink:to="loc_us-gaap_SegmentDomain_cf1300a4-8954-4b8d-bdc8-a4c6b873f1ea" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_0c45d76c-c424-4c3b-b310-861a2ba8dbe9" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cf1300a4-8954-4b8d-bdc8-a4c6b873f1ea" xlink:to="loc_mic_HawaiiGasBusinessMember_0c45d76c-c424-4c3b-b310-861a2ba8dbe9" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostandOtherChangesinOtherComprehensiveLossIncomeforPlansDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostandOtherChangesinOtherComprehensiveLossIncomeforPlansDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostandOtherChangesinOtherComprehensiveLossIncomeforPlansDetails" xlink:type="extended" id="i6eae98cc4c20464785c947f627de5917_EmployeeBenefitPlansComponentsofNetPeriodicBenefitCostandOtherChangesinOtherComprehensiveLossIncomeforPlansDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_8be6cd91-7c22-4d00-b240-e58ae4e250a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_8be6cd91-7c22-4d00-b240-e58ae4e250a5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_1285a5e9-9cde-492f-bb43-05c13df07227" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_1285a5e9-9cde-492f-bb43-05c13df07227" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_50f1846b-3a37-4a4f-9fb6-dc31b23f3b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_50f1846b-3a37-4a4f-9fb6-dc31b23f3b1e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_be4d1309-7092-4038-8b58-1075904648cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_be4d1309-7092-4038-8b58-1075904648cc" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_8cf7a933-5e61-410b-8e6f-034e341085cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_8cf7a933-5e61-410b-8e6f-034e341085cd" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_20f947a6-0bbb-4d4a-b170-b120c9b6b9d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_e7ce07d3-e7ee-45c5-8756-2f10425e6bfc" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_20f947a6-0bbb-4d4a-b170-b120c9b6b9d7" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_d23354ab-b66e-4db6-8987-91048947f83a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_d23354ab-b66e-4db6-8987-91048947f83a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_d9a689a2-9b16-4168-b5e2-043f0f7a4c46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_d9a689a2-9b16-4168-b5e2-043f0f7a4c46" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_a063bd6c-8c0c-41f4-a31f-378efe9e578b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_a063bd6c-8c0c-41f4-a31f-378efe9e578b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_0c9293b0-a90b-4337-bd28-3fe18b329419" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeAbstract_9418a383-fbe2-439c-b1a1-a6662b11b78e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_0c9293b0-a90b-4337-bd28-3fe18b329419" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_bf8b30b7-69e3-4d16-855c-5780a73d5983" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_bf8b30b7-69e3-4d16-855c-5780a73d5983" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_13ddf93b-fdde-4635-8cab-a77f637a803c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_bf8b30b7-69e3-4d16-855c-5780a73d5983" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_13ddf93b-fdde-4635-8cab-a77f637a803c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_2d442465-4202-4ac1-a3d8-28021abeaa9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_bf8b30b7-69e3-4d16-855c-5780a73d5983" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_2d442465-4202-4ac1-a3d8-28021abeaa9f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_d0496029-4c7b-43ce-9ab0-f96ffce260ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_d0496029-4c7b-43ce-9ab0-f96ffce260ab" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_ada087f9-495b-4868-ab0a-01a1bb882cea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_d0496029-4c7b-43ce-9ab0-f96ffce260ab" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_ada087f9-495b-4868-ab0a-01a1bb882cea" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_567d36b8-1078-4161-822f-7810d85af71f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_d0496029-4c7b-43ce-9ab0-f96ffce260ab" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_567d36b8-1078-4161-822f-7810d85af71f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_19cd15c5-b3ec-403a-bff4-1dabdbcf76cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract_65239043-add3-4030-8631-ca05cf797bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract_65239043-add3-4030-8631-ca05cf797bb7" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_35ace35d-4fca-4e71-8266-122b2a47cc99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract_65239043-add3-4030-8631-ca05cf797bb7" xlink:to="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_35ace35d-4fca-4e71-8266-122b2a47cc99" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_ffa07f2a-f7d2-4549-b7b3-752f99265a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract_65239043-add3-4030-8631-ca05cf797bb7" xlink:to="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_ffa07f2a-f7d2-4549-b7b3-752f99265a9f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e587c812-974c-4204-b45e-1b46544c7c84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_9f6854f1-f750-4ca5-b14d-5740e07e26b5" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e587c812-974c-4204-b45e-1b46544c7c84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_20ea2fa1-aa71-4eb9-a79e-10759ceebb95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e587c812-974c-4204-b45e-1b46544c7c84" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_20ea2fa1-aa71-4eb9-a79e-10759ceebb95" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_20ea2fa1-aa71-4eb9-a79e-10759ceebb95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_20ea2fa1-aa71-4eb9-a79e-10759ceebb95" xlink:to="loc_us-gaap_SegmentDomain_20ea2fa1-aa71-4eb9-a79e-10759ceebb95_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5b941890-e530-4473-9437-4fde624f8483" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_20ea2fa1-aa71-4eb9-a79e-10759ceebb95" xlink:to="loc_us-gaap_SegmentDomain_5b941890-e530-4473-9437-4fde624f8483" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_b79c6433-6671-4be2-b257-5d4ad177638d" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5b941890-e530-4473-9437-4fde624f8483" xlink:to="loc_mic_HawaiiGasBusinessMember_b79c6433-6671-4be2-b257-5d4ad177638d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_InternationalMatexTankTerminalsMember_c20ba220-f825-4c54-887a-d3df9c4e2074" xlink:href="mic-20211231.xsd#mic_InternationalMatexTankTerminalsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5b941890-e530-4473-9437-4fde624f8483" xlink:to="loc_mic_InternationalMatexTankTerminalsMember_c20ba220-f825-4c54-887a-d3df9c4e2074" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_c830cdec-8489-43bd-9950-020fd5c9ff40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e587c812-974c-4204-b45e-1b46544c7c84" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_c830cdec-8489-43bd-9950-020fd5c9ff40" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_c830cdec-8489-43bd-9950-020fd5c9ff40_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_c830cdec-8489-43bd-9950-020fd5c9ff40" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_c830cdec-8489-43bd-9950-020fd5c9ff40_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_454f4014-8d2d-4105-b512-77a23efb1ad7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_c830cdec-8489-43bd-9950-020fd5c9ff40" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_454f4014-8d2d-4105-b512-77a23efb1ad7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_ce9c8ac5-855f-4833-936f-8e3321b095a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_454f4014-8d2d-4105-b512-77a23efb1ad7" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_ce9c8ac5-855f-4833-936f-8e3321b095a0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_717eecfb-5738-474b-84c3-609fb6a27066" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_454f4014-8d2d-4105-b512-77a23efb1ad7" xlink:to="loc_us-gaap_OtherPensionPlansDefinedBenefitMember_717eecfb-5738-474b-84c3-609fb6a27066" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_e587c812-974c-4204-b45e-1b46544c7c84" xlink:to="loc_srt_RangeAxis_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6" xlink:to="loc_srt_RangeMember_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88d6d97a-9f96-4afc-a3fc-5a3c5eafaf96" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_71ab2cc8-773c-4f7a-a6da-44ac8c8f2ec6" xlink:to="loc_srt_RangeMember_88d6d97a-9f96-4afc-a3fc-5a3c5eafaf96" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_dc7efe4a-e360-4a57-b7b5-758904250f58" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88d6d97a-9f96-4afc-a3fc-5a3c5eafaf96" xlink:to="loc_srt_MinimumMember_dc7efe4a-e360-4a57-b7b5-758904250f58" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_436b180f-1b05-474e-a913-80a1c7d78dff" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_88d6d97a-9f96-4afc-a3fc-5a3c5eafaf96" xlink:to="loc_srt_MaximumMember_436b180f-1b05-474e-a913-80a1c7d78dff" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansAssetAllocationDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansAssetAllocationDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansAssetAllocationDetails" xlink:type="extended" id="i5c09841a59404344b94e25fc7eeaa89a_EmployeeBenefitPlansAssetAllocationDetails">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_fd3c2c1c-bf5c-4548-b844-cd542206b95e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_7bf79715-e505-4959-9c35-5f9da5fa8ab2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_fd3c2c1c-bf5c-4548-b844-cd542206b95e" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_7bf79715-e505-4959-9c35-5f9da5fa8ab2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bfc26b51-4313-486f-96ff-cace5102541e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_fd3c2c1c-bf5c-4548-b844-cd542206b95e" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bfc26b51-4313-486f-96ff-cace5102541e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7329e4b8-4a79-4160-bdad-afbb93d62b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bfc26b51-4313-486f-96ff-cace5102541e" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7329e4b8-4a79-4160-bdad-afbb93d62b8c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_7329e4b8-4a79-4160-bdad-afbb93d62b8c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7329e4b8-4a79-4160-bdad-afbb93d62b8c" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_7329e4b8-4a79-4160-bdad-afbb93d62b8c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_7329e4b8-4a79-4160-bdad-afbb93d62b8c" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_a28de311-e824-4d45-ba14-f73c32f9dfc6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_a28de311-e824-4d45-ba14-f73c32f9dfc6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_3e98896c-6282-455f-b7f3-37c69a879df7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_3e98896c-6282-455f-b7f3-37c69a879df7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_GlobalRealEstateFundMember_ceb65a20-4450-4bda-a62d-73a714455b93" xlink:href="mic-20211231.xsd#mic_GlobalRealEstateFundMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:to="loc_mic_GlobalRealEstateFundMember_ceb65a20-4450-4bda-a62d-73a714455b93" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashMember_e2065009-9f33-4103-80aa-92fc808a962e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanCashMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_a717af03-cf88-41bd-8c47-64e47753fd95" xlink:to="loc_us-gaap_DefinedBenefitPlanCashMember_e2065009-9f33-4103-80aa-92fc808a962e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_da17f77f-5c66-4b07-b19b-915d8b3e8af9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bfc26b51-4313-486f-96ff-cace5102541e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_da17f77f-5c66-4b07-b19b-915d8b3e8af9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_da17f77f-5c66-4b07-b19b-915d8b3e8af9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_da17f77f-5c66-4b07-b19b-915d8b3e8af9" xlink:to="loc_us-gaap_SegmentDomain_da17f77f-5c66-4b07-b19b-915d8b3e8af9_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_403ec3a1-9bcc-4a9a-bd54-673a76e21a9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_da17f77f-5c66-4b07-b19b-915d8b3e8af9" xlink:to="loc_us-gaap_SegmentDomain_403ec3a1-9bcc-4a9a-bd54-673a76e21a9c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_HawaiiGasBusinessMember_d05bf5c2-6040-42d5-a792-5e86deec8ccd" xlink:href="mic-20211231.xsd#mic_HawaiiGasBusinessMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_403ec3a1-9bcc-4a9a-bd54-673a76e21a9c" xlink:to="loc_mic_HawaiiGasBusinessMember_d05bf5c2-6040-42d5-a792-5e86deec8ccd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_6e98d45c-6d53-4f8b-b94c-4a03549736b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_bfc26b51-4313-486f-96ff-cace5102541e" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_6e98d45c-6d53-4f8b-b94c-4a03549736b3" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_6e98d45c-6d53-4f8b-b94c-4a03549736b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_6e98d45c-6d53-4f8b-b94c-4a03549736b3" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_6e98d45c-6d53-4f8b-b94c-4a03549736b3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_7a75f4f5-c1f9-41f2-a544-bcccfd54007f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_6e98d45c-6d53-4f8b-b94c-4a03549736b3" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_7a75f4f5-c1f9-41f2-a544-bcccfd54007f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_594da0c8-1d54-463a-8000-a7a7a9582715" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_7a75f4f5-c1f9-41f2-a544-bcccfd54007f" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_594da0c8-1d54-463a-8000-a7a7a9582715" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.macquarie.com/role/EmployeeBenefitPlansAssetAllocationsDetails" xlink:type="simple" xlink:href="mic-20211231.xsd#EmployeeBenefitPlansAssetAllocationsDetails"/>
<link:definitionLink xlink:role="http://www.macquarie.com/role/EmployeeBenefitPlansAssetAllocationsDetails" xlink:type="extended" id="i51d46734b73849be91c6f6b4ce1f0f2e_EmployeeBenefitPlansAssetAllocationsDetails">
<link:loc xlink:type="locator" xlink:label="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsLineItems_a41ddaff-4999-4c8e-92d2-00a79de3695a" xlink:href="mic-20211231.xsd#mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_5e6e30cc-56e4-4d31-9965-72d80f52aa51" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsLineItems_a41ddaff-4999-4c8e-92d2-00a79de3695a" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_5e6e30cc-56e4-4d31-9965-72d80f52aa51" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsTable_5dd4afe8-0804-400f-9237-24cd60b4a537" xlink:href="mic-20211231.xsd#mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsLineItems_a41ddaff-4999-4c8e-92d2-00a79de3695a" xlink:to="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsTable_5dd4afe8-0804-400f-9237-24cd60b4a537" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a24da843-54ee-473d-9eff-91e924845f98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsTable_5dd4afe8-0804-400f-9237-24cd60b4a537" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a24da843-54ee-473d-9eff-91e924845f98" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_a24da843-54ee-473d-9eff-91e924845f98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a24da843-54ee-473d-9eff-91e924845f98" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_a24da843-54ee-473d-9eff-91e924845f98_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a24da843-54ee-473d-9eff-91e924845f98" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_d057c6a2-67f5-4d79-b4f2-5cf3db9c374e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_d057c6a2-67f5-4d79-b4f2-5cf3db9c374e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_82b92baf-31b9-4f43-8f27-6c8c8963fbac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_82b92baf-31b9-4f43-8f27-6c8c8963fbac" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_dd5164dd-1974-4cff-acb1-cbaeea4cede2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_dd5164dd-1974-4cff-acb1-cbaeea4cede2" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_mic_GlobalRealEstateFundMember_f8f9614d-7d0b-4f34-a08b-51407d6b4558" xlink:href="mic-20211231.xsd#mic_GlobalRealEstateFundMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_c0625cb5-223f-494d-99ab-3b3d4ab2f647" xlink:to="loc_mic_GlobalRealEstateFundMember_f8f9614d-7d0b-4f34-a08b-51407d6b4558" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mic_ScheduleOfPensionAndOtherPostretirementBenefitsExpectedBenefitPaymentsTable_5dd4afe8-0804-400f-9237-24cd60b4a537" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d1b8d01-db22-4e6e-b40b-d3c28e4d02ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_89f3d9b3-ff2d-4aa1-b5f4-b71ee23452ab" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d1b8d01-db22-4e6e-b40b-d3c28e4d02ed" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_24244fa9-3a74-4a70-9548-999df2092c84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d1b8d01-db22-4e6e-b40b-d3c28e4d02ed" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_24244fa9-3a74-4a70-9548-999df2092c84" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_44acd246-d902-4261-a8be-2715a52cf19e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d1b8d01-db22-4e6e-b40b-d3c28e4d02ed" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_44acd246-d902-4261-a8be-2715a52cf19e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_0820e71a-29f4-4c20-8784-3601eebb1950" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d1b8d01-db22-4e6e-b40b-d3c28e4d02ed" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_0820e71a-29f4-4c20-8784-3601eebb1950" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd#eedm"/>
<link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member" xlink:type="arc" order="0"/>
</link:definitionLink>
</link:linkbase>


17 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 9/22/21  AMF Hawaii Investments, LLC       8-K12B:1,2, 9/22/21    8:1.2M                                   Toppan Merrill/FA
 6/15/21  Macquarie Infrastructure Corp.    8-K:1,7,9   6/14/21   13:1.1M                                   Toppan Merrill/FA
 6/07/21  Macquarie Infrastructure Corp.    8-K:1,7,9   6/07/21   12:1.1M                                   Toppan Merrill/FA
 3/30/21  AMF Hawaii Investments, LLC       S-4/A                  9:4.2M                                   Toppan Merrill/FA
 2/17/21  AMF Hawaii Investments, LLC       S-4                    4:1.7M                                   Toppan Merrill/FA
11/09/20  Macquarie Infrastructure Corp.    8-K:1,2,7,911/08/20   14:44M                                    Workiva Inc Wde… FA01/FA
 2/25/20  Macquarie Infrastructure Corp.    10-K       12/31/19  125:21M                                    Workiva Inc Wde… FA01/FA
 4/02/19  Macquarie Infrastructure Corp.    DEF 14A     5/15/19    1:2.8M                                   Broadridge Fin’l So… Inc
10/31/18  Macquarie Infrastructure Corp.    8-K:1,2,7,910/30/18    4:1.6M                                   Toppan Merrill/FA
 2/21/18  Macquarie Infrastructure Corp.    10-K       12/31/17  112:18M                                    Toppan Merrill/FA
 5/03/17  Macquarie Infrastructure Corp.    10-Q        3/31/17   73:5.9M                                   Toppan Merrill/FA
10/14/16  Macquarie Infrastructure Corp.    8-K:1,9    10/13/16    2:433K                                   Toppan Merrill/FA
 5/02/16  Macquarie Infrastructure Corp.    10-Q        3/31/16   74:7.5M                                   Toppan Merrill/FA
 4/01/16  Macquarie Infrastructure Corp.    DEF 14A     5/18/16    1:2.9M                                   Toppan Merrill/FA
 5/21/15  Macquarie Infrastructure Corp.    8-K12G3:1,3 5/21/15    8:817K                                   Toppan Merrill/FA
 7/18/14  Macquarie Infrastructure Corp.    8-K:1,2,3,9 7/15/14    3:797K                                   Toppan Merrill/FA
 4/04/14  Macquarie Infrastructure Corp.    DEF 14A     5/21/14    1:998K                                   Toppan Merrill/FA
Top
Filing Submission 0001628280-22-003230   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Fri., May 17, 1:39:43.2pm ET