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

Arcadium Lithium plc – ‘10-K’ for 12/31/23 – ‘EX-101.DEF’

On:  Thursday, 2/29/24, at 4:53pm ET   ·   For:  12/31/23   ·   Accession #:  1977303-24-8   ·   File #:  1-41907

Previous ‘10-K’:  None   ·   Next:  ‘10-K/A’ on 4/1/24 for 12/31/23   ·   Latest:  ‘10-K/A’ on 4/29/24 for 12/31/23   ·   21 References:   

Find Words in Filings emoji
 
  in    Show  and   Hints

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

 2/29/24  Arcadium Lithium plc              10-K       12/31/23  135:46M

Annual Report   —   Form 10-K   —   SEA’34

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   2.91M 
 2: EX-4.1      Instrument Defining the Rights of Security Holders  HTML     50K 
 3: EX-10.19    Material Contract                                   HTML     77K 
 4: EX-10.20    Material Contract                                   HTML     77K 
 5: EX-10.21    Material Contract                                   HTML     76K 
 6: EX-19.1     Report Furnished to Security Holders                HTML     79K 
 7: EX-21.1     Subsidiaries List                                   HTML     35K 
 8: EX-23.1     Consent of Expert or Counsel                        HTML     32K 
17: EX-23.10    Consent of Expert or Counsel                        HTML     35K 
18: EX-23.11    Consent of Expert or Counsel                        HTML     34K 
19: EX-23.12    Consent of Expert or Counsel                        HTML     35K 
20: EX-23.13    Consent of Expert or Counsel                        HTML     35K 
21: EX-23.14    Consent of Expert or Counsel                        HTML     35K 
22: EX-23.15    Consent of Expert or Counsel                        HTML     34K 
23: EX-23.16    Consent of Expert or Counsel                        HTML     35K 
24: EX-23.17    Consent of Expert or Counsel                        HTML     35K 
25: EX-23.18    Consent of Expert or Counsel                        HTML     35K 
26: EX-23.19    Consent of Expert or Counsel                        HTML     35K 
 9: EX-23.2     Consent of Expert or Counsel                        HTML     34K 
10: EX-23.3     Consent of Expert or Counsel                        HTML     34K 
11: EX-23.4     Consent of Expert or Counsel                        HTML     34K 
12: EX-23.5     Consent of Expert or Counsel                        HTML     35K 
13: EX-23.6     Consent of Expert or Counsel                        HTML     35K 
14: EX-23.7     Consent of Expert or Counsel                        HTML     35K 
15: EX-23.8     Consent of Expert or Counsel                        HTML     32K 
16: EX-23.9     Consent of Expert or Counsel                        HTML     34K 
31: EX-97.1     Clawback Policy re: Recovery of Erroneously         HTML     52K 
                Awarded Compensation                                             
27: EX-31.1     Certification -- §302 - SOA'02                      HTML     38K 
28: EX-31.2     Certification -- §302 - SOA'02                      HTML     38K 
29: EX-32.1     Certification -- §906 - SOA'02                      HTML     34K 
30: EX-32.2     Certification -- §906 - SOA'02                      HTML     34K 
37: R1          Cover                                               HTML    102K 
38: R2          Audit Information                                   HTML     39K 
39: R3          Consolidated Statements of Operations               HTML    116K 
40: R4          Consolidated Statements of Comprehensive Income     HTML     81K 
41: R5          Consolidated Statements of Comprehensive Income     HTML     38K 
                (Parenthetical)                                                  
42: R6          Consolidated Balance Sheets                         HTML    171K 
43: R7          Consolidated Balance Sheets (Parenthetical)         HTML     52K 
44: R8          Consolidated Statements of Cash Flows               HTML    170K 
45: R9          Consolidated Statements of Cash Flows               HTML     39K 
                (Parenthetical)                                                  
46: R10         Consolidated Statements of Equity                   HTML    103K 
47: R11         Consolidated Statements of Equity (Parenthetical)   HTML     35K 
48: R12         Description of the Business                         HTML     38K 
49: R13         Principal Accounting Policies and Related           HTML     76K 
                Financial Information                                            
50: R14         Recently Issued and Adopted Accounting              HTML     47K 
                Pronouncements and Regulatory Items                              
51: R15         Revenue Recognition                                 HTML     79K 
52: R16         Inventories, Net                                    HTML     42K 
53: R17         Investments                                         HTML    161K 
54: R18         Property, Plant and Equipment, Net                  HTML     49K 
55: R19         Restructuring and Other Charges                     HTML     50K 
56: R20         Environmental Obligations                           HTML     57K 
57: R21         Income Taxes                                        HTML    128K 
58: R22         Debt                                                HTML     73K 
59: R23         Stock-based Compensation                            HTML    104K 
60: R24         Equity                                              HTML     99K 
61: R25         Earnings Per Share                                  HTML     61K 
62: R26         Financial Instruments, Risk Management and Fair     HTML    109K 
                Value Measurements                                               
63: R27         Commitments and Contingencies                       HTML     64K 
64: R28         Supplemental Information                            HTML     81K 
65: R29         Subsequent Event                                    HTML     45K 
66: R30         Pay vs Performance Disclosure                       HTML     46K 
67: R31         Insider Trading Arrangements                        HTML     40K 
68: R32         Principal Accounting Policies and Related           HTML    149K 
                Financial Information (Policies)                                 
69: R33         Principal Accounting Policies and Related           HTML     52K 
                Financial Information (Tables)                                   
70: R34         Revenue Recognition (Tables)                        HTML     69K 
71: R35         Inventories, Net (Tables)                           HTML     43K 
72: R36         Investments (Tables)                                HTML    152K 
73: R37         Property, Plant and Equipment, Net (Tables)         HTML     52K 
74: R38         Restructuring and Other Charges (Tables)            HTML     49K 
75: R39         Environmental Obligations (Tables)                  HTML     51K 
76: R40         Income Taxes (Tables)                               HTML    130K 
77: R41         Debt (Tables)                                       HTML     60K 
78: R42         Stock-based Compensation (Tables)                   HTML    101K 
79: R43         Equity (Tables)                                     HTML    102K 
80: R44         Earnings Per Share (Tables)                         HTML     58K 
81: R45         Financial Instruments, Risk Management and Fair     HTML    104K 
                Value Measurements (Tables)                                      
82: R46         Commitments and Contingencies (Tables)              HTML     59K 
83: R47         Supplemental Information (Tables)                   HTML     83K 
84: R48         Subsequent Event (Tables)                           HTML     39K 
85: R49         Principal Accounting Policies and Related           HTML     50K 
                Financial Information - Property, Plant and                      
                Equipment (Details)                                              
86: R50         Principal Accounting Policies and Related           HTML     75K 
                Financial Information - Narrative (Details)                      
87: R51         Revenue Recognition - Revenue By Major              HTML     58K 
                Geographical Region (Details)                                    
88: R52         Revenue Recognition - Narrative (Details)           HTML     58K 
89: R53         Revenue Recognition - Revenue By Major Product      HTML     50K 
                Category (Details)                                               
90: R54         Revenue Recognition - Assets and Liabilities        HTML     52K 
                (Details)                                                        
91: R55         Revenue Recognition - Performance Obligations       HTML     39K 
                (Details)                                                        
92: R56         Inventories, Net (Details)                          HTML     42K 
93: R57         Investments - Narrative (Details)                   HTML     67K 
94: R58         Investments - Summarized Financial Information      HTML    215K 
                (Details)                                                        
95: R59         Investments - Statement of Operations (Details)     HTML     66K 
96: R60         Investments - Cash Flow Information (Details)       HTML     88K 
97: R61         Property, Plant and Equipment, Net (Details)        HTML     56K 
98: R62         Restructuring and Other Charges - Restructuring     HTML     55K 
                Charges in Consolidated Income (Details)                         
99: R63         Environmental Obligations - Narrative (Details)     HTML     39K 
100: R64         Environmental Obligations - Environmental Reserve   HTML     42K  
                Rollforward (Details)                                            
101: R65         Environmental Obligations - Reserves (Details)      HTML     48K  
102: R66         Income Taxes - Domestic and Foreign Income Tax      HTML     43K  
                Components (Details)                                             
103: R67         Income Taxes - Provision (Benefit) (Details)        HTML     62K  
104: R68         Income Taxes - Deferred Tax Assets and Liabilities  HTML     64K  
                (Details)                                                        
105: R69         Income Taxes - Effective Income Tax Rate            HTML     63K  
                Reconciliation (Details)                                         
106: R70         Income Taxes - Narrative (Details)                  HTML     82K  
107: R71         Debt - Long-term Debt (Details)                     HTML     83K  
108: R72         Debt - Narrative (Details)                          HTML    124K  
109: R73         Stock-based Compensation - Narrative (Details)      HTML     92K  
110: R74         Stock-based Compensation - Stock Compensation       HTML     60K  
                (Details)                                                        
111: R75         Stock-based Compensation - Black Scholes            HTML     52K  
                Assumptions (Details)                                            
112: R76         Stock-based Compensation - Stock Option Activity    HTML     76K  
                (Details)                                                        
113: R77         Stock-based Compensation - Stock Activity           HTML     72K  
                (Details)                                                        
114: R78         Stock-based Compensation - Fair Value Assumptions   HTML     66K  
                (Details)                                                        
115: R79         Equity - Summary of Common Stock Activity           HTML     64K  
                (Details)                                                        
116: R80         Equity - Additional Information (Details)           HTML     50K  
117: R81         Equity - Schedule of Accumulated Other              HTML     53K  
                Comprehensive Loss) (Details)                                    
118: R82         Equity - Reclassification Out of Accumulated Other  HTML     66K  
                Comprehensive Income (Details)                                   
119: R83         Earnings Per Share - EPS Computation (Details)      HTML     90K  
120: R84         Earnings Per Share - Narrative (Details)            HTML     41K  
121: R85         Financial Instruments, Risk Management and Fair     HTML     50K  
                Value Measurements - Narrative (Details)                         
122: R86         Financial Instruments, Risk Management and Fair     HTML     52K  
                Value Measurements - Derivatives in Cash Flow                    
                Hedging Relationships (Details)                                  
123: R87         Financial Instruments, Risk Management and Fair     HTML     41K  
                Value Measurements - Derivatives Not Designated As               
                Cash Flow Hedging Instruments (Details)                          
124: R88         Financial Instruments, Risk Management and Fair     HTML     61K  
                Value Measurements - Recurring Fair Value                        
                Measurements (Details)                                           
125: R89         Commitments and Contingencies - Narrative           HTML     52K  
                (Details)                                                        
126: R90         Commitments and Contingencies - Lease Cost and      HTML     47K  
                Terms (Details)                                                  
127: R91         Commitments and Contingencies - Maturity of         HTML     52K  
                Operating Lease Liabilities (Details)                            
128: R92         Supplemental Information (Details)                  HTML    117K  
129: R93         Subsequent Event - Narrative (Details)              HTML     66K  
130: R94         Subsequent Event - Estimated fair Value of the      HTML     44K  
                Consideration Associated with the Allkem Livent                  
                Merger (Details)                                                 
132: XML         IDEA XML File -- Filing Summary                      XML    209K  
135: XML         XBRL Instance -- lthm-20231231_htm                   XML   2.64M  
131: EXCEL       IDEA Workbook of Financial Report Info              XLSX    225K  
33: EX-101.CAL  XBRL Calculations -- lthm-20231231_cal               XML    360K 
34: EX-101.DEF  XBRL Definitions -- lthm-20231231_def                XML    958K 
35: EX-101.LAB  XBRL Labels -- lthm-20231231_lab                     XML   2.56M 
36: EX-101.PRE  XBRL Presentations -- lthm-20231231_pre              XML   1.61M 
32: EX-101.SCH  XBRL Schema -- lthm-20231231                         XSD    215K 
133: JSON        XBRL Instance as JSON Data -- MetaLinks              726±  1.07M  
134: ZIP         XBRL Zipped Folder -- 0001977303-24-000008-xbrl      Zip   3.07M  


‘EX-101.DEF’   —   XBRL Definitions — lthm-20231231_def


This Exhibit is an XBRL File.


                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<!-- XBRL Document Created with the Workiva Platform -->
<!-- Copyright 2024 Workiva -->
<!-- r:63d95ea2-7fbb-444f-9c1f-583bc7cbaaf1,g:88be913f-5d25-493e-a8a5-d51a0368ab8c -->
<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.fmclithium.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="simple" xlink:href="lthm-20231231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_cc9869fd-4c74-4de3-b41f-57acebab3bee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_e640de62-e93a-402e-9bb1-c3704f77d825" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_cc9869fd-4c74-4de3-b41f-57acebab3bee" xlink:to="loc_us-gaap_StatementTable_e640de62-e93a-402e-9bb1-c3704f77d825" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_e640de62-e93a-402e-9bb1-c3704f77d825" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_4e20d1f0-c052-4e7a-908c-4518fc66e171" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_e3b5e819-6c7b-42a6-8e9d-9d2bc365e985" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_4e20d1f0-c052-4e7a-908c-4518fc66e171" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_5726554f-02fe-4561-a84d-6c9bf53ff1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4e20d1f0-c052-4e7a-908c-4518fc66e171" xlink:to="loc_us-gaap_DomesticCountryMember_5726554f-02fe-4561-a84d-6c9bf53ff1c5" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_StateAndForeignTaxAuthorityMember_b0cdf1b0-78f4-4949-a050-57e85a3c0826" xlink:href="lthm-20231231.xsd#lthm_StateAndForeignTaxAuthorityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_4e20d1f0-c052-4e7a-908c-4518fc66e171" xlink:to="loc_lthm_StateAndForeignTaxAuthorityMember_b0cdf1b0-78f4-4949-a050-57e85a3c0826" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_4619ce09-5214-42d0-98ac-b90932d1b123" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_cc9869fd-4c74-4de3-b41f-57acebab3bee" xlink:to="loc_us-gaap_InterestCostsCapitalized_4619ce09-5214-42d0-98ac-b90932d1b123" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIncomeTaxRefunds_925161a6-b783-49a4-8fe2-1c34cd7f8db5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIncomeTaxRefunds"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_cc9869fd-4c74-4de3-b41f-57acebab3bee" xlink:to="loc_us-gaap_ProceedsFromIncomeTaxRefunds_925161a6-b783-49a4-8fe2-1c34cd7f8db5" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="lthm-20231231.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b3d3d7b5-43d3-4395-bea9-ae43b55b11a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_e0343105-549c-4ff0-a984-2edd3d84c2ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b3d3d7b5-43d3-4395-bea9-ae43b55b11a2" xlink:to="loc_us-gaap_StatementTable_e0343105-549c-4ff0-a984-2edd3d84c2ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_0865781a-d1e4-4c8c-b682-f42e57f471c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_e0343105-549c-4ff0-a984-2edd3d84c2ef" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_0865781a-d1e4-4c8c-b682-f42e57f471c2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_0865781a-d1e4-4c8c-b682-f42e57f471c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0865781a-d1e4-4c8c-b682-f42e57f471c2" xlink:to="loc_us-gaap_EquityComponentDomain_0865781a-d1e4-4c8c-b682-f42e57f471c2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_0865781a-d1e4-4c8c-b682-f42e57f471c2" xlink:to="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d4c27c42-992f-4443-b6d5-c2abd83d1037" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_CommonStockMember_d4c27c42-992f-4443-b6d5-c2abd83d1037" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_11416be5-09a6-40f2-ae39-0e22b78b50dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_11416be5-09a6-40f2-ae39-0e22b78b50dc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_26ccbdeb-2318-4725-8798-2306d556972b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_RetainedEarningsMember_26ccbdeb-2318-4725-8798-2306d556972b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7846667f-7fb3-4fc7-ba5a-f5796a2c168d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7846667f-7fb3-4fc7-ba5a-f5796a2c168d" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_af9d405d-0fa7-4948-977a-d2d389dfe79b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_TreasuryStockCommonMember_af9d405d-0fa7-4948-977a-d2d389dfe79b" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_e36d3e96-e394-43c5-a355-70b8a1b3c919" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_afda127c-7de3-49cb-ac3b-7f2b09e5f147" xlink:to="loc_us-gaap_NoncontrollingInterestMember_e36d3e96-e394-43c5-a355-70b8a1b3c919" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b3d3d7b5-43d3-4395-bea9-ae43b55b11a2" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5b69d28f-e43c-4cda-9566-0e246b4dd6a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_5b69d28f-e43c-4cda-9566-0e246b4dd6a8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_e80b7dbd-5898-4d9d-bff4-ee4ad1a71847" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_ProfitLoss_e80b7dbd-5898-4d9d-bff4-ee4ad1a71847" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7440ae1c-37c5-4a7e-b64b-3453b6057480" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7440ae1c-37c5-4a7e-b64b-3453b6057480" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_733c2879-d68d-43cc-a4ab-7b6de3b61425" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_733c2879-d68d-43cc-a4ab-7b6de3b61425" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_8b28c570-1d5a-4d88-9bbd-ec2c129ad13a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_8b28c570-1d5a-4d88-9bbd-ec2c129ad13a" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_9d0eb211-3ce6-4f3e-a281-5a2f71701a3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_9d0eb211-3ce6-4f3e-a281-5a2f71701a3b" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_b07ee529-dc72-4bdd-b6e7-348c50783567" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_b07ee529-dc72-4bdd-b6e7-348c50783567" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_48f4bd91-7b26-4fa0-9389-bcbbd6d90c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_48f4bd91-7b26-4fa0-9389-bcbbd6d90c8d" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_1467bf0d-4d73-4e51-b2e5-a4572e3818a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_1467bf0d-4d73-4e51-b2e5-a4572e3818a0" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_4822ac59-7ea9-4ebf-937e-04a724f68743" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_4822ac59-7ea9-4ebf-937e-04a724f68743" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_69d152c0-0ca5-4020-b7e6-b195289d62e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ed3d28e6-74f7-4f4f-b1ee-3dc23aff8e00" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_69d152c0-0ca5-4020-b7e6-b195289d62e2" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_7fc32949-b5da-47c7-bf1f-d5905eb2c70c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/PrincipalAccountingPoliciesandRelatedFinancialInformationPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#PrincipalAccountingPoliciesandRelatedFinancialInformationPropertyPlantandEquipmentDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/PrincipalAccountingPoliciesandRelatedFinancialInformationPropertyPlantandEquipmentDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_lthm_SignificantAccountingPoliciesLineItems_bc3689b8-cdda-4c5b-b415-0f26d18689cd" xlink:href="lthm-20231231.xsd#lthm_SignificantAccountingPoliciesLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_SignificantAccountingPoliciesTable_dc731a8c-c2fc-4e7d-8ba5-86aecf1ac3ca" xlink:href="lthm-20231231.xsd#lthm_SignificantAccountingPoliciesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_bc3689b8-cdda-4c5b-b415-0f26d18689cd" xlink:to="loc_lthm_SignificantAccountingPoliciesTable_dc731a8c-c2fc-4e7d-8ba5-86aecf1ac3ca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_dc731a8c-c2fc-4e7d-8ba5-86aecf1ac3ca" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad5ada2c-cdd0-40b5-9a59-9833a37a9cba" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovementsMember_64d22731-0355-4e5e-bdc1-f0c1a4f86d34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandImprovementsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:to="loc_us-gaap_LandImprovementsMember_64d22731-0355-4e5e-bdc1-f0c1a4f86d34" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_68e3d6cf-06d5-42f9-bcd7-33dc8c54144a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:to="loc_us-gaap_BuildingMember_68e3d6cf-06d5-42f9-bcd7-33dc8c54144a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_MiningRightsMember_cf4b2d44-09f6-4fc4-9533-dc0373af62ef" xlink:href="lthm-20231231.xsd#lthm_MiningRightsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:to="loc_lthm_MiningRightsMember_cf4b2d44-09f6-4fc4-9533-dc0373af62ef" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_15c1f4fd-8da7-4897-8ffe-940546b45c1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_15c1f4fd-8da7-4897-8ffe-940546b45c1b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_d0ed676e-a9ff-4c89-9ce6-b25504f7f841" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_299a3a90-ea17-4f65-8261-1577071f6050" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_d0ed676e-a9ff-4c89-9ce6-b25504f7f841" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_643257c1-476e-417b-8ee3-f5c341fffcfd" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_dc731a8c-c2fc-4e7d-8ba5-86aecf1ac3ca" xlink:to="loc_srt_RangeAxis_643257c1-476e-417b-8ee3-f5c341fffcfd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_643257c1-476e-417b-8ee3-f5c341fffcfd_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_643257c1-476e-417b-8ee3-f5c341fffcfd" xlink:to="loc_srt_RangeMember_643257c1-476e-417b-8ee3-f5c341fffcfd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_96b98981-5680-437a-999b-496902991c11" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_643257c1-476e-417b-8ee3-f5c341fffcfd" xlink:to="loc_srt_RangeMember_96b98981-5680-437a-999b-496902991c11" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_57f53c5f-1153-41ba-8684-3f99d8c2d803" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_96b98981-5680-437a-999b-496902991c11" xlink:to="loc_srt_MinimumMember_57f53c5f-1153-41ba-8684-3f99d8c2d803" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_afe41458-11e6-4275-a185-857b93d8c834" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_96b98981-5680-437a-999b-496902991c11" xlink:to="loc_srt_MaximumMember_afe41458-11e6-4275-a185-857b93d8c834" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d59b1784-3b10-4bd4-9eef-edee5000c6ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_bc3689b8-cdda-4c5b-b415-0f26d18689cd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d59b1784-3b10-4bd4-9eef-edee5000c6ca" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/PrincipalAccountingPoliciesandRelatedFinancialInformationNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#PrincipalAccountingPoliciesandRelatedFinancialInformationNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/PrincipalAccountingPoliciesandRelatedFinancialInformationNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:href="lthm-20231231.xsd#lthm_SignificantAccountingPoliciesLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:href="lthm-20231231.xsd#lthm_SignificantAccountingPoliciesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_9a659a42-bd56-4662-8fed-425e1fd46bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:to="loc_us-gaap_DebtInstrumentAxis_9a659a42-bd56-4662-8fed-425e1fd46bd3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9a659a42-bd56-4662-8fed-425e1fd46bd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_9a659a42-bd56-4662-8fed-425e1fd46bd3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9a659a42-bd56-4662-8fed-425e1fd46bd3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ccdae756-f7f0-45d1-80f0-221791e873ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_9a659a42-bd56-4662-8fed-425e1fd46bd3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ccdae756-f7f0-45d1-80f0-221791e873ee" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ConvertibleSeniorNotesDue2025Member_2cc8b1f3-f319-43f0-98a5-9148807d4f9f" xlink:href="lthm-20231231.xsd#lthm_ConvertibleSeniorNotesDue2025Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ccdae756-f7f0-45d1-80f0-221791e873ee" xlink:to="loc_lthm_ConvertibleSeniorNotesDue2025Member_2cc8b1f3-f319-43f0-98a5-9148807d4f9f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_98cf96d4-0757-4f2e-85df-20812c96eddf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_98cf96d4-0757-4f2e-85df-20812c96eddf" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_98cf96d4-0757-4f2e-85df-20812c96eddf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_98cf96d4-0757-4f2e-85df-20812c96eddf" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_98cf96d4-0757-4f2e-85df-20812c96eddf_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_23cfdd2e-2ed4-453f-a225-416263fd870a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_98cf96d4-0757-4f2e-85df-20812c96eddf" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_23cfdd2e-2ed4-453f-a225-416263fd870a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_e35af5eb-4bf6-4d42-989d-8e8c94908dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_23cfdd2e-2ed4-453f-a225-416263fd870a" xlink:to="loc_us-gaap_ConvertibleDebtMember_e35af5eb-4bf6-4d42-989d-8e8c94908dd0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_af1502c7-e5f9-4bfa-986f-d4290128ddfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_af1502c7-e5f9-4bfa-986f-d4290128ddfb" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_af1502c7-e5f9-4bfa-986f-d4290128ddfb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_af1502c7-e5f9-4bfa-986f-d4290128ddfb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_af1502c7-e5f9-4bfa-986f-d4290128ddfb_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e133f819-c09a-4113-8a9b-0defcdbcacc1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_af1502c7-e5f9-4bfa-986f-d4290128ddfb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e133f819-c09a-4113-8a9b-0defcdbcacc1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_e887e6d2-e52c-4214-957f-393883d41090" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PatentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e133f819-c09a-4113-8a9b-0defcdbcacc1" xlink:to="loc_us-gaap_PatentsMember_e887e6d2-e52c-4214-957f-393883d41090" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d7b42491-9a85-482a-a242-9f8c2bdf033b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_lthm_SignificantAccountingPoliciesTable_e03ce1c5-a322-4b87-8830-98bd9cfcce49" xlink:to="loc_srt_RangeAxis_d7b42491-9a85-482a-a242-9f8c2bdf033b" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d7b42491-9a85-482a-a242-9f8c2bdf033b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d7b42491-9a85-482a-a242-9f8c2bdf033b" xlink:to="loc_srt_RangeMember_d7b42491-9a85-482a-a242-9f8c2bdf033b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8ca900c2-4718-41e3-93df-fe2f0a0a4ef6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d7b42491-9a85-482a-a242-9f8c2bdf033b" xlink:to="loc_srt_RangeMember_8ca900c2-4718-41e3-93df-fe2f0a0a4ef6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1c3aed01-0187-42a4-9ad8-0389dbd249ea" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8ca900c2-4718-41e3-93df-fe2f0a0a4ef6" xlink:to="loc_srt_MinimumMember_1c3aed01-0187-42a4-9ad8-0389dbd249ea" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_64d9bd91-e1d2-425f-b84e-db795b4db4e4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8ca900c2-4718-41e3-93df-fe2f0a0a4ef6" xlink:to="loc_srt_MaximumMember_64d9bd91-e1d2-425f-b84e-db795b4db4e4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_f611cfa9-9214-4b6a-830e-5588c60f2f52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_InterestCostsCapitalized_f611cfa9-9214-4b6a-830e-5588c60f2f52" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligation_086e7e94-247f-4ba0-8ea7-d437e4935f36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetRetirementObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_AssetRetirementObligation_086e7e94-247f-4ba0-8ea7-d437e4935f36" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_90ba905d-de11-47d2-baf7-9847f562cc0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_90ba905d-de11-47d2-baf7-9847f562cc0d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_4a88a2b7-bd88-486d-b66b-37f11813c1f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_4a88a2b7-bd88-486d-b66b-37f11813c1f8" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_41f7184b-ccab-4a97-9bb6-49b76cff2874" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_Goodwill_41f7184b-ccab-4a97-9bb6-49b76cff2874" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ContractWithCustomerStandardPaymentTerm_3cc76da0-c7e8-450c-a650-6439a9cd19f3" xlink:href="lthm-20231231.xsd#lthm_ContractWithCustomerStandardPaymentTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_lthm_ContractWithCustomerStandardPaymentTerm_3cc76da0-c7e8-450c-a650-6439a9cd19f3" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_9cb1dc40-ceed-478d-b581-3283e0e6d640" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_NumberOfReportableSegments_9cb1dc40-ceed-478d-b581-3283e0e6d640" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NumberOfEnvironmentalRemediationSites_162c61a8-1891-473b-9514-2321541a2750" xlink:href="lthm-20231231.xsd#lthm_NumberOfEnvironmentalRemediationSites"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_lthm_NumberOfEnvironmentalRemediationSites_162c61a8-1891-473b-9514-2321541a2750" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_38147d70-a27c-438d-ba36-9b9ff3bf0fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_38147d70-a27c-438d-ba36-9b9ff3bf0fc5" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_bb2006d6-8c38-4106-a673-998896313d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccrualForEnvironmentalLossContingencies"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_bb2006d6-8c38-4106-a673-998896313d6c" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2e129c33-6c83-4e75-8cc2-c118d3f6bc63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_2e129c33-6c83-4e75-8cc2-c118d3f6bc63" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingGainsLosses_d448a744-63fa-451a-ae6f-6f6bd5044f59" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingGainsLosses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_SignificantAccountingPoliciesLineItems_f9931315-9033-4d71-91a5-b0e9b1d61c09" xlink:to="loc_us-gaap_OtherNonoperatingGainsLosses_d448a744-63fa-451a-ae6f-6f6bd5044f59" xlink:type="arc" order="11"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionRevenueByMajorGeographicalRegionDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionRevenueByMajorGeographicalRegionDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionRevenueByMajorGeographicalRegionDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_f9b28dc0-30e5-4fd4-9001-f6312e256992" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_9048fecf-e24c-4c50-9ae8-90ac92280921" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_f9b28dc0-30e5-4fd4-9001-f6312e256992" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_9048fecf-e24c-4c50-9ae8-90ac92280921" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_5c18d5e4-c074-45e8-aeea-76f4e3c6acec" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_9048fecf-e24c-4c50-9ae8-90ac92280921" xlink:to="loc_srt_StatementGeographicalAxis_5c18d5e4-c074-45e8-aeea-76f4e3c6acec" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5c18d5e4-c074-45e8-aeea-76f4e3c6acec_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_5c18d5e4-c074-45e8-aeea-76f4e3c6acec" xlink:to="loc_srt_SegmentGeographicalDomain_5c18d5e4-c074-45e8-aeea-76f4e3c6acec_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_5c18d5e4-c074-45e8-aeea-76f4e3c6acec" xlink:to="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_e5b6182c-148c-4cbf-8326-163f21014cd9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaPacificMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_srt_AsiaPacificMember_e5b6182c-148c-4cbf-8326-163f21014cd9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_6e209af9-4875-4a89-b5ac-483d45788a7d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NorthAmericaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_srt_NorthAmericaMember_6e209af9-4875-4a89-b5ac-483d45788a7d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_b7dfebe2-4de6-4799-a656-b89512efb209" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_us-gaap_EMEAMember_b7dfebe2-4de6-4799-a656-b89512efb209" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_LatinAmericaMember_9bd1f04f-01ff-4cf2-a8fa-ad8a4b81b140" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LatinAmericaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_srt_LatinAmericaMember_9bd1f04f-01ff-4cf2-a8fa-ad8a4b81b140" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_country_CN_07555a02-9bb8-4e87-969a-28ba4d6fedfe" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CN"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_country_CN_07555a02-9bb8-4e87-969a-28ba4d6fedfe" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_country_US_a2c00907-5a2c-4a51-bfcb-a3b9f3829af3" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_country_US_a2c00907-5a2c-4a51-bfcb-a3b9f3829af3" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_country_JP_6f5039ad-2153-4a97-be66-ef89ea781b4e" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_JP"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_country_JP_6f5039ad-2153-4a97-be66-ef89ea781b4e" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_country_KP_46fceef4-6153-42b4-b12e-8109bcdecd0b" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_KP"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_00cac5d0-0fb9-40f4-99ea-7b6f7cfc2d6c" xlink:to="loc_country_KP_46fceef4-6153-42b4-b12e-8109bcdecd0b" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ff5bcc88-928d-4b2b-a554-98952dbb4e43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_f9b28dc0-30e5-4fd4-9001-f6312e256992" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_ff5bcc88-928d-4b2b-a554-98952dbb4e43" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_9fe7692a-6c34-4b1a-a665-11b10de6a0bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9fe7692a-6c34-4b1a-a665-11b10de6a0bf" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_cc58f2c8-21ca-41b0-836e-181ccb841067" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MajorCustomersAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:to="loc_srt_MajorCustomersAxis_cc58f2c8-21ca-41b0-836e-181ccb841067" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_cc58f2c8-21ca-41b0-836e-181ccb841067_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_cc58f2c8-21ca-41b0-836e-181ccb841067" xlink:to="loc_srt_NameOfMajorCustomerDomain_cc58f2c8-21ca-41b0-836e-181ccb841067_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_cc58f2c8-21ca-41b0-836e-181ccb841067" xlink:to="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TwoCustomersOneMember_ca102aba-0e28-4e1e-82f0-ea9e34ff8112" xlink:href="lthm-20231231.xsd#lthm_TwoCustomersOneMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:to="loc_lthm_TwoCustomersOneMember_ca102aba-0e28-4e1e-82f0-ea9e34ff8112" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TwoCustomersTwoMember_ec6227be-99f2-4db2-a762-c8afe0d51e78" xlink:href="lthm-20231231.xsd#lthm_TwoCustomersTwoMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:to="loc_lthm_TwoCustomersTwoMember_ec6227be-99f2-4db2-a762-c8afe0d51e78" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TenLargestCustomersMember_cb59b2e4-acd2-4378-89e5-9df6f114b670" xlink:href="lthm-20231231.xsd#lthm_TenLargestCustomersMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:to="loc_lthm_TenLargestCustomersMember_cb59b2e4-acd2-4378-89e5-9df6f114b670" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CustomerOneMember_d511ae96-71a0-43ce-a23e-45db54f26f84" xlink:href="lthm-20231231.xsd#lthm_CustomerOneMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_ba730cdc-58da-49c4-87fa-97394985b4c4" xlink:to="loc_lthm_CustomerOneMember_d511ae96-71a0-43ce-a23e-45db54f26f84" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_919949ec-3773-4a3b-9789-6019a773f630" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2c4a6726-2ee2-4a22-b14a-00c36abb6ea2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_919949ec-3773-4a3b-9789-6019a773f630" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_1ca972e2-6927-4aff-8577-4c25152d80cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_919949ec-3773-4a3b-9789-6019a773f630" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_1ca972e2-6927-4aff-8577-4c25152d80cd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4faf47b3-2c8b-4363-90b0-902764b27922" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:to="loc_srt_RangeAxis_4faf47b3-2c8b-4363-90b0-902764b27922" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4faf47b3-2c8b-4363-90b0-902764b27922_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4faf47b3-2c8b-4363-90b0-902764b27922" xlink:to="loc_srt_RangeMember_4faf47b3-2c8b-4363-90b0-902764b27922_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d14c96a0-7d11-4d7e-a82c-a9a464e8ee37" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4faf47b3-2c8b-4363-90b0-902764b27922" xlink:to="loc_srt_RangeMember_d14c96a0-7d11-4d7e-a82c-a9a464e8ee37" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ad48c9e9-b3b1-4906-bac0-abccb733a4e8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d14c96a0-7d11-4d7e-a82c-a9a464e8ee37" xlink:to="loc_srt_MinimumMember_ad48c9e9-b3b1-4906-bac0-abccb733a4e8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1ccc12c4-4892-49f6-82be-1c7b7095b962" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d14c96a0-7d11-4d7e-a82c-a9a464e8ee37" xlink:to="loc_srt_MaximumMember_1ccc12c4-4892-49f6-82be-1c7b7095b962" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_f109ebc1-3cf7-4493-ac8c-059fd3be27b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_e0cdb580-3bf3-4522-a99b-d03eea0d6f85" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_f109ebc1-3cf7-4493-ac8c-059fd3be27b2" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_f109ebc1-3cf7-4493-ac8c-059fd3be27b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f109ebc1-3cf7-4493-ac8c-059fd3be27b2" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_f109ebc1-3cf7-4493-ac8c-059fd3be27b2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_0ff3f626-158f-4513-84db-1dcae7520ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f109ebc1-3cf7-4493-ac8c-059fd3be27b2" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_0ff3f626-158f-4513-84db-1dcae7520ec4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_55a10263-9072-4d31-846e-212717f6d602" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerConcentrationRiskMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_0ff3f626-158f-4513-84db-1dcae7520ec4" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_55a10263-9072-4d31-846e-212717f6d602" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_f60dc47c-840b-4dcc-8ffe-7ad58ba07351" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9fe7692a-6c34-4b1a-a665-11b10de6a0bf" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_f60dc47c-840b-4dcc-8ffe-7ad58ba07351" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ContractWithCustomerStandardPaymentTerm_fbfd9870-b705-46a9-a515-40f399403755" xlink:href="lthm-20231231.xsd#lthm_ContractWithCustomerStandardPaymentTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9fe7692a-6c34-4b1a-a665-11b10de6a0bf" xlink:to="loc_lthm_ContractWithCustomerStandardPaymentTerm_fbfd9870-b705-46a9-a515-40f399403755" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_63263e0f-8769-4833-bc21-d701175eda52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9fe7692a-6c34-4b1a-a665-11b10de6a0bf" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_63263e0f-8769-4833-bc21-d701175eda52" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionRevenueByMajorProductCategoryDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionRevenueByMajorProductCategoryDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionRevenueByMajorProductCategoryDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_ec413cbb-1285-4763-b7d1-fafce156c52f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8c2cd28a-4196-4862-aa6c-3c0ba91afbc9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_ec413cbb-1285-4763-b7d1-fafce156c52f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8c2cd28a-4196-4862-aa6c-3c0ba91afbc9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_cb1f3053-e245-40db-96ea-d8175ae0f6fc" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8c2cd28a-4196-4862-aa6c-3c0ba91afbc9" xlink:to="loc_srt_ProductOrServiceAxis_cb1f3053-e245-40db-96ea-d8175ae0f6fc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cb1f3053-e245-40db-96ea-d8175ae0f6fc_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_cb1f3053-e245-40db-96ea-d8175ae0f6fc" xlink:to="loc_srt_ProductsAndServicesDomain_cb1f3053-e245-40db-96ea-d8175ae0f6fc_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_cb1f3053-e245-40db-96ea-d8175ae0f6fc" xlink:to="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_LithiumHydroxideMember_ad667a30-3ea1-496f-b4f1-2944d5ef838d" xlink:href="lthm-20231231.xsd#lthm_LithiumHydroxideMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:to="loc_lthm_LithiumHydroxideMember_ad667a30-3ea1-496f-b4f1-2944d5ef838d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ButyllithiumMember_c821143a-95a7-476c-b0a1-ce82ce89ff9c" xlink:href="lthm-20231231.xsd#lthm_ButyllithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:to="loc_lthm_ButyllithiumMember_c821143a-95a7-476c-b0a1-ce82ce89ff9c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_HighPurityLithiumMetalandOtherSpecialtyCompoundsMember_79403edd-05d5-451a-81a1-81dbb07ef612" xlink:href="lthm-20231231.xsd#lthm_HighPurityLithiumMetalandOtherSpecialtyCompoundsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:to="loc_lthm_HighPurityLithiumMetalandOtherSpecialtyCompoundsMember_79403edd-05d5-451a-81a1-81dbb07ef612" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_LithiumCarbonateLithiumChlorideMember_9d58c74d-81ac-4adb-b2d7-19ecc5a77c21" xlink:href="lthm-20231231.xsd#lthm_LithiumCarbonateLithiumChlorideMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_828adc6a-1d1c-4976-8142-285dff3409f5" xlink:to="loc_lthm_LithiumCarbonateLithiumChlorideMember_9d58c74d-81ac-4adb-b2d7-19ecc5a77c21" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_32fe14ea-7f3a-413e-a929-1dce2851b272" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_ec413cbb-1285-4763-b7d1-fafce156c52f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_32fe14ea-7f3a-413e-a929-1dce2851b272" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionAssetsandLiabilitiesDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionAssetsandLiabilitiesDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_ccba5d2a-2f67-4270-94b6-23b2e8f71ee8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_ccba5d2a-2f67-4270-94b6-23b2e8f71ee8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_37f47af4-d318-4183-bd81-e6f1b34ed294" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_ccba5d2a-2f67-4270-94b6-23b2e8f71ee8" xlink:to="loc_srt_RestatementAxis_37f47af4-d318-4183-bd81-e6f1b34ed294" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_37f47af4-d318-4183-bd81-e6f1b34ed294_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_37f47af4-d318-4183-bd81-e6f1b34ed294" xlink:to="loc_srt_RestatementDomain_37f47af4-d318-4183-bd81-e6f1b34ed294_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f74a4ca9-eb6d-4427-a567-1a910ac92ccb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_37f47af4-d318-4183-bd81-e6f1b34ed294" xlink:to="loc_srt_RestatementDomain_f74a4ca9-eb6d-4427-a567-1a910ac92ccb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_356a5b91-77cd-4e42-a4d7-345c7c4e4d24" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f74a4ca9-eb6d-4427-a567-1a910ac92ccb" xlink:to="loc_srt_RestatementAdjustmentMember_356a5b91-77cd-4e42-a4d7-345c7c4e4d24" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_7d769e5e-404e-4f8f-ae11-628f17aea27a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_7d769e5e-404e-4f8f-ae11-628f17aea27a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_ac53b6b9-3960-4abd-967c-4e438ad349fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_ac53b6b9-3960-4abd-967c-4e438ad349fa" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_fc1002da-5f52-4e39-b822-dde768167473" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_fc1002da-5f52-4e39-b822-dde768167473" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ContractWithCustomerIncreaseDecreaseInAccountsReceivable_2236b897-141d-4d45-bb54-a30176537e70" xlink:href="lthm-20231231.xsd#lthm_ContractWithCustomerIncreaseDecreaseInAccountsReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_lthm_ContractWithCustomerIncreaseDecreaseInAccountsReceivable_2236b897-141d-4d45-bb54-a30176537e70" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_IncreaseDecreaseInContractWithCustomerLiabilityCurrent_b895ee7a-e7ef-453d-8308-33b2de04d438" xlink:href="lthm-20231231.xsd#lthm_IncreaseDecreaseInContractWithCustomerLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_lthm_IncreaseDecreaseInContractWithCustomerLiabilityCurrent_b895ee7a-e7ef-453d-8308-33b2de04d438" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_IncreaseDecreaseInContractWithCustomerLiabilityNonCurrent_aac8a6d0-038d-4f92-8fbe-c6db2801d1b6" xlink:href="lthm-20231231.xsd#lthm_IncreaseDecreaseInContractWithCustomerLiabilityNonCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_6f5687ce-3723-4aca-ae37-3c2de626d319" xlink:to="loc_lthm_IncreaseDecreaseInContractWithCustomerLiabilityNonCurrent_aac8a6d0-038d-4f92-8fbe-c6db2801d1b6" xlink:type="arc" order="5"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionPerformanceObligationsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionPerformanceObligationsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionPerformanceObligationsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_110ab046-1ea7-4815-a2f6-be3c020467cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_110ab046-1ea7-4815-a2f6-be3c020467cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_bd469d48-01bb-432d-a6e4-0df0643da94e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_110ab046-1ea7-4815-a2f6-be3c020467cd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_bd469d48-01bb-432d-a6e4-0df0643da94e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_315e46b6-2550-44ee-abf8-b94ac52cbc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_315e46b6-2550-44ee-abf8-b94ac52cbc0a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_f9e988cf-9975-43af-ab06-e9bae5ad2244" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_f9e988cf-9975-43af-ab06-e9bae5ad2244" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RevenueRecognitionPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="lthm-20231231.xsd#RevenueRecognitionPerformanceObligationsDetails_1"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RevenueRecognitionPerformanceObligationsDetails_1" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_110ab046-1ea7-4815-a2f6-be3c020467cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_110ab046-1ea7-4815-a2f6-be3c020467cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_315e46b6-2550-44ee-abf8-b94ac52cbc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_315e46b6-2550-44ee-abf8-b94ac52cbc0a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_f9e988cf-9975-43af-ab06-e9bae5ad2244" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_fb5cf1cf-b713-4901-ba21-3e2d2fa19c12" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_f9e988cf-9975-43af-ab06-e9bae5ad2244" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/InvestmentsNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#InvestmentsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/InvestmentsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_a2ad7794-acf1-40ee-a470-79a2c5b95b34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_a2ad7794-acf1-40ee-a470-79a2c5b95b34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e6f186f2-7ce4-47db-94bd-4d5bc52dd993" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_a2ad7794-acf1-40ee-a470-79a2c5b95b34" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e6f186f2-7ce4-47db-94bd-4d5bc52dd993" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e6f186f2-7ce4-47db-94bd-4d5bc52dd993_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e6f186f2-7ce4-47db-94bd-4d5bc52dd993" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e6f186f2-7ce4-47db-94bd-4d5bc52dd993_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_47b0461b-784d-463b-b2ca-2d3eff5a4b20" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e6f186f2-7ce4-47db-94bd-4d5bc52dd993" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_47b0461b-784d-463b-b2ca-2d3eff5a4b20" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ESMILiADLLCMember_86aab551-e9a7-4f41-8dfe-348beb0ad0d4" xlink:href="lthm-20231231.xsd#lthm_ESMILiADLLCMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_47b0461b-784d-463b-b2ca-2d3eff5a4b20" xlink:to="loc_lthm_ESMILiADLLCMember_86aab551-e9a7-4f41-8dfe-348beb0ad0d4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NemaskaLithiumMember_b023a10b-9a54-4577-8bef-52acd0164997" xlink:href="lthm-20231231.xsd#lthm_NemaskaLithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_47b0461b-784d-463b-b2ca-2d3eff5a4b20" xlink:to="loc_lthm_NemaskaLithiumMember_b023a10b-9a54-4577-8bef-52acd0164997" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5a0337ff-58fb-474e-845d-7c951f6c3477" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_a2ad7794-acf1-40ee-a470-79a2c5b95b34" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5a0337ff-58fb-474e-845d-7c951f6c3477" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5a0337ff-58fb-474e-845d-7c951f6c3477_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5a0337ff-58fb-474e-845d-7c951f6c3477" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5a0337ff-58fb-474e-845d-7c951f6c3477_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_522af0bd-f154-4364-a5a5-6405eb3bc0d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5a0337ff-58fb-474e-845d-7c951f6c3477" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_522af0bd-f154-4364-a5a5-6405eb3bc0d4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_QuebecLithiumPartnersUKMember_bcccdcbf-df3c-4da7-807d-e19cecef16e1" xlink:href="lthm-20231231.xsd#lthm_QuebecLithiumPartnersUKMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_522af0bd-f154-4364-a5a5-6405eb3bc0d4" xlink:to="loc_lthm_QuebecLithiumPartnersUKMember_bcccdcbf-df3c-4da7-807d-e19cecef16e1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_a2ad7794-acf1-40ee-a470-79a2c5b95b34" xlink:to="loc_dei_LegalEntityAxis_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a" xlink:to="loc_dei_EntityDomain_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0e0b1e54-fa2e-47c4-9527-0bb9476ec96e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0fad1ad9-f84b-49bc-83ea-f35f76f63d1a" xlink:to="loc_dei_EntityDomain_0e0b1e54-fa2e-47c4-9527-0bb9476ec96e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CanadianGovernmentMember_9409d50f-cfd5-4f9a-a2e5-925ae926fc9d" xlink:href="lthm-20231231.xsd#lthm_CanadianGovernmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_0e0b1e54-fa2e-47c4-9527-0bb9476ec96e" xlink:to="loc_lthm_CanadianGovernmentMember_9409d50f-cfd5-4f9a-a2e5-925ae926fc9d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_fcfc3053-fa6d-407d-9c50-e1189bfb5a08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_fcfc3053-fa6d-407d-9c50-e1189bfb5a08" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_e22b16e0-b121-4893-9dc6-01caac1c2c29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_e22b16e0-b121-4893-9dc6-01caac1c2c29" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_be2dbf82-200c-4b01-9dc2-d5abc05ec273" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_be2dbf82-200c-4b01-9dc2-d5abc05ec273" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6bd4f019-18cc-468e-93d9-2fcb29280db8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6bd4f019-18cc-468e-93d9-2fcb29280db8" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_6e6ab723-58f6-4e3f-bc0c-9b2c71ee291a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_EquityMethodInvestments_6e6ab723-58f6-4e3f-bc0c-9b2c71ee291a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_77bfe40f-2611-4c94-afad-a43eacb65206" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_77bfe40f-2611-4c94-afad-a43eacb65206" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermDebt_c0a7406d-c50f-4277-97f5-59b5f2fb4ed1" xlink:href="lthm-20231231.xsd#lthm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_lthm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermDebt_c0a7406d-c50f-4277-97f5-59b5f2fb4ed1" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_AdditionalPaidInCapitalAcquisitions_87522ef3-0045-4d17-8c6e-4def6c0971aa" xlink:href="lthm-20231231.xsd#lthm_AdditionalPaidInCapitalAcquisitions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_lthm_AdditionalPaidInCapitalAcquisitions_87522ef3-0045-4d17-8c6e-4def6c0971aa" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_51842d96-b5fb-4f95-83dd-bc813097c9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1d716b94-a7e6-485d-b7c2-58aa6f6c045a" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_51842d96-b5fb-4f95-83dd-bc813097c9a2" xlink:type="arc" order="8"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/InvestmentsSummarizedFinancialInformationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#InvestmentsSummarizedFinancialInformationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/InvestmentsSummarizedFinancialInformationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_d351b332-f00b-4e0b-bc85-a6ab3d6b6848" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_d351b332-f00b-4e0b-bc85-a6ab3d6b6848" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_7d34c1c2-424f-467f-9b22-0f34d16d3beb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_d351b332-f00b-4e0b-bc85-a6ab3d6b6848" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_7d34c1c2-424f-467f-9b22-0f34d16d3beb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_7d34c1c2-424f-467f-9b22-0f34d16d3beb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_7d34c1c2-424f-467f-9b22-0f34d16d3beb" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_7d34c1c2-424f-467f-9b22-0f34d16d3beb_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_640929db-158a-4788-afc4-7bda2ca4610a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_7d34c1c2-424f-467f-9b22-0f34d16d3beb" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_640929db-158a-4788-afc4-7bda2ca4610a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NemaskaLithiumMember_2aa93617-1e3f-49c8-96a2-545477fd1b58" xlink:href="lthm-20231231.xsd#lthm_NemaskaLithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_640929db-158a-4788-afc4-7bda2ca4610a" xlink:to="loc_lthm_NemaskaLithiumMember_2aa93617-1e3f-49c8-96a2-545477fd1b58" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_58970ab0-5a24-46b0-bfc6-58968289878a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_d351b332-f00b-4e0b-bc85-a6ab3d6b6848" xlink:to="loc_us-gaap_DebtInstrumentAxis_58970ab0-5a24-46b0-bfc6-58968289878a" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_58970ab0-5a24-46b0-bfc6-58968289878a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_58970ab0-5a24-46b0-bfc6-58968289878a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_58970ab0-5a24-46b0-bfc6-58968289878a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_de613e31-3302-4ed1-8fad-4172eaadecf0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_58970ab0-5a24-46b0-bfc6-58968289878a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_de613e31-3302-4ed1-8fad-4172eaadecf0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_OrionPromissoryNoteMember_c48c3e4e-dd2e-4384-9c4f-5598e640d1af" xlink:href="lthm-20231231.xsd#lthm_OrionPromissoryNoteMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_de613e31-3302-4ed1-8fad-4172eaadecf0" xlink:to="loc_lthm_OrionPromissoryNoteMember_c48c3e4e-dd2e-4384-9c4f-5598e640d1af" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_UnsecuredObligationMember_25e36938-02f5-40a9-8272-94f5add332d4" xlink:href="lthm-20231231.xsd#lthm_UnsecuredObligationMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_de613e31-3302-4ed1-8fad-4172eaadecf0" xlink:to="loc_lthm_UnsecuredObligationMember_25e36938-02f5-40a9-8272-94f5add332d4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_PrepaymentAgreementMember_2241e4ec-8c8d-4df8-baf3-86f08f99c824" xlink:href="lthm-20231231.xsd#lthm_PrepaymentAgreementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_de613e31-3302-4ed1-8fad-4172eaadecf0" xlink:to="loc_lthm_PrepaymentAgreementMember_2241e4ec-8c8d-4df8-baf3-86f08f99c824" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_59242683-a0e0-430f-8066-f42671e7bf92" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_d351b332-f00b-4e0b-bc85-a6ab3d6b6848" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_59242683-a0e0-430f-8066-f42671e7bf92" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_59242683-a0e0-430f-8066-f42671e7bf92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_59242683-a0e0-430f-8066-f42671e7bf92" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_59242683-a0e0-430f-8066-f42671e7bf92_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e42ad4f1-f957-4b91-a380-14f0422bac09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_59242683-a0e0-430f-8066-f42671e7bf92" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e42ad4f1-f957-4b91-a380-14f0422bac09" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8554bc93-1c3e-4025-9287-99ad67a63a36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e42ad4f1-f957-4b91-a380-14f0422bac09" xlink:to="loc_us-gaap_SeniorNotesMember_8554bc93-1c3e-4025-9287-99ad67a63a36" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_7941b650-6a6c-4a0a-9750-e9c69a8d23b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnsecuredDebtMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e42ad4f1-f957-4b91-a380-14f0422bac09" xlink:to="loc_us-gaap_UnsecuredDebtMember_7941b650-6a6c-4a0a-9750-e9c69a8d23b9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_8e55c1eb-d9c6-43a2-9649-ef7f392e1339" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_8e55c1eb-d9c6-43a2-9649-ef7f392e1339" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_SalesAndExciseTaxReceivableCurrent_53a0c328-0121-49fb-bea2-c7e1baca8e42" xlink:href="lthm-20231231.xsd#lthm_SalesAndExciseTaxReceivableCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_lthm_SalesAndExciseTaxReceivableCurrent_53a0c328-0121-49fb-bea2-c7e1baca8e42" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_ba6b6f53-3dea-4684-9935-85181896474b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_ba6b6f53-3dea-4684-9935-85181896474b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_f1545e7f-8a27-4c12-a79d-d0b326c00d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_OtherAssetsCurrent_f1545e7f-8a27-4c12-a79d-d0b326c00d2d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_e6af0c7b-9aea-4306-89cc-5997f8732988" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_e6af0c7b-9aea-4306-89cc-5997f8732988" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_2be61cec-eb13-4377-a2e1-f3e49b33028a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_AssetsCurrent_2be61cec-eb13-4377-a2e1-f3e49b33028a" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldInTrust_462a213b-2037-4301-af5f-103df9b1081c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsHeldInTrust"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_AssetsHeldInTrust_462a213b-2037-4301-af5f-103df9b1081c" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ce1da12b-1faf-43dd-94b9-6606a2c8ea65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ce1da12b-1faf-43dd-94b9-6606a2c8ea65" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_2566ddeb-9216-4374-89d8-4c6bd0bb5b40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_2566ddeb-9216-4374-89d8-4c6bd0bb5b40" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_78b815c4-362d-45d3-87f1-d2336548febf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_Goodwill_78b815c4-362d-45d3-87f1-d2336548febf" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_794652bc-b0e6-4abd-9ed0-2b2dcb985223" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_794652bc-b0e6-4abd-9ed0-2b2dcb985223" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_ff42d14c-8f74-4e9b-b51b-5328013d01fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_ff42d14c-8f74-4e9b-b51b-5328013d01fb" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_6e059bad-3198-4c84-a987-db292752a1de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_AssetsNoncurrent_6e059bad-3198-4c84-a987-db292752a1de" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_4c11ed25-d030-46de-9927-d1ee5ea4c889" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_d21f2be9-d615-48b1-a3bb-bd0545176e75" xlink:to="loc_us-gaap_Assets_4c11ed25-d030-46de-9927-d1ee5ea4c889" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_c311f09d-bd37-4405-a064-ee9e5c945840" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_LongTermDebtCurrent_c311f09d-bd37-4405-a064-ee9e5c945840" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_2db6fe89-4483-4196-85ff-1b39f969cb8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_2db6fe89-4483-4196-85ff-1b39f969cb8c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_a1d6fbb3-ddea-4738-b34c-7feafb33a1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_a1d6fbb3-ddea-4738-b34c-7feafb33a1cd" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_dc8b5c09-9192-4421-a1d0-19ee846003a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_LiabilitiesCurrent_dc8b5c09-9192-4421-a1d0-19ee846003a8" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_adca38be-24a7-441e-89bb-a178777a7d08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_adca38be-24a7-441e-89bb-a178777a7d08" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_966e0532-6adb-4301-8dc8-dfa8a2faedc1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_966e0532-6adb-4301-8dc8-dfa8a2faedc1" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_717d5537-fefb-41bd-9bd2-61cc381d5164" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_717d5537-fefb-41bd-9bd2-61cc381d5164" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_2b0f3d2f-5ec0-45d5-9cec-338bc1f08887" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetRetirementObligationsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_2b0f3d2f-5ec0-45d5-9cec-338bc1f08887" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_da443c94-e993-499a-aba5-365e23a498d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_da443c94-e993-499a-aba5-365e23a498d8" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_25bc190c-e968-4783-bb69-466437f66f98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_25bc190c-e968-4783-bb69-466437f66f98" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_a08e0444-8ebf-4602-bc9d-1294a07b6b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_a08e0444-8ebf-4602-bc9d-1294a07b6b2b" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_cab6f28b-fd1d-4d5b-a9f9-a9f77c8a3f26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_Liabilities_cab6f28b-fd1d-4d5b-a9f9-a9f77c8a3f26" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalUnits_e97818f2-fbcb-4a05-bb09-79067d6282fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalUnits"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_CapitalUnits_e97818f2-fbcb-4a05-bb09-79067d6282fe" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_43018e8d-2111-4f71-a687-603e0ec6c33d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_AdditionalPaidInCapital_43018e8d-2111-4f71-a687-603e0ec6c33d" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_deb48040-a5bd-438d-a88a-8e9e5d9344b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_deb48040-a5bd-438d-a88a-8e9e5d9344b2" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_cf1b9c1c-2527-430e-8ed1-5d40ea0c8341" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_StockholdersEquity_cf1b9c1c-2527-430e-8ed1-5d40ea0c8341" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_4bb5202f-2ffc-486a-9b50-863cf2106753" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_MinorityInterest_4bb5202f-2ffc-486a-9b50-863cf2106753" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ebae1c00-fbc9-46b6-84f8-8d8991bfe72c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ebae1c00-fbc9-46b6-84f8-8d8991bfe72c" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_f769a089-0667-4144-bb55-5cf2d096bb3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_30d15ec8-e85f-4606-a764-9f74c1eaea58" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_f769a089-0667-4144-bb55-5cf2d096bb3b" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_f7417dfa-c033-4e96-9e56-89b71830c38f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_f7417dfa-c033-4e96-9e56-89b71830c38f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromContributedCapital_986e43ab-d2dd-4bd0-b565-36ac011bbc83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromContributedCapital"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_ProceedsFromContributedCapital_986e43ab-d2dd-4bd0-b565-36ac011bbc83" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3e7b34b6-d463-4fb8-adcc-5310016a4fbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_3e7b34b6-d463-4fb8-adcc-5310016a4fbf" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_82ae08f2-e1ed-4c67-aefa-76b04c3407fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_82ae08f2-e1ed-4c67-aefa-76b04c3407fc" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions_353f5f13-5283-499a-a010-dbc936f9f4da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions_353f5f13-5283-499a-a010-dbc936f9f4da" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions_edbbc8b1-d90a-4518-b005-52be6c4e82f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_b800b2f6-4164-4767-9f82-805ec2464c6e" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions_edbbc8b1-d90a-4518-b005-52be6c4e82f3" xlink:type="arc" order="7"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/InvestmentsStatementofOperationsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#InvestmentsStatementofOperationsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/InvestmentsStatementofOperationsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_6c68b401-b44b-4ad4-8d22-b84aaa82f873" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_6c68b401-b44b-4ad4-8d22-b84aaa82f873" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_2a83e784-8111-4509-b0e1-99eeec822061" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_6c68b401-b44b-4ad4-8d22-b84aaa82f873" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_2a83e784-8111-4509-b0e1-99eeec822061" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_2a83e784-8111-4509-b0e1-99eeec822061_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_2a83e784-8111-4509-b0e1-99eeec822061" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_2a83e784-8111-4509-b0e1-99eeec822061_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e7e4d6eb-7f79-46df-bde8-de4c3a3c7377" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_2a83e784-8111-4509-b0e1-99eeec822061" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e7e4d6eb-7f79-46df-bde8-de4c3a3c7377" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NemaskaLithiumMember_a0b9ab1c-ce0a-4b36-b886-934e1f28adde" xlink:href="lthm-20231231.xsd#lthm_NemaskaLithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e7e4d6eb-7f79-46df-bde8-de4c3a3c7377" xlink:to="loc_lthm_NemaskaLithiumMember_a0b9ab1c-ce0a-4b36-b886-934e1f28adde" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_22756a8d-81e4-49e2-80e1-377dbb6eeff6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingExpenses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_OperatingExpenses_22756a8d-81e4-49e2-80e1-377dbb6eeff6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_27e9cac2-297f-4335-85b8-51648582b301" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_27e9cac2-297f-4335-85b8-51648582b301" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_99fecf00-4ba8-47f3-b360-f499fd112a57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_99fecf00-4ba8-47f3-b360-f499fd112a57" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a5b7d93d-144f-409d-9a1d-bd766b744042" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a5b7d93d-144f-409d-9a1d-bd766b744042" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_bd23cf09-0465-42af-9ab7-b046c20a6667" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_bd23cf09-0465-42af-9ab7-b046c20a6667" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_fbfaf700-ca53-4d37-a42c-e20283759453" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_d1e2de91-29f5-444e-a55f-db274091ba24" xlink:to="loc_us-gaap_NetIncomeLoss_fbfaf700-ca53-4d37-a42c-e20283759453" xlink:type="arc" order="5"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/InvestmentsCashFlowInformationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#InvestmentsCashFlowInformationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/InvestmentsCashFlowInformationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_23cf8110-3cf8-4dc6-af0e-12706991b9c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_23cf8110-3cf8-4dc6-af0e-12706991b9c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5e3c4be3-ec72-4d52-a559-2215b2001613" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_23cf8110-3cf8-4dc6-af0e-12706991b9c6" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5e3c4be3-ec72-4d52-a559-2215b2001613" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_5e3c4be3-ec72-4d52-a559-2215b2001613_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5e3c4be3-ec72-4d52-a559-2215b2001613" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_5e3c4be3-ec72-4d52-a559-2215b2001613_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_50940098-0200-4739-9a0d-500a036efb97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5e3c4be3-ec72-4d52-a559-2215b2001613" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_50940098-0200-4739-9a0d-500a036efb97" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NemaskaLithiumMember_a2bfd630-1c36-443a-bcb6-0816ec983a12" xlink:href="lthm-20231231.xsd#lthm_NemaskaLithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_50940098-0200-4739-9a0d-500a036efb97" xlink:to="loc_lthm_NemaskaLithiumMember_a2bfd630-1c36-443a-bcb6-0816ec983a12" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_3cd5f2b8-d686-4793-8be3-218b6ad07b19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_3cd5f2b8-d686-4793-8be3-218b6ad07b19" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7af740c7-416b-4547-b70b-ab2feaa98c34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7af740c7-416b-4547-b70b-ab2feaa98c34" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_b5cbf30c-847e-4a1c-993e-78ad59e0d9ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_b5cbf30c-847e-4a1c-993e-78ad59e0d9ca" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_5b616d01-daf8-4a1c-8441-60a74615e1d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_5b616d01-daf8-4a1c-8441-60a74615e1d4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_fc14d281-7c09-4b06-8cc7-f07cbf717b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_fc14d281-7c09-4b06-8cc7-f07cbf717b0f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fd47263b-574d-4c56-9d59-f9f1de37f2fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_d62cdee1-6af4-4d9b-ad6b-a8a20ddef98b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fd47263b-574d-4c56-9d59-f9f1de37f2fe" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_9c674120-d206-4f5e-ab6d-a418632c11be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_9c674120-d206-4f5e-ab6d-a418632c11be" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_7b3c611a-d0ee-4e63-a911-3636dcf6050f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:to="loc_us-gaap_RepaymentsOfDebt_7b3c611a-d0ee-4e63-a911-3636dcf6050f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfUnsecuredDebt_d92de4b5-da54-45eb-af82-d4d198c0c681" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfUnsecuredDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:to="loc_us-gaap_RepaymentsOfUnsecuredDebt_d92de4b5-da54-45eb-af82-d4d198c0c681" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_efc45fbb-6aae-4763-b8e6-a8f04c7d1806" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ed4ea33d-8716-4685-a3b8-30d04d1b40bd" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_efc45fbb-6aae-4763-b8e6-a8f04c7d1806" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6d0e3d7b-1aa9-476b-9b71-dd5c4e4f59aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6d0e3d7b-1aa9-476b-9b71-dd5c4e4f59aa" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_302511d4-3947-4fe2-86e2-16f2262454db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_302511d4-3947-4fe2-86e2-16f2262454db" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_fcd680c4-9c4b-4b40-93ae-f609e4721c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_fcd680c4-9c4b-4b40-93ae-f609e4721c0f" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_ec6599de-e245-4376-a058-f186ac504186" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions_5f2a71f4-b523-4b63-bdab-5fa66f4a6d66" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeNumberOfSharesIssuedForAllTransactions_5f2a71f4-b523-4b63-bdab-5fa66f4a6d66" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions_3cbefe28-9425-44ba-91bc-f91cebff4299" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7e579fdd-4133-48a8-8b33-fb327bf031d7" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativeProceedsReceivedOnAllTransactions_3cbefe28-9425-44ba-91bc-f91cebff4299" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_e3c05a66-fe8e-44d9-8a17-bfd2bbce398e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/PropertyPlantandEquipmentNetDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#PropertyPlantandEquipmentNetDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/PropertyPlantandEquipmentNetDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2f67d297-8829-40ea-a5b0-ed9ca04d009b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c2988d70-656c-4e91-a87a-61249b3b703d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2f67d297-8829-40ea-a5b0-ed9ca04d009b" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c2988d70-656c-4e91-a87a-61249b3b703d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_048de590-da4b-4927-b235-31810c694c20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c2988d70-656c-4e91-a87a-61249b3b703d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_048de590-da4b-4927-b235-31810c694c20" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_048de590-da4b-4927-b235-31810c694c20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_048de590-da4b-4927-b235-31810c694c20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_048de590-da4b-4927-b235-31810c694c20_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_048de590-da4b-4927-b235-31810c694c20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndLandImprovementsMember_5f6b99b3-ad60-46df-81d8-e89c59685f97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandAndLandImprovementsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:to="loc_us-gaap_LandAndLandImprovementsMember_5f6b99b3-ad60-46df-81d8-e89c59685f97" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_d2154df6-01d6-4997-8ba1-2e56ecdca526" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:to="loc_us-gaap_BuildingMember_d2154df6-01d6-4997-8ba1-2e56ecdca526" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_97aaf71b-58f0-412d-97da-648d13d9ec5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_97aaf71b-58f0-412d-97da-648d13d9ec5d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_MineralRightsMember_9f045241-44b7-458d-95f9-dd2d2b5d47f6" xlink:href="lthm-20231231.xsd#lthm_MineralRightsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:to="loc_lthm_MineralRightsMember_9f045241-44b7-458d-95f9-dd2d2b5d47f6" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_f830952a-13d2-49d0-83aa-afffcf19debc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConstructionInProgressMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4446450e-f156-4651-80d6-4fca069e91c8" xlink:to="loc_us-gaap_ConstructionInProgressMember_f830952a-13d2-49d0-83aa-afffcf19debc" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_1c7b5e79-6f77-40a5-a682-d8ab273d9443" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2f67d297-8829-40ea-a5b0-ed9ca04d009b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_1c7b5e79-6f77-40a5-a682-d8ab273d9443" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ef0211d9-a7df-4c74-b063-b0f98fd1972b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2f67d297-8829-40ea-a5b0-ed9ca04d009b" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ef0211d9-a7df-4c74-b063-b0f98fd1972b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_980b2859-89e0-4f42-8279-52b93238c31f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2f67d297-8829-40ea-a5b0-ed9ca04d009b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_980b2859-89e0-4f42-8279-52b93238c31f" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/RestructuringandOtherChargesRestructuringChargesinConsolidatedIncomeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#RestructuringandOtherChargesRestructuringChargesinConsolidatedIncomeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/RestructuringandOtherChargesRestructuringChargesinConsolidatedIncomeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5992c077-cacf-4c05-b9fa-f136d3f517eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5992c077-cacf-4c05-b9fa-f136d3f517eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_ce678add-38ee-4d3b-a0f8-52b392930785" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5992c077-cacf-4c05-b9fa-f136d3f517eb" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_ce678add-38ee-4d3b-a0f8-52b392930785" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_ce678add-38ee-4d3b-a0f8-52b392930785_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ce678add-38ee-4d3b-a0f8-52b392930785" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_ce678add-38ee-4d3b-a0f8-52b392930785_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_4cd08534-908c-4d0d-8067-f0a87fc19251" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ce678add-38ee-4d3b-a0f8-52b392930785" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_4cd08534-908c-4d0d-8067-f0a87fc19251" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_8916fcc0-2f79-4dfa-853d-c1324c3ba5a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FacilityClosingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_4cd08534-908c-4d0d-8067-f0a87fc19251" xlink:to="loc_us-gaap_FacilityClosingMember_8916fcc0-2f79-4dfa-853d-c1324c3ba5a1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemAxis_eb75a9bf-1556-42b5-bc2c-08db153dcd0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnusualOrInfrequentItemAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5992c077-cacf-4c05-b9fa-f136d3f517eb" xlink:to="loc_us-gaap_UnusualOrInfrequentItemAxis_eb75a9bf-1556-42b5-bc2c-08db153dcd0e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemDomain_eb75a9bf-1556-42b5-bc2c-08db153dcd0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnusualOrInfrequentItemDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnusualOrInfrequentItemAxis_eb75a9bf-1556-42b5-bc2c-08db153dcd0e" xlink:to="loc_us-gaap_UnusualOrInfrequentItemDomain_eb75a9bf-1556-42b5-bc2c-08db153dcd0e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusualOrInfrequentItemDomain_cebe1695-9c90-4f24-8817-5728b6423f28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnusualOrInfrequentItemDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnusualOrInfrequentItemAxis_eb75a9bf-1556-42b5-bc2c-08db153dcd0e" xlink:to="loc_us-gaap_UnusualOrInfrequentItemDomain_cebe1695-9c90-4f24-8817-5728b6423f28" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BessemerCityPlantFireMember_e836a830-446c-4b7d-87da-6a82b96dc100" xlink:href="lthm-20231231.xsd#lthm_BessemerCityPlantFireMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnusualOrInfrequentItemDomain_cebe1695-9c90-4f24-8817-5728b6423f28" xlink:to="loc_lthm_BessemerCityPlantFireMember_e836a830-446c-4b7d-87da-6a82b96dc100" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAbstract_0105a7a2-c81f-4999-98d5-106160a5da36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_us-gaap_RestructuringCostsAbstract_0105a7a2-c81f-4999-98d5-106160a5da36" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_7e5ae0eb-a771-4af2-ba24-7c78641bea18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostsAbstract_0105a7a2-c81f-4999-98d5-106160a5da36" xlink:to="loc_us-gaap_RestructuringCharges_7e5ae0eb-a771-4af2-ba24-7c78641bea18" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpensesAbstract_184d8876-f600-468f-87d2-3438c59dd37e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherExpensesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_us-gaap_OtherExpensesAbstract_184d8876-f600-468f-87d2-3438c59dd37e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_4bbe0c2f-8be7-45ad-84f4-25498efc8b22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_184d8876-f600-468f-87d2-3438c59dd37e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_4bbe0c2f-8be7-45ad-84f4-25498efc8b22" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_7b5728d6-8b41-482d-ad65-c3e27b2c0229" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_184d8876-f600-468f-87d2-3438c59dd37e" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_7b5728d6-8b41-482d-ad65-c3e27b2c0229" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonrecurringExpense_2ae0fbde-8c47-4e90-b41a-0ca9b7826d32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonrecurringExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherExpensesAbstract_184d8876-f600-468f-87d2-3438c59dd37e" xlink:to="loc_us-gaap_OtherNonrecurringExpense_2ae0fbde-8c47-4e90-b41a-0ca9b7826d32" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_RestructuringSettlementAndImpairmentProvisionsAndOtherNonrecurringExpense_ebf4333d-bc5c-447a-b470-04a9997db338" xlink:href="lthm-20231231.xsd#lthm_RestructuringSettlementAndImpairmentProvisionsAndOtherNonrecurringExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_lthm_RestructuringSettlementAndImpairmentProvisionsAndOtherNonrecurringExpense_ebf4333d-bc5c-447a-b470-04a9997db338" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfLand_4ed465b0-3508-4444-94cb-fae1f65ed609" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AreaOfLand"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_us-gaap_AreaOfLand_4ed465b0-3508-4444-94cb-fae1f65ed609" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_ae3ce5b8-38b0-4ff8-b299-82ea36068317" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetImpairmentCharges"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_18365187-4079-4768-93a4-28e8f3cf9c2f" xlink:to="loc_us-gaap_AssetImpairmentCharges_ae3ce5b8-38b0-4ff8-b299-82ea36068317" xlink:type="arc" order="4"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#IncomeTaxesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_d8a07314-4812-4a5d-a93e-ebb840b08b9c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:to="loc_srt_StatementGeographicalAxis_d8a07314-4812-4a5d-a93e-ebb840b08b9c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d8a07314-4812-4a5d-a93e-ebb840b08b9c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_d8a07314-4812-4a5d-a93e-ebb840b08b9c" xlink:to="loc_srt_SegmentGeographicalDomain_d8a07314-4812-4a5d-a93e-ebb840b08b9c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_2aafd542-2120-4a6d-b2fb-e8009fd45bc5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_d8a07314-4812-4a5d-a93e-ebb840b08b9c" xlink:to="loc_srt_SegmentGeographicalDomain_2aafd542-2120-4a6d-b2fb-e8009fd45bc5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_country_AR_edc1f025-2bf8-4863-9b8e-89aa6ad6fdec" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_AR"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2aafd542-2120-4a6d-b2fb-e8009fd45bc5" xlink:to="loc_country_AR_edc1f025-2bf8-4863-9b8e-89aa6ad6fdec" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_country_CA_5797e2e4-be70-4a45-948f-2ef7a2d65951" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CA"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2aafd542-2120-4a6d-b2fb-e8009fd45bc5" xlink:to="loc_country_CA_5797e2e4-be70-4a45-948f-2ef7a2d65951" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_ef747df1-7b6a-4c93-9530-90dd6a7946b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_ef747df1-7b6a-4c93-9530-90dd6a7946b0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_ef747df1-7b6a-4c93-9530-90dd6a7946b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_ef747df1-7b6a-4c93-9530-90dd6a7946b0" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_ef747df1-7b6a-4c93-9530-90dd6a7946b0_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_7006a3f2-016d-4ea1-bdd0-44a4502e093b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_ef747df1-7b6a-4c93-9530-90dd6a7946b0" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_7006a3f2-016d-4ea1-bdd0-44a4502e093b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TMAAgreementIndemnificationAssetMember_3c221831-4ba5-4bec-aa40-696822bd4758" xlink:href="lthm-20231231.xsd#lthm_TMAAgreementIndemnificationAssetMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_7006a3f2-016d-4ea1-bdd0-44a4502e093b" xlink:to="loc_lthm_TMAAgreementIndemnificationAssetMember_3c221831-4ba5-4bec-aa40-696822bd4758" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_778b9084-3b39-472c-ac8c-a824fc979051" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:to="loc_srt_RangeAxis_778b9084-3b39-472c-ac8c-a824fc979051" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_778b9084-3b39-472c-ac8c-a824fc979051_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_778b9084-3b39-472c-ac8c-a824fc979051" xlink:to="loc_srt_RangeMember_778b9084-3b39-472c-ac8c-a824fc979051_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01e36f72-905e-4e2f-a077-0a89740c86db" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_778b9084-3b39-472c-ac8c-a824fc979051" xlink:to="loc_srt_RangeMember_01e36f72-905e-4e2f-a077-0a89740c86db" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bf502c2b-0214-4889-acb7-5b4b3a3cced0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01e36f72-905e-4e2f-a077-0a89740c86db" xlink:to="loc_srt_MinimumMember_bf502c2b-0214-4889-acb7-5b4b3a3cced0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_35ff56a5-5cb2-4ee7-b21e-b12a9132d651" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01e36f72-905e-4e2f-a077-0a89740c86db" xlink:to="loc_srt_MaximumMember_35ff56a5-5cb2-4ee7-b21e-b12a9132d651" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_c36bd6ee-94fc-4760-9cac-640c3eb471d6" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_db89564a-3b92-4c5d-89c6-62b6ac6c854a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_7d8c41e4-da5b-4fe7-8cd6-6807b249fb8f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_db89564a-3b92-4c5d-89c6-62b6ac6c854a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_f2d273c1-6543-4ddf-995c-e1f8f4ec67f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_db89564a-3b92-4c5d-89c6-62b6ac6c854a" xlink:to="loc_us-gaap_ForeignCountryMember_f2d273c1-6543-4ddf-995c-e1f8f4ec67f0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_700456cb-ccb6-4c6d-8fc3-80b405066939" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_700456cb-ccb6-4c6d-8fc3-80b405066939" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_9f454bf2-261a-4d24-b3fe-80ea6def5d86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwards"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_OperatingLossCarryforwards_9f454bf2-261a-4d24-b3fe-80ea6def5d86" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_OperatingLossCarryforwardsExpiringPeriod_71fe38fb-b5e8-46f7-9cf9-4531f5fd9baa" xlink:href="lthm-20231231.xsd#lthm_OperatingLossCarryforwardsExpiringPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_lthm_OperatingLossCarryforwardsExpiringPeriod_71fe38fb-b5e8-46f7-9cf9-4531f5fd9baa" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_443af6e0-17b2-4952-9d22-3926ee3643b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherReceivables"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_OtherReceivables_443af6e0-17b2-4952-9d22-3926ee3643b2" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NumberOfSignificantForeignJurisdictions_0f1295c3-4020-42e5-b8c9-b10b74fb0e45" xlink:href="lthm-20231231.xsd#lthm_NumberOfSignificantForeignJurisdictions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_lthm_NumberOfSignificantForeignJurisdictions_0f1295c3-4020-42e5-b8c9-b10b74fb0e45" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_55ddcbcd-33c0-4981-9b6a-83d4d4d77700" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_55ddcbcd-33c0-4981-9b6a-83d4d4d77700" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_25884a6d-4278-42ca-adde-98b78820081d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_25884a6d-4278-42ca-adde-98b78820081d" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_158cef7a-722f-48f7-9313-25cdd493e942" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_158cef7a-722f-48f7-9313-25cdd493e942" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_fcd1103c-596a-4152-903d-fbcda818d287" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_fcd1103c-596a-4152-903d-fbcda818d287" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_90ecc6cf-a986-4302-a4ac-6ec9eb35f2d1" xlink:to="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_4b5fa3c2-c526-4dfc-98f9-805e972330e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefits"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_4b5fa3c2-c526-4dfc-98f9-805e972330e2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_4d6574fa-5422-4e40-ae86-afd14bec55de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_4d6574fa-5422-4e40-ae86-afd14bec55de" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_758464b5-13cb-4938-a63a-4fe32c2a1def" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_758464b5-13cb-4938-a63a-4fe32c2a1def" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_6d8162dc-a576-4776-a0bc-f8f9d9fb94b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_6d8162dc-a576-4776-a0bc-f8f9d9fb94b0" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_24e106ff-916e-4081-941d-1c119289cc9c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_24e106ff-916e-4081-941d-1c119289cc9c" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_a1d4aac0-a035-49ac-ba34-ea6e1fb0e6fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_795d4771-44b4-469d-af3a-5bf36aa4e8ab" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_a1d4aac0-a035-49ac-ba34-ea6e1fb0e6fa" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_b5bd2cf5-599c-4e9c-82b2-dbe1753069f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefits"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/DebtLongtermDebtDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#DebtLongtermDebtDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/DebtLongtermDebtDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_93f26f41-7a7b-4ef2-ba80-44e596fa46c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:to="loc_us-gaap_VariableRateAxis_93f26f41-7a7b-4ef2-ba80-44e596fa46c5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_93f26f41-7a7b-4ef2-ba80-44e596fa46c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_93f26f41-7a7b-4ef2-ba80-44e596fa46c5" xlink:to="loc_us-gaap_VariableRateDomain_93f26f41-7a7b-4ef2-ba80-44e596fa46c5_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_78fabb6c-8b0a-4026-85bc-e3c6a4373552" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_93f26f41-7a7b-4ef2-ba80-44e596fa46c5" xlink:to="loc_us-gaap_VariableRateDomain_78fabb6c-8b0a-4026-85bc-e3c6a4373552" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_SecuredOvernightFinancingRateSOFRMember_22179d02-ac72-4842-98a4-66262db2e172" xlink:href="lthm-20231231.xsd#lthm_SecuredOvernightFinancingRateSOFRMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_78fabb6c-8b0a-4026-85bc-e3c6a4373552" xlink:to="loc_lthm_SecuredOvernightFinancingRateSOFRMember_22179d02-ac72-4842-98a4-66262db2e172" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_a8f413b2-f9e9-4844-8d82-0f9700b83d20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BaseRateMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_78fabb6c-8b0a-4026-85bc-e3c6a4373552" xlink:to="loc_us-gaap_BaseRateMember_a8f413b2-f9e9-4844-8d82-0f9700b83d20" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:to="loc_us-gaap_CreditFacilityAxis_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd" xlink:to="loc_us-gaap_CreditFacilityDomain_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_0d667f8b-a47c-4e2b-9127-b05c009fec5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_71e61d3e-6ff5-4a08-9cb5-3f13d8b046bd" xlink:to="loc_us-gaap_CreditFacilityDomain_0d667f8b-a47c-4e2b-9127-b05c009fec5b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_0676e35d-3677-42a3-9a62-80076dcb5070" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_0d667f8b-a47c-4e2b-9127-b05c009fec5b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_0676e35d-3677-42a3-9a62-80076dcb5070" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f57f9ab1-5acd-4e25-9711-6addb698aae2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f57f9ab1-5acd-4e25-9711-6addb698aae2" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f57f9ab1-5acd-4e25-9711-6addb698aae2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f57f9ab1-5acd-4e25-9711-6addb698aae2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f57f9ab1-5acd-4e25-9711-6addb698aae2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8a18d6d2-c6f5-4eef-9172-6204824638c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f57f9ab1-5acd-4e25-9711-6addb698aae2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_8a18d6d2-c6f5-4eef-9172-6204824638c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_0775aaa7-fa18-4f91-90bc-694743322357" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8a18d6d2-c6f5-4eef-9172-6204824638c6" xlink:to="loc_us-gaap_LineOfCreditMember_0775aaa7-fa18-4f91-90bc-694743322357" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_c4fc344c-ced0-4450-8a22-c9160a6dfe17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8a18d6d2-c6f5-4eef-9172-6204824638c6" xlink:to="loc_us-gaap_ConvertibleDebtMember_c4fc344c-ced0-4450-8a22-c9160a6dfe17" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_e8ba2741-7162-4dff-86a4-92ab156a7ac1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_e8ba2741-7162-4dff-86a4-92ab156a7ac1" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e8ba2741-7162-4dff-86a4-92ab156a7ac1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_e8ba2741-7162-4dff-86a4-92ab156a7ac1" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e8ba2741-7162-4dff-86a4-92ab156a7ac1_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_7c5c9cb2-7edc-48f9-851f-ea4d65117c06" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_e8ba2741-7162-4dff-86a4-92ab156a7ac1" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_7c5c9cb2-7edc-48f9-851f-ea4d65117c06" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NemaskaLithiumMember_03d72545-1722-4a5b-9ba0-52ca4b56dbf9" xlink:href="lthm-20231231.xsd#lthm_NemaskaLithiumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_7c5c9cb2-7edc-48f9-851f-ea4d65117c06" xlink:to="loc_lthm_NemaskaLithiumMember_03d72545-1722-4a5b-9ba0-52ca4b56dbf9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d9ac701e-f8b7-432c-b262-9068fb0bc96b" xlink:to="loc_us-gaap_DebtInstrumentAxis_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_40d7096e-5a32-4859-89ed-b21a9dfd7ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7a71dadd-75a2-49b0-8aaa-53105bcb2ce1" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_40d7096e-5a32-4859-89ed-b21a9dfd7ae8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_PrepaymentAgreementMember_1f76eaf9-33d1-4f31-8772-f1639a641470" xlink:href="lthm-20231231.xsd#lthm_PrepaymentAgreementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_40d7096e-5a32-4859-89ed-b21a9dfd7ae8" xlink:to="loc_lthm_PrepaymentAgreementMember_1f76eaf9-33d1-4f31-8772-f1639a641470" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_OtherMember_815c393d-7f85-4e97-a137-3f3234ac1c95" xlink:href="lthm-20231231.xsd#lthm_OtherMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_40d7096e-5a32-4859-89ed-b21a9dfd7ae8" xlink:to="loc_lthm_OtherMember_815c393d-7f85-4e97-a137-3f3234ac1c95" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_fe5656ca-9a44-4cfd-a785-23d89e7b26c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_fe5656ca-9a44-4cfd-a785-23d89e7b26c8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a8dce234-d8f5-42b6-b41a-61b88f4659e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a8dce234-d8f5-42b6-b41a-61b88f4659e7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_300c4b54-8f61-4454-abfb-447dbc8b6b37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_300c4b54-8f61-4454-abfb-447dbc8b6b37" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_038099e5-48c9-43bc-a016-e7812db5ca5f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_038099e5-48c9-43bc-a016-e7812db5ca5f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_77424179-3c5d-4788-a21d-09f8c9780a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_OtherLongTermDebt_77424179-3c5d-4788-a21d-09f8c9780a9d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_423b77b2-a4dd-4c86-91ad-b8e3797e922a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LongTermDebt_423b77b2-a4dd-4c86-91ad-b8e3797e922a" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_333200c9-298a-4424-855d-3b175635be87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LongTermDebtCurrent_333200c9-298a-4424-855d-3b175635be87" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_a0b5fbdf-5196-44bd-b410-0c4078bfb456" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_a0b5fbdf-5196-44bd-b410-0c4078bfb456" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_71295b26-eedc-492c-a8fd-9a17662c268a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_71295b26-eedc-492c-a8fd-9a17662c268a" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_eb3735da-a57f-4ce1-aceb-6ff44b0f5fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_07efd49c-9f0f-4934-aa8b-7f32d9c0a327" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_eb3735da-a57f-4ce1-aceb-6ff44b0f5fd9" xlink:type="arc" order="9"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#DebtNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/DebtNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_0bbfe41e-9887-4fd7-b915-37266ea315a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_DebtInstrumentAxis_0bbfe41e-9887-4fd7-b915-37266ea315a3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0bbfe41e-9887-4fd7-b915-37266ea315a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_0bbfe41e-9887-4fd7-b915-37266ea315a3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0bbfe41e-9887-4fd7-b915-37266ea315a3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_aa4d2035-d3ac-45a0-9c22-ad470bb72048" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_0bbfe41e-9887-4fd7-b915-37266ea315a3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_aa4d2035-d3ac-45a0-9c22-ad470bb72048" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ConvertibleSeniorNotesDue2025Member_80e3ad80-e4de-4725-98e8-132f77389436" xlink:href="lthm-20231231.xsd#lthm_ConvertibleSeniorNotesDue2025Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_aa4d2035-d3ac-45a0-9c22-ad470bb72048" xlink:to="loc_lthm_ConvertibleSeniorNotesDue2025Member_80e3ad80-e4de-4725-98e8-132f77389436" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ConvertibleSeniorNotesOverAllotmentOptionMember_5e996763-c519-4e76-b9a4-12abdc602066" xlink:href="lthm-20231231.xsd#lthm_ConvertibleSeniorNotesOverAllotmentOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_aa4d2035-d3ac-45a0-9c22-ad470bb72048" xlink:to="loc_lthm_ConvertibleSeniorNotesOverAllotmentOptionMember_5e996763-c519-4e76-b9a4-12abdc602066" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CreditAgreementMember_dfb37fb1-f757-4a06-a93a-4ef16bfd0bc0" xlink:href="lthm-20231231.xsd#lthm_CreditAgreementMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_aa4d2035-d3ac-45a0-9c22-ad470bb72048" xlink:to="loc_lthm_CreditAgreementMember_dfb37fb1-f757-4a06-a93a-4ef16bfd0bc0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e1e9d3fd-815c-4d38-840d-ed2e87a76c86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e1e9d3fd-815c-4d38-840d-ed2e87a76c86" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e1e9d3fd-815c-4d38-840d-ed2e87a76c86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e1e9d3fd-815c-4d38-840d-ed2e87a76c86" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e1e9d3fd-815c-4d38-840d-ed2e87a76c86_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_36c2d1a9-95a1-40f7-8f57-21fa19190aba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e1e9d3fd-815c-4d38-840d-ed2e87a76c86" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_36c2d1a9-95a1-40f7-8f57-21fa19190aba" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_2a4d5280-138d-46ad-aa98-960099d60734" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_36c2d1a9-95a1-40f7-8f57-21fa19190aba" xlink:to="loc_us-gaap_ConvertibleDebtMember_2a4d5280-138d-46ad-aa98-960099d60734" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_0144b106-3d85-4f01-90c6-2d86ae33f8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_36c2d1a9-95a1-40f7-8f57-21fa19190aba" xlink:to="loc_us-gaap_LineOfCreditMember_0144b106-3d85-4f01-90c6-2d86ae33f8ea" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_7598a1b5-f900-49c1-bb61-c94d7a949002" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_CreditFacilityAxis_7598a1b5-f900-49c1-bb61-c94d7a949002" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7598a1b5-f900-49c1-bb61-c94d7a949002_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_7598a1b5-f900-49c1-bb61-c94d7a949002" xlink:to="loc_us-gaap_CreditFacilityDomain_7598a1b5-f900-49c1-bb61-c94d7a949002_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_cdc457e5-4a4e-4ee7-be58-e5296c8db97b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_7598a1b5-f900-49c1-bb61-c94d7a949002" xlink:to="loc_us-gaap_CreditFacilityDomain_cdc457e5-4a4e-4ee7-be58-e5296c8db97b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a2778f52-993a-4a73-b925-ffd190d97ab1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cdc457e5-4a4e-4ee7-be58-e5296c8db97b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a2778f52-993a-4a73-b925-ffd190d97ab1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_5336f50a-a61f-4386-b6d3-ce0d9a456179" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LetterOfCreditMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cdc457e5-4a4e-4ee7-be58-e5296c8db97b" xlink:to="loc_us-gaap_LetterOfCreditMember_5336f50a-a61f-4386-b6d3-ce0d9a456179" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_e6a779e3-c2a5-4f40-975e-267342915adc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_VariableRateAxis_e6a779e3-c2a5-4f40-975e-267342915adc" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_e6a779e3-c2a5-4f40-975e-267342915adc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_e6a779e3-c2a5-4f40-975e-267342915adc" xlink:to="loc_us-gaap_VariableRateDomain_e6a779e3-c2a5-4f40-975e-267342915adc_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d4f64fe8-1f6f-4dc1-bdd8-308246e8e501" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_e6a779e3-c2a5-4f40-975e-267342915adc" xlink:to="loc_us-gaap_VariableRateDomain_d4f64fe8-1f6f-4dc1-bdd8-308246e8e501" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_SecuredOvernightFinancingRateSOFRMember_8c0158c4-066f-485a-b819-04868da81cc0" xlink:href="lthm-20231231.xsd#lthm_SecuredOvernightFinancingRateSOFRMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d4f64fe8-1f6f-4dc1-bdd8-308246e8e501" xlink:to="loc_lthm_SecuredOvernightFinancingRateSOFRMember_8c0158c4-066f-485a-b819-04868da81cc0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_5f3a2591-831a-465f-8c35-776c612ad392" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_5f3a2591-831a-465f-8c35-776c612ad392" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_5f3a2591-831a-465f-8c35-776c612ad392_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5f3a2591-831a-465f-8c35-776c612ad392" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_5f3a2591-831a-465f-8c35-776c612ad392_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c6040573-9c6e-4d2d-ad0e-1c53068c4272" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5f3a2591-831a-465f-8c35-776c612ad392" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c6040573-9c6e-4d2d-ad0e-1c53068c4272" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_c948c347-681e-47d7-828d-4fd7200605f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c6040573-9c6e-4d2d-ad0e-1c53068c4272" xlink:to="loc_us-gaap_SubsequentEventMember_c948c347-681e-47d7-828d-4fd7200605f7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_5fe4dd22-4623-40b2-92ab-e4e963b27d02" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_srt_StatementScenarioAxis_5fe4dd22-4623-40b2-92ab-e4e963b27d02" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5fe4dd22-4623-40b2-92ab-e4e963b27d02_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_5fe4dd22-4623-40b2-92ab-e4e963b27d02" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5fe4dd22-4623-40b2-92ab-e4e963b27d02_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_a2c8e221-74c8-404e-9946-c22eb6467cdb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_5fe4dd22-4623-40b2-92ab-e4e963b27d02" xlink:to="loc_srt_ScenarioUnspecifiedDomain_a2c8e221-74c8-404e-9946-c22eb6467cdb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_e6384aaf-267b-4971-83ca-aac5282b7339" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_a2c8e221-74c8-404e-9946-c22eb6467cdb" xlink:to="loc_srt_ScenarioForecastMember_e6384aaf-267b-4971-83ca-aac5282b7339" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_89dee8ab-4483-42b5-9541-9a2489fe2070" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtConversionByUniqueDescriptionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7d29a497-85f7-42c6-8d52-3bb28962e7b2" xlink:to="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_89dee8ab-4483-42b5-9541-9a2489fe2070" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtConversionNameDomain_89dee8ab-4483-42b5-9541-9a2489fe2070_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtConversionNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_89dee8ab-4483-42b5-9541-9a2489fe2070" xlink:to="loc_us-gaap_DebtConversionNameDomain_89dee8ab-4483-42b5-9541-9a2489fe2070_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtConversionNameDomain_41517fa5-94de-4fc4-9aa0-b3c8ecbca318" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtConversionNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtConversionByUniqueDescriptionAxis_89dee8ab-4483-42b5-9541-9a2489fe2070" xlink:to="loc_us-gaap_DebtConversionNameDomain_41517fa5-94de-4fc4-9aa0-b3c8ecbca318" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ConversionCircumstanceOneMember_637b3581-536f-4d1a-ad76-0947d86dfa28" xlink:href="lthm-20231231.xsd#lthm_ConversionCircumstanceOneMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtConversionNameDomain_41517fa5-94de-4fc4-9aa0-b3c8ecbca318" xlink:to="loc_lthm_ConversionCircumstanceOneMember_637b3581-536f-4d1a-ad76-0947d86dfa28" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_75e9e78e-9e94-4f4d-95ce-da555f7fa7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_75e9e78e-9e94-4f4d-95ce-da555f7fa7d7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1cacd866-27be-44b2-9933-2d51f92f0121" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1cacd866-27be-44b2-9933-2d51f92f0121" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_ec4697d9-1d5c-48e5-9dc9-60e8f922a5ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_ec4697d9-1d5c-48e5-9dc9-60e8f922a5ad" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_ae92ffd9-b89c-4f9f-b148-8aa0d0caf73f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_ae92ffd9-b89c-4f9f-b148-8aa0d0caf73f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_ef6c9f1b-1859-485c-b8c6-766d148d9460" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtConversionConvertedInstrumentSharesIssued1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_ef6c9f1b-1859-485c-b8c6-766d148d9460" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_6cdc44d4-c521-403c-ba88-2b76fb601ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_6cdc44d4-c521-403c-ba88-2b76fb601ccd" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_9fd2788a-edd8-4cb7-b1b4-bf3b6f402066" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_9fd2788a-edd8-4cb7-b1b4-bf3b6f402066" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_60251f17-3c53-41b6-9168-07807bc3eb12" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_60251f17-3c53-41b6-9168-07807bc3eb12" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_5a110c03-56d4-44d7-a9b4-3e29e132529a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_5a110c03-56d4-44d7-a9b4-3e29e132529a" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9d90b63e-c013-4228-9a25-15a97693b2ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_9d90b63e-c013-4228-9a25-15a97693b2ac" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentConvertibleNumberOfConsecutiveBusinessDaysFollowingConsecutiveTradingDayPeriod_ed22210f-620b-4fa5-88b9-855c593c244d" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentConvertibleNumberOfConsecutiveBusinessDaysFollowingConsecutiveTradingDayPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentConvertibleNumberOfConsecutiveBusinessDaysFollowingConsecutiveTradingDayPeriod_ed22210f-620b-4fa5-88b9-855c593c244d" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentConvertiblePeriodOfConsecutiveTradingDays_06fd9887-8cc2-465f-9140-3b1adbe40a4d" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentConvertiblePeriodOfConsecutiveTradingDays"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentConvertiblePeriodOfConsecutiveTradingDays_06fd9887-8cc2-465f-9140-3b1adbe40a4d" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentConvertibleTradingPriceAsPercentageOfClosingPriceOfCommonStock_982c79e6-887e-4712-84b1-5447146ad4d5" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentConvertibleTradingPriceAsPercentageOfClosingPriceOfCommonStock"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentConvertibleTradingPriceAsPercentageOfClosingPriceOfCommonStock_982c79e6-887e-4712-84b1-5447146ad4d5" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_533cdcc8-daef-492e-a6c2-2b23f3db0af8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_533cdcc8-daef-492e-a6c2-2b23f3db0af8" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_9ecf7758-de86-4926-a5f1-fcd60fb2e679" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_9ecf7758-de86-4926-a5f1-fcd60fb2e679" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9e4622ad-c832-4ea1-afc7-81e43126fbba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9e4622ad-c832-4ea1-afc7-81e43126fbba" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_LineOfCreditFacilityAccordionFeatureIncreaseLimit_97e2e132-89f7-40f0-9c4a-3187909ef46e" xlink:href="lthm-20231231.xsd#lthm_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_LineOfCreditFacilityAccordionFeatureIncreaseLimit_97e2e132-89f7-40f0-9c4a-3187909ef46e" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a9a52cc3-6f56-4a97-924f-b9a48ac8db2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a9a52cc3-6f56-4a97-924f-b9a48ac8db2c" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentFloorRate_3d8a666f-2667-4f8c-b6a6-3e3ee8a05452" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentFloorRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentFloorRate_3d8a666f-2667-4f8c-b6a6-3e3ee8a05452" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_3af21d6c-a2db-469a-aad5-2232a23bdbdc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_3af21d6c-a2db-469a-aad5-2232a23bdbdc" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_01e71454-a413-4bb4-aa25-997a9461a9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_01e71454-a413-4bb4-aa25-997a9461a9b8" xlink:type="arc" order="20"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_9742d800-77fb-4aa8-8a38-5b1adf22f8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_9742d800-77fb-4aa8-8a38-5b1adf22f8d3" xlink:type="arc" order="21"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_e9f7b0ba-80e1-4bc0-b3a3-f3affdd76137" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_e9f7b0ba-80e1-4bc0-b3a3-f3affdd76137" xlink:type="arc" order="22"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentCovenantMaximumNetLeverageRatio_b2bcfd64-8176-448d-8f79-18d9d8a133cc" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentCovenantMaximumNetLeverageRatio"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentCovenantMaximumNetLeverageRatio_b2bcfd64-8176-448d-8f79-18d9d8a133cc" xlink:type="arc" order="23"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_DebtInstrumentCovenantMinimumInterestCoverageRatio_b9625c8a-098b-48b5-950e-b5df92e57d63" xlink:href="lthm-20231231.xsd#lthm_DebtInstrumentCovenantMinimumInterestCoverageRatio"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fda25a25-0e18-4911-82b1-e527985940ea" xlink:to="loc_lthm_DebtInstrumentCovenantMinimumInterestCoverageRatio_b9625c8a-098b-48b5-950e-b5df92e57d63" xlink:type="arc" order="24"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/StockbasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#StockbasedCompensationNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/StockbasedCompensationNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_513545fd-7f20-4726-97c6-c94cda7f20ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_513545fd-7f20-4726-97c6-c94cda7f20ff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_43b51e00-c01a-4cad-bd34-a275a87a4d23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_513545fd-7f20-4726-97c6-c94cda7f20ff" xlink:to="loc_us-gaap_PlanNameAxis_43b51e00-c01a-4cad-bd34-a275a87a4d23" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_43b51e00-c01a-4cad-bd34-a275a87a4d23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_43b51e00-c01a-4cad-bd34-a275a87a4d23" xlink:to="loc_us-gaap_PlanNameDomain_43b51e00-c01a-4cad-bd34-a275a87a4d23_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_1035c833-95cb-4741-98c2-dc77dc84c671" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_43b51e00-c01a-4cad-bd34-a275a87a4d23" xlink:to="loc_us-gaap_PlanNameDomain_1035c833-95cb-4741-98c2-dc77dc84c671" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_LiventCorporationIncentiveCompensationAndStockPlanMember_2fc71390-3e0e-4534-a4ac-49e4aeca6d3c" xlink:href="lthm-20231231.xsd#lthm_LiventCorporationIncentiveCompensationAndStockPlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_1035c833-95cb-4741-98c2-dc77dc84c671" xlink:to="loc_lthm_LiventCorporationIncentiveCompensationAndStockPlanMember_2fc71390-3e0e-4534-a4ac-49e4aeca6d3c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_d08cc253-55a3-42db-915c-3237a3c3694b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_513545fd-7f20-4726-97c6-c94cda7f20ff" xlink:to="loc_us-gaap_AwardTypeAxis_d08cc253-55a3-42db-915c-3237a3c3694b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d08cc253-55a3-42db-915c-3237a3c3694b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_d08cc253-55a3-42db-915c-3237a3c3694b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d08cc253-55a3-42db-915c-3237a3c3694b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b181610d-78fb-4460-ac4a-9328befe5012" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_d08cc253-55a3-42db-915c-3237a3c3694b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b181610d-78fb-4460-ac4a-9328befe5012" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_34345c80-0afb-4ac6-adb2-5d556fffafd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b181610d-78fb-4460-ac4a-9328befe5012" xlink:to="loc_us-gaap_EmployeeStockOptionMember_34345c80-0afb-4ac6-adb2-5d556fffafd1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_9e4c0bfc-a0e4-4814-b7da-80cc3544d71d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b181610d-78fb-4460-ac4a-9328befe5012" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_9e4c0bfc-a0e4-4814-b7da-80cc3544d71d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_6a7a104d-3d65-4c5e-8a86-310f808bd302" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b181610d-78fb-4460-ac4a-9328befe5012" xlink:to="loc_us-gaap_PerformanceSharesMember_6a7a104d-3d65-4c5e-8a86-310f808bd302" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_faaeeecd-f842-4362-a736-0449aea6b75c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_513545fd-7f20-4726-97c6-c94cda7f20ff" xlink:to="loc_srt_RangeAxis_faaeeecd-f842-4362-a736-0449aea6b75c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_faaeeecd-f842-4362-a736-0449aea6b75c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_faaeeecd-f842-4362-a736-0449aea6b75c" xlink:to="loc_srt_RangeMember_faaeeecd-f842-4362-a736-0449aea6b75c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_963f75d6-e4d7-4d13-a431-b2c5df7fac88" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_faaeeecd-f842-4362-a736-0449aea6b75c" xlink:to="loc_srt_RangeMember_963f75d6-e4d7-4d13-a431-b2c5df7fac88" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f3f1311d-7d7e-4c09-a022-12e07a0e4633" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_963f75d6-e4d7-4d13-a431-b2c5df7fac88" xlink:to="loc_srt_MinimumMember_f3f1311d-7d7e-4c09-a022-12e07a0e4633" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4556dec9-4e82-4ae0-bbb9-a939ac1e6f59" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_963f75d6-e4d7-4d13-a431-b2c5df7fac88" xlink:to="loc_srt_MaximumMember_4556dec9-4e82-4ae0-bbb9-a939ac1e6f59" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_689fbdad-dbe6-4bb1-819e-5741fe693af4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_689fbdad-dbe6-4bb1-819e-5741fe693af4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_46098729-86d9-431f-9834-13aab4663fd6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_46098729-86d9-431f-9834-13aab4663fd6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_NumberOfPubliclyTradedPeersInSpecialtyChemicalSector_43ecfe90-d8f4-41ec-8e8a-5d6442db7537" xlink:href="lthm-20231231.xsd#lthm_NumberOfPubliclyTradedPeersInSpecialtyChemicalSector"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_lthm_NumberOfPubliclyTradedPeersInSpecialtyChemicalSector_43ecfe90-d8f4-41ec-8e8a-5d6442db7537" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2db4e5f3-c347-4ce9-b508-4f40ecffc16b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2db4e5f3-c347-4ce9-b508-4f40ecffc16b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_ddb8b4ce-e110-4946-adb6-28e8c0709d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_ddb8b4ce-e110-4946-adb6-28e8c0709d5b" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_d1595e19-18b5-4c19-8301-ad509a546491" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_d1595e19-18b5-4c19-8301-ad509a546491" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_0fd18d76-e84c-441c-ad5a-e90601259a91" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_0fd18d76-e84c-441c-ad5a-e90601259a91" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_c444168d-8998-44f0-94d3-90d9016ae7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_c444168d-8998-44f0-94d3-90d9016ae7f9" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ed5e8c6d-9bd5-4b27-8257-7c7bee2a0ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ed5e8c6d-9bd5-4b27-8257-7c7bee2a0ea2" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_e1046730-f076-4c9a-bd2a-6fcf9c074f14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_e1046730-f076-4c9a-bd2a-6fcf9c074f14" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_91f5a620-937d-4b32-9aae-88549e6ca10e" xlink:href="lthm-20231231.xsd#lthm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_lthm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_91f5a620-937d-4b32-9aae-88549e6ca10e" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_2c61002e-c970-47f3-893d-bacf47e0858c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_2c61002e-c970-47f3-893d-bacf47e0858c" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_280a9779-9138-4667-b263-1432f439dabe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_701d314a-a2f9-4eda-a29f-b841f0973239" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_280a9779-9138-4667-b263-1432f439dabe" xlink:type="arc" order="12"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/StockbasedCompensationStockCompensationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#StockbasedCompensationStockCompensationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/StockbasedCompensationStockCompensationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_109146fb-1de9-49e4-bee2-1f2c5e95e0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eb3fb5d4-9c8b-4867-8749-e3313dd3f946" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_109146fb-1de9-49e4-bee2-1f2c5e95e0e5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eb3fb5d4-9c8b-4867-8749-e3313dd3f946" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_3ca05631-4d64-4658-9356-1b5e4b0997f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eb3fb5d4-9c8b-4867-8749-e3313dd3f946" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_3ca05631-4d64-4658-9356-1b5e4b0997f9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3ca05631-4d64-4658-9356-1b5e4b0997f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3ca05631-4d64-4658-9356-1b5e4b0997f9" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3ca05631-4d64-4658-9356-1b5e4b0997f9_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_84d20a98-8a44-4e21-ac06-ae367c0e0f29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_3ca05631-4d64-4658-9356-1b5e4b0997f9" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_84d20a98-8a44-4e21-ac06-ae367c0e0f29" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_c225b0a4-fe9e-4cbc-bd4d-62dc79ec4def" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84d20a98-8a44-4e21-ac06-ae367c0e0f29" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_c225b0a4-fe9e-4cbc-bd4d-62dc79ec4def" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringChargesMember_48f5d5e6-af22-499b-b046-dd755c5bb5ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringChargesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84d20a98-8a44-4e21-ac06-ae367c0e0f29" xlink:to="loc_us-gaap_RestructuringChargesMember_48f5d5e6-af22-499b-b046-dd755c5bb5ce" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eb3fb5d4-9c8b-4867-8749-e3313dd3f946" xlink:to="loc_us-gaap_AwardTypeAxis_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_55300f98-d8aa-4b95-82af-c36c13217911" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_cc3d5c4a-b436-4b2b-8331-85cedf4c4a18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_55300f98-d8aa-4b95-82af-c36c13217911" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_afc72d24-ce23-4019-b86c-242777ed1d2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_55300f98-d8aa-4b95-82af-c36c13217911" xlink:to="loc_us-gaap_EmployeeStockOptionMember_afc72d24-ce23-4019-b86c-242777ed1d2b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_3d0306c0-c0d3-4534-9f3b-21d2a8f877ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_55300f98-d8aa-4b95-82af-c36c13217911" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_3d0306c0-c0d3-4534-9f3b-21d2a8f877ac" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_f403844c-58c8-4fcf-86a0-d24466cfb086" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_55300f98-d8aa-4b95-82af-c36c13217911" xlink:to="loc_us-gaap_PerformanceSharesMember_f403844c-58c8-4fcf-86a0-d24466cfb086" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_d4b7b02d-f3ec-4448-b9bc-3ecbb7802be3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_109146fb-1de9-49e4-bee2-1f2c5e95e0e5" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_d4b7b02d-f3ec-4448-b9bc-3ecbb7802be3" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_6a464132-edee-4549-9520-c819ffafb479" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_109146fb-1de9-49e4-bee2-1f2c5e95e0e5" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_6a464132-edee-4549-9520-c819ffafb479" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2e284c1e-477e-4f97-b140-3809a9f39f5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_109146fb-1de9-49e4-bee2-1f2c5e95e0e5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2e284c1e-477e-4f97-b140-3809a9f39f5a" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/StockbasedCompensationBlackScholesAssumptionsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#StockbasedCompensationBlackScholesAssumptionsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/StockbasedCompensationBlackScholesAssumptionsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6a6879e-38e7-4b38-88c3-48a09d266569" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6a6879e-38e7-4b38-88c3-48a09d266569" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_99bc127f-a9ea-4aa0-9589-0f7851757f05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d6a6879e-38e7-4b38-88c3-48a09d266569" xlink:to="loc_us-gaap_AwardTypeAxis_99bc127f-a9ea-4aa0-9589-0f7851757f05" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99bc127f-a9ea-4aa0-9589-0f7851757f05_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_99bc127f-a9ea-4aa0-9589-0f7851757f05" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_99bc127f-a9ea-4aa0-9589-0f7851757f05_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d781af4-a828-4d60-9104-788ae731a533" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_99bc127f-a9ea-4aa0-9589-0f7851757f05" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d781af4-a828-4d60-9104-788ae731a533" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_ca98f17c-a1ce-408e-9388-c9231feb9363" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d781af4-a828-4d60-9104-788ae731a533" xlink:to="loc_us-gaap_EmployeeStockOptionMember_ca98f17c-a1ce-408e-9388-c9231feb9363" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_6741f362-fa1c-4bae-b902-6be7e5976a28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_6741f362-fa1c-4bae-b902-6be7e5976a28" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_06476c18-a8f6-4698-bf25-99829f77101d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_06476c18-a8f6-4698-bf25-99829f77101d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_5bc4a3be-7843-4abc-b978-aa8fc866f5bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_5bc4a3be-7843-4abc-b978-aa8fc866f5bb" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_d67b4e59-751c-4eab-91d4-77ce494696d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7d33532a-f502-4d2c-952c-d2fa442bb1ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_d67b4e59-751c-4eab-91d4-77ce494696d5" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/StockbasedCompensationStockActivityDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#StockbasedCompensationStockActivityDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/StockbasedCompensationStockActivityDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cdfc1d5c-2371-4918-a91a-d61ba44ca7ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65ceda4c-af15-4c54-8888-912f595838b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cdfc1d5c-2371-4918-a91a-d61ba44ca7ca" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65ceda4c-af15-4c54-8888-912f595838b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e311177c-4674-4a06-9459-701ba5536cee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65ceda4c-af15-4c54-8888-912f595838b2" xlink:to="loc_us-gaap_AwardTypeAxis_e311177c-4674-4a06-9459-701ba5536cee" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e311177c-4674-4a06-9459-701ba5536cee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e311177c-4674-4a06-9459-701ba5536cee" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e311177c-4674-4a06-9459-701ba5536cee_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f259d3ac-5405-4014-a973-6b5ff34b7ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e311177c-4674-4a06-9459-701ba5536cee" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f259d3ac-5405-4014-a973-6b5ff34b7ca3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_b6621ec7-41c1-49e4-8085-90bd1b7872c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f259d3ac-5405-4014-a973-6b5ff34b7ca3" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_b6621ec7-41c1-49e4-8085-90bd1b7872c0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_8cceb12f-e51a-4351-89e1-099c9d7a2d11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f259d3ac-5405-4014-a973-6b5ff34b7ca3" xlink:to="loc_us-gaap_PerformanceSharesMember_8cceb12f-e51a-4351-89e1-099c9d7a2d11" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cdfc1d5c-2371-4918-a91a-d61ba44ca7ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_4d27edca-cd9d-4067-bf30-1560d075e72a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_4d27edca-cd9d-4067-bf30-1560d075e72a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_bf10a96f-a616-4ba5-8069-a152bbc493af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_bf10a96f-a616-4ba5-8069-a152bbc493af" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f67ae982-a512-467a-b919-625d47c8e311" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_f67ae982-a512-467a-b919-625d47c8e311" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_be56130a-8a24-4744-8433-f188fbd2a2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_62ad33b0-7901-4892-bd39-51e58d7faba6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_be56130a-8a24-4744-8433-f188fbd2a2bc" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_20e2eb84-ed6d-4044-9680-83108c6d3558" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cdfc1d5c-2371-4918-a91a-d61ba44ca7ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1b0bb01e-1a25-4980-9140-093a60da011a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1b0bb01e-1a25-4980-9140-093a60da011a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_dba21854-4ed8-4b15-b711-7bb758615e67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_dba21854-4ed8-4b15-b711-7bb758615e67" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_bf008f67-ced8-4bc7-9ab1-2cc96277c590" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_bf008f67-ced8-4bc7-9ab1-2cc96277c590" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f1e8e40e-cfd2-4a9c-a093-e4202ba4b854" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_4a5e137b-83c4-4985-8f94-edb546633ca9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f1e8e40e-cfd2-4a9c-a093-e4202ba4b854" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_189bad4b-bce5-44cb-9340-7797694a86c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_eee192f8-c12c-4d23-85d1-b6c018ee9384" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cdfc1d5c-2371-4918-a91a-d61ba44ca7ca" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_eee192f8-c12c-4d23-85d1-b6c018ee9384" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_12493704-3d3a-49ac-a5e6-b6c5c46ae6fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_eee192f8-c12c-4d23-85d1-b6c018ee9384" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_12493704-3d3a-49ac-a5e6-b6c5c46ae6fd" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/StockbasedCompensationFairValueAssumptionsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#StockbasedCompensationFairValueAssumptionsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/StockbasedCompensationFairValueAssumptionsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_928651de-7e9a-4470-b863-8ae625dd240b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_252bc452-a56e-43e5-a090-89983a7c76f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_928651de-7e9a-4470-b863-8ae625dd240b" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_252bc452-a56e-43e5-a090-89983a7c76f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_cfe68742-e5a4-4b84-897d-d33c04f5a684" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_252bc452-a56e-43e5-a090-89983a7c76f2" xlink:to="loc_us-gaap_AwardTypeAxis_cfe68742-e5a4-4b84-897d-d33c04f5a684" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cfe68742-e5a4-4b84-897d-d33c04f5a684_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_cfe68742-e5a4-4b84-897d-d33c04f5a684" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cfe68742-e5a4-4b84-897d-d33c04f5a684_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9a1abf8-976a-4102-88df-77cce2a8cc61" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_cfe68742-e5a4-4b84-897d-d33c04f5a684" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9a1abf8-976a-4102-88df-77cce2a8cc61" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_51879c8a-090a-4100-8951-4ca664af7118" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f9a1abf8-976a-4102-88df-77cce2a8cc61" xlink:to="loc_us-gaap_PerformanceSharesMember_51879c8a-090a-4100-8951-4ca664af7118" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_788e2918-a701-4376-ba91-0c966cb79ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_928651de-7e9a-4470-b863-8ae625dd240b" xlink:to="loc_us-gaap_SharePrice_788e2918-a701-4376-ba91-0c966cb79ec0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_b3666d4a-1fe6-4e9e-aa7c-4930491bec5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_928651de-7e9a-4470-b863-8ae625dd240b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_b3666d4a-1fe6-4e9e-aa7c-4930491bec5b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_2dd91b5f-cbf9-4bf2-af19-e4bfdc9991f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_928651de-7e9a-4470-b863-8ae625dd240b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_2dd91b5f-cbf9-4bf2-af19-e4bfdc9991f3" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EquitySummaryofCommonStockActivityDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EquitySummaryofCommonStockActivityDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EquitySummaryofCommonStockActivityDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_af54e51c-005a-4921-9bc6-09d679af36a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_b7660f8d-dec1-4ffd-a59f-0f33b443227d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfStockByClassTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_af54e51c-005a-4921-9bc6-09d679af36a4" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_b7660f8d-dec1-4ffd-a59f-0f33b443227d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_c7b4dad6-25b3-419e-ba0e-053c10ca869b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_b7660f8d-dec1-4ffd-a59f-0f33b443227d" xlink:to="loc_us-gaap_PlanNameAxis_c7b4dad6-25b3-419e-ba0e-053c10ca869b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_c7b4dad6-25b3-419e-ba0e-053c10ca869b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_c7b4dad6-25b3-419e-ba0e-053c10ca869b" xlink:to="loc_us-gaap_PlanNameDomain_c7b4dad6-25b3-419e-ba0e-053c10ca869b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_35898a07-63d2-47a5-b948-9ec95a1692fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_c7b4dad6-25b3-419e-ba0e-053c10ca869b" xlink:to="loc_us-gaap_PlanNameDomain_35898a07-63d2-47a5-b948-9ec95a1692fe" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_LiventPlanMember_7f299e97-a80e-441c-8cad-e168aa43a695" xlink:href="lthm-20231231.xsd#lthm_LiventPlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_35898a07-63d2-47a5-b948-9ec95a1692fe" xlink:to="loc_lthm_LiventPlanMember_7f299e97-a80e-441c-8cad-e168aa43a695" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a914d222-5c45-41fe-aadc-df53acee2fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_b7660f8d-dec1-4ffd-a59f-0f33b443227d" xlink:to="loc_us-gaap_AwardTypeAxis_a914d222-5c45-41fe-aadc-df53acee2fa1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a914d222-5c45-41fe-aadc-df53acee2fa1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_a914d222-5c45-41fe-aadc-df53acee2fa1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a914d222-5c45-41fe-aadc-df53acee2fa1_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad36f44a-1ac6-4bc3-8356-40d1c4d12c22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_a914d222-5c45-41fe-aadc-df53acee2fa1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad36f44a-1ac6-4bc3-8356-40d1c4d12c22" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_7c0be54f-7f72-4b27-853e-7abec2318e99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad36f44a-1ac6-4bc3-8356-40d1c4d12c22" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_7c0be54f-7f72-4b27-853e-7abec2318e99" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2b2c95d6-92d2-4a90-9a0b-eeec9d2fb100" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad36f44a-1ac6-4bc3-8356-40d1c4d12c22" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2b2c95d6-92d2-4a90-9a0b-eeec9d2fb100" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_345573fa-4cf3-4c0d-8ff0-de775b3ffef4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ad36f44a-1ac6-4bc3-8356-40d1c4d12c22" xlink:to="loc_us-gaap_PerformanceSharesMember_345573fa-4cf3-4c0d-8ff0-de775b3ffef4" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_974a1fa0-3bff-40af-b3a0-097bb51fbef2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_b7660f8d-dec1-4ffd-a59f-0f33b443227d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_974a1fa0-3bff-40af-b3a0-097bb51fbef2" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_974a1fa0-3bff-40af-b3a0-097bb51fbef2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_974a1fa0-3bff-40af-b3a0-097bb51fbef2" xlink:to="loc_us-gaap_EquityComponentDomain_974a1fa0-3bff-40af-b3a0-097bb51fbef2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3fe9104f-5913-4b33-90ae-ca2035ab8739" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_974a1fa0-3bff-40af-b3a0-097bb51fbef2" xlink:to="loc_us-gaap_EquityComponentDomain_3fe9104f-5913-4b33-90ae-ca2035ab8739" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_bcc63603-bdd7-4ad7-84bb-8287ea31119f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3fe9104f-5913-4b33-90ae-ca2035ab8739" xlink:to="loc_us-gaap_CommonStockMember_bcc63603-bdd7-4ad7-84bb-8287ea31119f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CommonStockIssuedShareRollForward_8e2fcccc-069f-4c1c-b6f5-b0c7c66c8c50" xlink:href="lthm-20231231.xsd#lthm_CommonStockIssuedShareRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_af54e51c-005a-4921-9bc6-09d679af36a4" xlink:to="loc_lthm_CommonStockIssuedShareRollForward_8e2fcccc-069f-4c1c-b6f5-b0c7c66c8c50" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_5d6c2da4-3a02-4b46-817f-aa42167fdea7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_CommonStockIssuedShareRollForward_8e2fcccc-069f-4c1c-b6f5-b0c7c66c8c50" xlink:to="loc_us-gaap_CommonStockSharesIssued_5d6c2da4-3a02-4b46-817f-aa42167fdea7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_69598153-f7c4-456d-894c-1a13ed06fa01" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_CommonStockIssuedShareRollForward_8e2fcccc-069f-4c1c-b6f5-b0c7c66c8c50" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_69598153-f7c4-456d-894c-1a13ed06fa01" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_3a3a069f-5bbd-4ee5-9530-91edef323831" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TreasuryStockRollForward_708b260a-7963-471a-a3cc-91428209b236" xlink:href="lthm-20231231.xsd#lthm_TreasuryStockRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_af54e51c-005a-4921-9bc6-09d679af36a4" xlink:to="loc_lthm_TreasuryStockRollForward_708b260a-7963-471a-a3cc-91428209b236" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_02888587-35a1-492a-a117-f16735fa9200" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_TreasuryStockRollForward_708b260a-7963-471a-a3cc-91428209b236" xlink:to="loc_us-gaap_TreasuryStockCommonShares_02888587-35a1-492a-a117-f16735fa9200" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_7f96a5fc-ce90-46ac-b742-2aab56eddce0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_TreasuryStockRollForward_708b260a-7963-471a-a3cc-91428209b236" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_7f96a5fc-ce90-46ac-b742-2aab56eddce0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_34182abe-6209-420f-af67-68ebd5b9d17a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CommonStockOutstandingSharesRollForward_d38de472-5742-4fd4-87d0-ed8fcc330426" xlink:href="lthm-20231231.xsd#lthm_CommonStockOutstandingSharesRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_af54e51c-005a-4921-9bc6-09d679af36a4" xlink:to="loc_lthm_CommonStockOutstandingSharesRollForward_d38de472-5742-4fd4-87d0-ed8fcc330426" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_f5981643-481a-49d3-8ab3-8b6a1c2d345f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_lthm_CommonStockOutstandingSharesRollForward_d38de472-5742-4fd4-87d0-ed8fcc330426" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_f5981643-481a-49d3-8ab3-8b6a1c2d345f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_10eaf19c-842d-42c1-9448-5decd222c39c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_49e2c854-ddb9-4e6c-a88b-3194ecbd2ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_21c1c1f9-5ba3-4fc3-89f4-9466b2459540" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EquityAdditionalInformationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EquityAdditionalInformationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EquityAdditionalInformationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_0294a2a3-9041-4215-af54-f87008095d2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_d93101bd-e6aa-4a60-95e5-8d4720a0bf08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_0294a2a3-9041-4215-af54-f87008095d2b" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_d93101bd-e6aa-4a60-95e5-8d4720a0bf08" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_45eaa07b-c98b-4951-a95b-ef2a00599a68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_d93101bd-e6aa-4a60-95e5-8d4720a0bf08" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_45eaa07b-c98b-4951-a95b-ef2a00599a68" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_45eaa07b-c98b-4951-a95b-ef2a00599a68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_45eaa07b-c98b-4951-a95b-ef2a00599a68" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_45eaa07b-c98b-4951-a95b-ef2a00599a68_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_097201a7-dfd8-4046-b413-1b1d2222705b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_45eaa07b-c98b-4951-a95b-ef2a00599a68" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_097201a7-dfd8-4046-b413-1b1d2222705b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_QuebecLithiumPartnersUKMember_1db1413c-6051-4336-b471-c688d533b623" xlink:href="lthm-20231231.xsd#lthm_QuebecLithiumPartnersUKMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_097201a7-dfd8-4046-b413-1b1d2222705b" xlink:to="loc_lthm_QuebecLithiumPartnersUKMember_1db1413c-6051-4336-b471-c688d533b623" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_94fa153b-801c-478c-8b36-cffd1df0c088" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0294a2a3-9041-4215-af54-f87008095d2b" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_94fa153b-801c-478c-8b36-cffd1df0c088" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_819588ac-dd32-42e8-bac6-c4298e742778" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0294a2a3-9041-4215-af54-f87008095d2b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_819588ac-dd32-42e8-bac6-c4298e742778" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f47f6a51-d9be-46e9-b10a-4727e2a3172d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0294a2a3-9041-4215-af54-f87008095d2b" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_f47f6a51-d9be-46e9-b10a-4727e2a3172d" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EquityScheduleofAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EquityScheduleofAccumulatedOtherComprehensiveLossDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EquityScheduleofAccumulatedOtherComprehensiveLossDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_b1a238af-6534-4a9f-a3d6-99f598c13093" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_195d6084-c484-4367-bd65-fed1457d6984" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_b1a238af-6534-4a9f-a3d6-99f598c13093" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_195d6084-c484-4367-bd65-fed1457d6984" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_d2c11fd0-5444-4ceb-9153-464f1224f954" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_195d6084-c484-4367-bd65-fed1457d6984" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_d2c11fd0-5444-4ceb-9153-464f1224f954" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d2c11fd0-5444-4ceb-9153-464f1224f954_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d2c11fd0-5444-4ceb-9153-464f1224f954" xlink:to="loc_us-gaap_EquityComponentDomain_d2c11fd0-5444-4ceb-9153-464f1224f954_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_bebefd4d-ca41-4305-8fb3-8b6eb5c8cc5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_d2c11fd0-5444-4ceb-9153-464f1224f954" xlink:to="loc_us-gaap_EquityComponentDomain_bebefd4d-ca41-4305-8fb3-8b6eb5c8cc5b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e5f61e3a-3940-47c7-9cd1-0d712580f060" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_bebefd4d-ca41-4305-8fb3-8b6eb5c8cc5b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e5f61e3a-3940-47c7-9cd1-0d712580f060" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_448e787a-765f-48d4-ab7b-0660671365c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e5f61e3a-3940-47c7-9cd1-0d712580f060" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_448e787a-765f-48d4-ab7b-0660671365c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_cfabb9ae-097f-4ad1-9b33-0e96fac10166" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e5f61e3a-3940-47c7-9cd1-0d712580f060" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_cfabb9ae-097f-4ad1-9b33-0e96fac10166" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_67dfb306-346e-4881-b625-0c8c38dd28d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_b1a238af-6534-4a9f-a3d6-99f598c13093" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_67dfb306-346e-4881-b625-0c8c38dd28d6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_de98cf03-7f8f-4300-931a-76d9bb84945b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_67dfb306-346e-4881-b625-0c8c38dd28d6" xlink:to="loc_us-gaap_StockholdersEquity_de98cf03-7f8f-4300-931a-76d9bb84945b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_92d00baa-eb0b-412e-b14e-db43d58888ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_67dfb306-346e-4881-b625-0c8c38dd28d6" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_92d00baa-eb0b-412e-b14e-db43d58888ad" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_35a7b426-a0b1-4140-b2f1-de6b8ff14e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_67dfb306-346e-4881-b625-0c8c38dd28d6" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_35a7b426-a0b1-4140-b2f1-de6b8ff14e1b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8b2c8025-6aa5-4790-886f-0c968a508d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EquityReclassificationOutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EquityReclassificationOutofAccumulatedOtherComprehensiveIncomeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EquityReclassificationOutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_c6756ad1-90c1-4cb9-8e56-4e10d3bc6e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_c6756ad1-90c1-4cb9-8e56-4e10d3bc6e2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_c6756ad1-90c1-4cb9-8e56-4e10d3bc6e2d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6fec43c5-8e67-4045-8f7a-b16160578543" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bf3fb5e3-00e2-4d1c-9e36-62ff047164cf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6fec43c5-8e67-4045-8f7a-b16160578543" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_07081e78-d9bf-4a7a-88ff-38771b0bb165" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeContractMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6fec43c5-8e67-4045-8f7a-b16160578543" xlink:to="loc_us-gaap_ForeignExchangeContractMember_07081e78-d9bf-4a7a-88ff-38771b0bb165" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_a2118381-d9f8-4f89-94f5-932ff2bb00cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_c6756ad1-90c1-4cb9-8e56-4e10d3bc6e2d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_a2118381-d9f8-4f89-94f5-932ff2bb00cd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a2118381-d9f8-4f89-94f5-932ff2bb00cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a2118381-d9f8-4f89-94f5-932ff2bb00cd" xlink:to="loc_us-gaap_EquityComponentDomain_a2118381-d9f8-4f89-94f5-932ff2bb00cd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f89977bf-f870-40ee-adda-3ceeb8f74743" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_a2118381-d9f8-4f89-94f5-932ff2bb00cd" xlink:to="loc_us-gaap_EquityComponentDomain_f89977bf-f870-40ee-adda-3ceeb8f74743" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_288dc33d-6427-48d5-9b87-505dab23e830" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f89977bf-f870-40ee-adda-3ceeb8f74743" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_288dc33d-6427-48d5-9b87-505dab23e830" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_195455b0-adc3-4535-830a-ee689fa155b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_c6756ad1-90c1-4cb9-8e56-4e10d3bc6e2d" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_195455b0-adc3-4535-830a-ee689fa155b2" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_195455b0-adc3-4535-830a-ee689fa155b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_195455b0-adc3-4535-830a-ee689fa155b2" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_195455b0-adc3-4535-830a-ee689fa155b2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_6933937f-2b11-4869-a322-d7576f16a74b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_195455b0-adc3-4535-830a-ee689fa155b2" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_6933937f-2b11-4869-a322-d7576f16a74b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_9ff0c050-8343-4d3f-9131-303659f9f689" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_6933937f-2b11-4869-a322-d7576f16a74b" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_9ff0c050-8343-4d3f-9131-303659f9f689" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_b5a993e1-16ec-431b-95c0-f82a4134c26c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_b5a993e1-16ec-431b-95c0-f82a4134c26c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bd7687ca-03e3-4530-ac14-f7e9c2e021c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bd7687ca-03e3-4530-ac14-f7e9c2e021c2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0bc75baa-8516-4aeb-b713-e04003753678" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0bc75baa-8516-4aeb-b713-e04003753678" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c5b24b6e-3296-46f4-940c-90377cf29b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e7cd0f17-cdf3-47f9-a0bb-89509c16aac3" xlink:to="loc_us-gaap_NetIncomeLoss_c5b24b6e-3296-46f4-940c-90377cf29b2e" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EarningsPerShareEPSComputationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EarningsPerShareEPSComputationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EarningsPerShareEPSComputationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_c117b655-f7d2-44a6-b9ec-931933e90c37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_c117b655-f7d2-44a6-b9ec-931933e90c37" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ab368a19-bda2-4d76-bf7f-07ca14e31478" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_c117b655-f7d2-44a6-b9ec-931933e90c37" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ab368a19-bda2-4d76-bf7f-07ca14e31478" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ab368a19-bda2-4d76-bf7f-07ca14e31478_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ab368a19-bda2-4d76-bf7f-07ca14e31478" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ab368a19-bda2-4d76-bf7f-07ca14e31478_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_85e22138-b9e1-4434-9447-917c5bf74246" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ab368a19-bda2-4d76-bf7f-07ca14e31478" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_85e22138-b9e1-4434-9447-917c5bf74246" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_04820084-82b7-40ab-9910-74d9f82079a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_85e22138-b9e1-4434-9447-917c5bf74246" xlink:to="loc_us-gaap_ConvertibleDebtMember_04820084-82b7-40ab-9910-74d9f82079a4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_3d62066e-5b91-41c7-9874-9eac6d060d1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:to="loc_us-gaap_NetIncomeLoss_3d62066e-5b91-41c7-9874-9eac6d060d1e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalizedAdjustment_844fb87d-faa5-4f1b-8f4a-1549c4ce0b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalizedAdjustment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:to="loc_us-gaap_InterestCostsCapitalizedAdjustment_844fb87d-faa5-4f1b-8f4a-1549c4ce0b0f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_419ca183-28f2-431a-a92f-4943afd0f243" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_419ca183-28f2-431a-a92f-4943afd0f243" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_68ca28cc-373b-4398-8443-de453560a551" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_9257299e-91ed-42fd-b82d-6b11068c654c" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_68ca28cc-373b-4398-8443-de453560a551" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b9aea9ab-e451-4151-87a1-8ce41340847d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b9aea9ab-e451-4151-87a1-8ce41340847d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_4908fe7d-46a2-47a9-9655-6a57d312fb7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_4908fe7d-46a2-47a9-9655-6a57d312fb7a" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_759a638c-eb9b-46f8-875f-ab3af061327f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_759a638c-eb9b-46f8-875f-ab3af061327f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_f160b83d-da9e-4c84-94b0-6eb4e3a9bac5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2a8fa90d-5f72-479b-b5f9-3a6eaea50d64" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_f160b83d-da9e-4c84-94b0-6eb4e3a9bac5" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_51a4de14-1623-4714-bd6d-a9aad7f396ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_51a4de14-1623-4714-bd6d-a9aad7f396ff" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_b1845dad-a1e9-4dc2-8801-055ebd6a3e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_51a4de14-1623-4714-bd6d-a9aad7f396ff" xlink:to="loc_us-gaap_EarningsPerShareBasic_b1845dad-a1e9-4dc2-8801-055ebd6a3e7c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_c320071c-e544-431d-9027-c9f7b47dda45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_c320071c-e544-431d-9027-c9f7b47dda45" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_be3b4234-d781-4a6d-8c9a-22a9fd3690d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_c320071c-e544-431d-9027-c9f7b47dda45" xlink:to="loc_us-gaap_EarningsPerShareDiluted_be3b4234-d781-4a6d-8c9a-22a9fd3690d4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_e03dccd4-1d14-49d7-ad36-0c3b6573ab7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_67dcd3ab-d117-48e8-9a7d-e112e9b8e6ba" xlink:to="loc_us-gaap_InterestCostsCapitalized_e03dccd4-1d14-49d7-ad36-0c3b6573ab7d" xlink:type="arc" order="4"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#EarningsPerShareNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1da7c96c-40c2-455b-ad3c-bc42fa6303a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f6f30fcf-c297-4a49-a75a-c0d4ec821853" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1da7c96c-40c2-455b-ad3c-bc42fa6303a3" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f6f30fcf-c297-4a49-a75a-c0d4ec821853" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb3ce382-7beb-450b-b5e8-a637123365c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f6f30fcf-c297-4a49-a75a-c0d4ec821853" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb3ce382-7beb-450b-b5e8-a637123365c8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fb3ce382-7beb-450b-b5e8-a637123365c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb3ce382-7beb-450b-b5e8-a637123365c8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fb3ce382-7beb-450b-b5e8-a637123365c8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c015ce90-68f0-4127-ace4-96fe1d4c29f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_fb3ce382-7beb-450b-b5e8-a637123365c8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c015ce90-68f0-4127-ace4-96fe1d4c29f7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_736da660-064c-43c2-bcba-9756e721923c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_c015ce90-68f0-4127-ace4-96fe1d4c29f7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_736da660-064c-43c2-bcba-9756e721923c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3bae528f-58e7-4b2c-9aca-9648cf70cf3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1da7c96c-40c2-455b-ad3c-bc42fa6303a3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3bae528f-58e7-4b2c-9aca-9648cf70cf3c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_a318494d-347d-4243-aee5-b13b5d1fa73b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1da7c96c-40c2-455b-ad3c-bc42fa6303a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_a318494d-347d-4243-aee5-b13b5d1fa73b" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#FinancialInstrumentsRiskManagementandFairValueMeasurementsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_55ca0d11-3a5c-45a7-844c-9265a1f9e3a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:to="loc_us-gaap_DerivativeTable_55ca0d11-3a5c-45a7-844c-9265a1f9e3a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_6cdb6a11-2c95-4c25-bbc7-b60566d4026b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_55ca0d11-3a5c-45a7-844c-9265a1f9e3a5" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_6cdb6a11-2c95-4c25-bbc7-b60566d4026b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6cdb6a11-2c95-4c25-bbc7-b60566d4026b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6cdb6a11-2c95-4c25-bbc7-b60566d4026b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6cdb6a11-2c95-4c25-bbc7-b60566d4026b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_dbfb917a-8d41-4739-853d-6fc2f07c90ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6cdb6a11-2c95-4c25-bbc7-b60566d4026b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_dbfb917a-8d41-4739-853d-6fc2f07c90ee" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_940a0e9b-fe1a-4703-b355-44e6218e23fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeContractMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_dbfb917a-8d41-4739-853d-6fc2f07c90ee" xlink:to="loc_us-gaap_ForeignExchangeContractMember_940a0e9b-fe1a-4703-b355-44e6218e23fc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_26d41cdb-18dc-417c-8109-f543bb74204c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_55ca0d11-3a5c-45a7-844c-9265a1f9e3a5" xlink:to="loc_us-gaap_HedgingDesignationAxis_26d41cdb-18dc-417c-8109-f543bb74204c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_26d41cdb-18dc-417c-8109-f543bb74204c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_26d41cdb-18dc-417c-8109-f543bb74204c" xlink:to="loc_us-gaap_HedgingDesignationDomain_26d41cdb-18dc-417c-8109-f543bb74204c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_6e5b05cb-91cd-4542-b0c3-8bdbd59c5bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_26d41cdb-18dc-417c-8109-f543bb74204c" xlink:to="loc_us-gaap_HedgingDesignationDomain_6e5b05cb-91cd-4542-b0c3-8bdbd59c5bdf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_7f5fe90a-47cf-44b9-a83f-677ed26c6c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NondesignatedMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6e5b05cb-91cd-4542-b0c3-8bdbd59c5bdf" xlink:to="loc_us-gaap_NondesignatedMember_7f5fe90a-47cf-44b9-a83f-677ed26c6c3b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_7531810e-d550-420d-afa0-9615f070c2a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6e5b05cb-91cd-4542-b0c3-8bdbd59c5bdf" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_7531810e-d550-420d-afa0-9615f070c2a1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_abf32584-3280-4914-ab27-b47633305ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_55ca0d11-3a5c-45a7-844c-9265a1f9e3a5" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_abf32584-3280-4914-ab27-b47633305ee3" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_abf32584-3280-4914-ab27-b47633305ee3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_abf32584-3280-4914-ab27-b47633305ee3" xlink:to="loc_us-gaap_HedgingRelationshipDomain_abf32584-3280-4914-ab27-b47633305ee3_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_ccb53008-243f-4646-8aaa-91783b984cfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_abf32584-3280-4914-ab27-b47633305ee3" xlink:to="loc_us-gaap_HedgingRelationshipDomain_ccb53008-243f-4646-8aaa-91783b984cfb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_90dccf3f-c7c8-4e3e-bcca-f64c05df5c55" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowHedgingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_ccb53008-243f-4646-8aaa-91783b984cfb" xlink:to="loc_us-gaap_CashFlowHedgingMember_90dccf3f-c7c8-4e3e-bcca-f64c05df5c55" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_6ae38fdf-114c-4ed3-9993-1647b6b4640c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:to="loc_us-gaap_LongTermDebtFairValue_6ae38fdf-114c-4ed3-9993-1647b6b4640c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_ce1f77a3-b8e3-4642-835c-324876c60ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:to="loc_us-gaap_LongTermDebt_ce1f77a3-b8e3-4642-835c-324876c60ce9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_09385524-a6d3-480d-837c-894004ac4e24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:to="loc_us-gaap_DerivativeNotionalAmount_09385524-a6d3-480d-837c-894004ac4e24" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_99a3ce20-bd87-4ecb-bec6-a9dd7488f970" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_f2015514-3b94-49d7-9f78-046f9ede5b59" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_99a3ce20-bd87-4ecb-bec6-a9dd7488f970" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesinCashFlowHedgingRelationshipsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesinCashFlowHedgingRelationshipsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesinCashFlowHedgingRelationshipsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_77595555-75b4-4532-be6a-25a086575e2e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_a170fd82-9733-4ea5-9375-c215e4711460" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_77595555-75b4-4532-be6a-25a086575e2e" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_a170fd82-9733-4ea5-9375-c215e4711460" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_b3e87154-78c9-4024-9d20-bc65307a5e92" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_a170fd82-9733-4ea5-9375-c215e4711460" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_b3e87154-78c9-4024-9d20-bc65307a5e92" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_b3e87154-78c9-4024-9d20-bc65307a5e92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_b3e87154-78c9-4024-9d20-bc65307a5e92" xlink:to="loc_us-gaap_EquityComponentDomain_b3e87154-78c9-4024-9d20-bc65307a5e92_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_06d54c73-c8d8-45a1-9884-ce062e90eab1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_b3e87154-78c9-4024-9d20-bc65307a5e92" xlink:to="loc_us-gaap_EquityComponentDomain_06d54c73-c8d8-45a1-9884-ce062e90eab1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_c31bb37c-d066-458d-830d-7d60bf4ab217" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_06d54c73-c8d8-45a1-9884-ce062e90eab1" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_c31bb37c-d066-458d-830d-7d60bf4ab217" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_77595555-75b4-4532-be6a-25a086575e2e" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_780aae2d-cead-4a18-ad45-4b9bce58582e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:to="loc_us-gaap_StockholdersEquity_780aae2d-cead-4a18-ad45-4b9bce58582e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_d1d9b47f-633b-4f42-a194-9d916462172e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_d1d9b47f-633b-4f42-a194-9d916462172e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_83bed9d2-d52c-4b86-ab70-16b19a8f8acb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_83bed9d2-d52c-4b86-ab70-16b19a8f8acb" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_c609a05f-e3a9-413f-adb0-669223a618b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7f19730e-b671-4af8-b596-5cee4d67e12d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_c609a05f-e3a9-413f-adb0-669223a618b1" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b125d526-a0d1-41dd-884b-d76760a35fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesNotDesignatedAsCashFlowHedgingInstrumentsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesNotDesignatedAsCashFlowHedgingInstrumentsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsDerivativesNotDesignatedAsCashFlowHedgingInstrumentsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_32dfd40b-9d99-4dd3-8333-2c147f34c5ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_985afd61-8602-40f1-af42-8ccab20433a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_32dfd40b-9d99-4dd3-8333-2c147f34c5ce" xlink:to="loc_us-gaap_DerivativeTable_985afd61-8602-40f1-af42-8ccab20433a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_985afd61-8602-40f1-af42-8ccab20433a7" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8fc73945-ff03-49d5-82fa-c7a5585d7cab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b4e1821b-3387-4602-8b0f-0aab0e6e1dd6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8fc73945-ff03-49d5-82fa-c7a5585d7cab" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_ae63d775-7c9e-4378-9fae-b8a685afc418" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeContractMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_8fc73945-ff03-49d5-82fa-c7a5585d7cab" xlink:to="loc_us-gaap_ForeignExchangeContractMember_ae63d775-7c9e-4378-9fae-b8a685afc418" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_1cc6567f-5f53-4665-bf7f-cc5c068b2e65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_32dfd40b-9d99-4dd3-8333-2c147f34c5ce" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_1cc6567f-5f53-4665-bf7f-cc5c068b2e65" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_bfdbadd6-a9fc-42dc-a3db-b7009dbf9165" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_32dfd40b-9d99-4dd3-8333-2c147f34c5ce" xlink:to="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_bfdbadd6-a9fc-42dc-a3db-b7009dbf9165" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsRecurringFairValueMeasurementsDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#FinancialInstrumentsRiskManagementandFairValueMeasurementsRecurringFairValueMeasurementsDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/FinancialInstrumentsRiskManagementandFairValueMeasurementsRecurringFairValueMeasurementsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_551dbf73-c646-418e-b7fc-271e1a32a334" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_551dbf73-c646-418e-b7fc-271e1a32a334" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_40f7e0bd-2edc-41e1-ac76-7a73c3eda573" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_40f7e0bd-2edc-41e1-ac76-7a73c3eda573" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_40f7e0bd-2edc-41e1-ac76-7a73c3eda573_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_40f7e0bd-2edc-41e1-ac76-7a73c3eda573" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_40f7e0bd-2edc-41e1-ac76-7a73c3eda573_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_54093e34-e221-4598-8e9d-ce1ea452025b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_40f7e0bd-2edc-41e1-ac76-7a73c3eda573" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_54093e34-e221-4598-8e9d-ce1ea452025b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_d13bc5df-35e2-4771-b384-d6914b0ac4e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_54093e34-e221-4598-8e9d-ce1ea452025b" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_d13bc5df-35e2-4771-b384-d6914b0ac4e2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f8b5a4cf-cdc3-443a-bae6-24cfb8041139" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f8b5a4cf-cdc3-443a-bae6-24cfb8041139" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f8b5a4cf-cdc3-443a-bae6-24cfb8041139_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f8b5a4cf-cdc3-443a-bae6-24cfb8041139" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f8b5a4cf-cdc3-443a-bae6-24cfb8041139_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_45950093-4b9d-4245-979e-9f9004d8e5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f8b5a4cf-cdc3-443a-bae6-24cfb8041139" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_45950093-4b9d-4245-979e-9f9004d8e5e5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_b1b494cd-97a9-47fd-bf51-ec104c7ec0df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_45950093-4b9d-4245-979e-9f9004d8e5e5" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_b1b494cd-97a9-47fd-bf51-ec104c7ec0df" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_1cdb0a94-ddf8-42df-8f24-4dd3515d050d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_45950093-4b9d-4245-979e-9f9004d8e5e5" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_1cdb0a94-ddf8-42df-8f24-4dd3515d050d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_4161b8d4-a639-4a8b-96da-b3d2fa03b9c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_45950093-4b9d-4245-979e-9f9004d8e5e5" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_4161b8d4-a639-4a8b-96da-b3d2fa03b9c1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_2db1668d-658f-4250-a927-f0ef6991031c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_2db1668d-658f-4250-a927-f0ef6991031c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_2db1668d-658f-4250-a927-f0ef6991031c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_2db1668d-658f-4250-a927-f0ef6991031c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_2db1668d-658f-4250-a927-f0ef6991031c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_b1772dad-64f9-48d7-8e73-2dea62aa044b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_2db1668d-658f-4250-a927-f0ef6991031c" xlink:to="loc_us-gaap_HedgingRelationshipDomain_b1772dad-64f9-48d7-8e73-2dea62aa044b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_6dab16f4-2ec3-4dc2-a5d3-4ab2440fc0b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowHedgingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_b1772dad-64f9-48d7-8e73-2dea62aa044b" xlink:to="loc_us-gaap_CashFlowHedgingMember_6dab16f4-2ec3-4dc2-a5d3-4ab2440fc0b9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1176ade0-f74d-4ea9-b387-34a46302e73d" xlink:to="loc_us-gaap_HedgingDesignationAxis_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5" xlink:to="loc_us-gaap_HedgingDesignationDomain_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_8f21f7ec-d54d-4d32-bb09-119a97af1f02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_2b3a7dca-1d82-4fa6-81cb-22bda209bcf5" xlink:to="loc_us-gaap_HedgingDesignationDomain_8f21f7ec-d54d-4d32-bb09-119a97af1f02" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_fb9333e4-31a7-4e7c-9bb8-35a67b5636dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8f21f7ec-d54d-4d32-bb09-119a97af1f02" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_fb9333e4-31a7-4e7c-9bb8-35a67b5636dd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_89a7d036-6985-4f61-8296-825f7a85cd1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_551dbf73-c646-418e-b7fc-271e1a32a334" xlink:to="loc_us-gaap_AssetsAbstract_89a7d036-6985-4f61-8296-825f7a85cd1e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_1270e8e2-ff35-45b1-aae0-66716c294813" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_89a7d036-6985-4f61-8296-825f7a85cd1e" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_1270e8e2-ff35-45b1-aae0-66716c294813" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_03d3511b-c039-4807-b132-77404cecb645" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosure"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_89a7d036-6985-4f61-8296-825f7a85cd1e" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_03d3511b-c039-4807-b132-77404cecb645" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_e5251b04-caa1-4db9-91c7-738e9207f3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_551dbf73-c646-418e-b7fc-271e1a32a334" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_e5251b04-caa1-4db9-91c7-738e9207f3e7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_dd92ff6d-b7cc-4d5e-8241-5cfb69855b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_e5251b04-caa1-4db9-91c7-738e9207f3e7" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_dd92ff6d-b7cc-4d5e-8241-5cfb69855b1b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_33910999-431a-4188-ae63-77b12813b7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_e5251b04-caa1-4db9-91c7-738e9207f3e7" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_33910999-431a-4188-ae63-77b12813b7bd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_8355bf2f-cb48-4d80-8e5a-b3d534025699" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_551dbf73-c646-418e-b7fc-271e1a32a334" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_8355bf2f-cb48-4d80-8e5a-b3d534025699" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#CommitmentsandContingenciesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_27401815-a766-47a2-bd43-5097180fdb31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorLeaseDescriptionTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_27401815-a766-47a2-bd43-5097180fdb31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_bcb040d7-ebf9-47db-a299-c922802792c7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_27401815-a766-47a2-bd43-5097180fdb31" xlink:to="loc_srt_RangeAxis_bcb040d7-ebf9-47db-a299-c922802792c7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bcb040d7-ebf9-47db-a299-c922802792c7_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_bcb040d7-ebf9-47db-a299-c922802792c7" xlink:to="loc_srt_RangeMember_bcb040d7-ebf9-47db-a299-c922802792c7_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_743e1b8c-c61c-40e1-83f4-4ef97370864b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_bcb040d7-ebf9-47db-a299-c922802792c7" xlink:to="loc_srt_RangeMember_743e1b8c-c61c-40e1-83f4-4ef97370864b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3c75941d-7214-4434-ba5c-7cd663d8f3f6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_743e1b8c-c61c-40e1-83f4-4ef97370864b" xlink:to="loc_srt_MinimumMember_3c75941d-7214-4434-ba5c-7cd663d8f3f6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_bc1be00b-c03a-4593-bfc3-cd099357dad5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_743e1b8c-c61c-40e1-83f4-4ef97370864b" xlink:to="loc_srt_MaximumMember_bc1be00b-c03a-4593-bfc3-cd099357dad5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_ff298d24-62e9-482e-a209-dd54c65dc461" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_ff298d24-62e9-482e-a209-dd54c65dc461" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_f84f8736-d3c5-4c03-9842-b2b8b38b8470" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_f84f8736-d3c5-4c03-9842-b2b8b38b8470" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_46e1d3ac-79a7-41a2-b008-c1141a913dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_46e1d3ac-79a7-41a2-b008-c1141a913dfe" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportRebatePercentageOfFreightOnBoardValueCollected_7f4af047-5473-4d0f-83c6-75070798ca2f" xlink:href="lthm-20231231.xsd#lthm_ExportRebatePercentageOfFreightOnBoardValueCollected"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_lthm_ExportRebatePercentageOfFreightOnBoardValueCollected_7f4af047-5473-4d0f-83c6-75070798ca2f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportLAPunaRebatePercentageOfFreightOnBoardValueCollected_dcdf7eae-b091-4f56-910b-942c95a4240d" xlink:href="lthm-20231231.xsd#lthm_ExportLAPunaRebatePercentageOfFreightOnBoardValueCollected"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_lthm_ExportLAPunaRebatePercentageOfFreightOnBoardValueCollected_dcdf7eae-b091-4f56-910b-942c95a4240d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_RemainingExportRebatePercentageOfFreightOnBoardValueCollected_b6bb5be5-3eef-4c08-8bf8-074dbb2dca90" xlink:href="lthm-20231231.xsd#lthm_RemainingExportRebatePercentageOfFreightOnBoardValueCollected"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_lthm_RemainingExportRebatePercentageOfFreightOnBoardValueCollected_b6bb5be5-3eef-4c08-8bf8-074dbb2dca90" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportRebateReceivable_9fabe679-869d-40c3-83a7-33965a97a7fa" xlink:href="lthm-20231231.xsd#lthm_ExportRebateReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6774e7f4-1f6c-4036-930d-1d1e32073a2a" xlink:to="loc_lthm_ExportRebateReceivable_9fabe679-869d-40c3-83a7-33965a97a7fa" xlink:type="arc" order="6"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/SupplementalInformationDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#SupplementalInformationDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/SupplementalInformationDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedBalanceSheetStatementsCaptionsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementTable_507b2664-3c09-491d-bdc4-56bb7abaef03" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedBalanceSheetStatementTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_srt_CondensedBalanceSheetStatementTable_507b2664-3c09-491d-bdc4-56bb7abaef03" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_420e9164-32af-45e4-b0bf-16ad43299b1b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_507b2664-3c09-491d-bdc4-56bb7abaef03" xlink:to="loc_srt_CounterpartyNameAxis_420e9164-32af-45e4-b0bf-16ad43299b1b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_420e9164-32af-45e4-b0bf-16ad43299b1b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_420e9164-32af-45e4-b0bf-16ad43299b1b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_420e9164-32af-45e4-b0bf-16ad43299b1b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_485b2ec0-216e-43ec-8268-01245a332280" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_420e9164-32af-45e4-b0bf-16ad43299b1b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_485b2ec0-216e-43ec-8268-01245a332280" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ArgentinaGovernmentMember_fe8d76e0-7671-4bc9-85a9-ee7a728e3bd0" xlink:href="lthm-20231231.xsd#lthm_ArgentinaGovernmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_485b2ec0-216e-43ec-8268-01245a332280" xlink:to="loc_lthm_ArgentinaGovernmentMember_fe8d76e0-7671-4bc9-85a9-ee7a728e3bd0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_f1940e3a-cb59-4be5-a80a-d5365aa0027e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_507b2664-3c09-491d-bdc4-56bb7abaef03" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_f1940e3a-cb59-4be5-a80a-d5365aa0027e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_f1940e3a-cb59-4be5-a80a-d5365aa0027e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_f1940e3a-cb59-4be5-a80a-d5365aa0027e" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_f1940e3a-cb59-4be5-a80a-d5365aa0027e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_bdd83ee5-8113-4784-bf84-ca4a04ad752d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_f1940e3a-cb59-4be5-a80a-d5365aa0027e" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_bdd83ee5-8113-4784-bf84-ca4a04ad752d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TMAAgreementUncertainTaxPositionsMember_88edbbb5-83ef-4b82-9ac8-f5b0c337f5cb" xlink:href="lthm-20231231.xsd#lthm_TMAAgreementUncertainTaxPositionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_bdd83ee5-8113-4784-bf84-ca4a04ad752d" xlink:to="loc_lthm_TMAAgreementUncertainTaxPositionsMember_88edbbb5-83ef-4b82-9ac8-f5b0c337f5cb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_TMAAgreementIndemnificationLiabilityMember_83bace3e-0072-4ce8-a4a4-2a89d9fa8d2f" xlink:href="lthm-20231231.xsd#lthm_TMAAgreementIndemnificationLiabilityMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_bdd83ee5-8113-4784-bf84-ca4a04ad752d" xlink:to="loc_lthm_TMAAgreementIndemnificationLiabilityMember_83bace3e-0072-4ce8-a4a4-2a89d9fa8d2f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_bbf94a31-aeb3-4096-a526-d64734762396" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_us-gaap_IncomeTaxReceivable_bbf94a31-aeb3-4096-a526-d64734762396" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ReceivableFromGovernmentEntitiesCurrent_c3fa32c3-6901-4017-ad45-b514677ea9ef" xlink:href="lthm-20231231.xsd#lthm_ReceivableFromGovernmentEntitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_lthm_ReceivableFromGovernmentEntitiesCurrent_c3fa32c3-6901-4017-ad45-b514677ea9ef" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_351b9bff-65ee-42a0-82ac-378a2dfe6863" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_351b9bff-65ee-42a0-82ac-378a2dfe6863" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_e6cd157d-7262-448a-bd58-e4bc6f787a51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherReceivablesNetCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_e6cd157d-7262-448a-bd58-e4bc6f787a51" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BankAcceptanceDraftReceivableCurrent_ef3c96af-6096-4c8f-8cce-b5bfff9149b7" xlink:href="lthm-20231231.xsd#lthm_BankAcceptanceDraftReceivableCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_lthm_BankAcceptanceDraftReceivableCurrent_ef3c96af-6096-4c8f-8cce-b5bfff9149b7" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_9edda22f-5400-447e-99e7-6b3fcc687df5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_us-gaap_OtherAssetsCurrent_9edda22f-5400-447e-99e7-6b3fcc687df5" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_528d6092-fa6a-45c3-8716-8dcc770c5308" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract_0f98e371-a03f-40c4-9a86-01e46707b75e" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_528d6092-fa6a-45c3-8716-8dcc770c5308" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ReceivableFromGovernmentEntitiesNoncurrent_edd9fcbc-aa48-4d16-8832-aec8483c0a98" xlink:href="lthm-20231231.xsd#lthm_ReceivableFromGovernmentEntitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_lthm_ReceivableFromGovernmentEntitiesNoncurrent_edd9fcbc-aa48-4d16-8832-aec8483c0a98" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseNoncurrent_be551fee-9407-4bb5-afa1-1f4f536da6e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_PrepaidExpenseNoncurrent_be551fee-9407-4bb5-afa1-1f4f536da6e0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNoncurrent_eb9b4952-9d28-455e-a463-1e9df9139809" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_InventoryNoncurrent_eb9b4952-9d28-455e-a463-1e9df9139809" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_6467133c-bc55-414e-9268-d6a337a79007" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_6467133c-bc55-414e-9268-d6a337a79007" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivableNoncurrent_034309b5-9a10-4c54-a72f-c20c51315897" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxesReceivableNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_IncomeTaxesReceivableNoncurrent_034309b5-9a10-4c54-a72f-c20c51315897" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_881b00c7-4335-456c-9072-cf926b83ef80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_881b00c7-4335-456c-9072-cf926b83ef80" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_59d1f012-51a2-42fd-94b6-0cac77ceaf33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsAbstract_36403510-264e-4463-8ae6-456ccdd1af78" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_59d1f012-51a2-42fd-94b6-0cac77ceaf33" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportTaxAndExportRebateReceivable_145d7ac6-dc60-4d9a-829e-8015ac046cc0" xlink:href="lthm-20231231.xsd#lthm_ExportTaxAndExportRebateReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_lthm_ExportTaxAndExportRebateReceivable_145d7ac6-dc60-4d9a-829e-8015ac046cc0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportTaxReceivablePortion_f0d4e9ce-8edd-43b2-a4d8-632ddf853631" xlink:href="lthm-20231231.xsd#lthm_ExportTaxReceivablePortion"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_lthm_ExportTaxReceivablePortion_f0d4e9ce-8edd-43b2-a4d8-632ddf853631" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_78e390d4-a393-4d84-9122-adee149c9dcf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_78e390d4-a393-4d84-9122-adee149c9dcf" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_ExportDutiesDeposit_4083ff14-6fed-4dd7-992c-b9990e2428b9" xlink:href="lthm-20231231.xsd#lthm_ExportDutiesDeposit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_lthm_ExportDutiesDeposit_4083ff14-6fed-4dd7-992c-b9990e2428b9" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_39f3404d-31dd-4329-a3a4-b0cc2bb4c17a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_39f3404d-31dd-4329-a3a4-b0cc2bb4c17a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_InvestmentsInAndAdvancesToAffiliatesAmountOfLiabilityCurrent_9802b992-8f57-477d-a3ae-24e1eff4fcc5" xlink:href="lthm-20231231.xsd#lthm_InvestmentsInAndAdvancesToAffiliatesAmountOfLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_lthm_InvestmentsInAndAdvancesToAffiliatesAmountOfLiabilityCurrent_9802b992-8f57-477d-a3ae-24e1eff4fcc5" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_2431f365-61a8-4e11-a675-ef6fa62bd8b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserve"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_RestructuringReserve_2431f365-61a8-4e11-a675-ef6fa62bd8b7" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostemploymentBenefitsLiabilityCurrent_1c04d28e-7690-494d-afcd-bcdff4b08f86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PostemploymentBenefitsLiabilityCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_PostemploymentBenefitsLiabilityCurrent_1c04d28e-7690-494d-afcd-bcdff4b08f86" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_653a4a20-ff86-486f-86e6-1694e7d1e709" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_653a4a20-ff86-486f-86e6-1694e7d1e709" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_AccruedSeveranceCosts_c92fe3d5-efd3-4f00-8c9e-814502d8a13c" xlink:href="lthm-20231231.xsd#lthm_AccruedSeveranceCosts"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_lthm_AccruedSeveranceCosts_c92fe3d5-efd3-4f00-8c9e-814502d8a13c" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_09b8d381-a2dd-418d-840e-c49bd50cce80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_09b8d381-a2dd-418d-840e-c49bd50cce80" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_8b5e4614-0139-4f82-b6f8-c71b63f2cdc2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilitiesAbstract_fe605a22-9a15-4bfc-a3ea-680a2a79cb1f" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_8b5e4614-0139-4f82-b6f8-c71b63f2cdc2" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_e024141e-cd69-469e-b699-908064d72ce3" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_53822439-644d-4936-ab46-b7886a62daa6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_53822439-644d-4936-ab46-b7886a62daa6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_805746ce-7580-43f0-a376-2f7d0582096f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilityForUncertainTaxPositionsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_805746ce-7580-43f0-a376-2f7d0582096f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserveNoncurrent_9cf8acd3-eb93-45b8-9531-ffe3c125c515" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SelfInsuranceReserveNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_SelfInsuranceReserveNoncurrent_9cf8acd3-eb93-45b8-9531-ffe3c125c515" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_bb2fe61a-8192-4570-b805-f3e6980b053d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetRetirementObligationsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_bb2fe61a-8192-4570-b805-f3e6980b053d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSundryLiabilitiesNoncurrent_43646478-d0ec-41a6-aea6-8aa792967618" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherSundryLiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_OtherSundryLiabilitiesNoncurrent_43646478-d0ec-41a6-aea6-8aa792967618" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_4dd005b3-5e6f-4e5a-93a4-9f10e090ff78" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_55cec5a0-6792-489a-b5d6-2586e6b1be4a" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_4dd005b3-5e6f-4e5a-93a4-9f10e090ff78" xlink:type="arc" order="6"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/SubsequentEventNarrativeDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#SubsequentEventNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/SubsequentEventNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4a452025-9b5b-4e98-b879-85d7227b3454" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4a452025-9b5b-4e98-b879-85d7227b3454" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4a452025-9b5b-4e98-b879-85d7227b3454_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4a452025-9b5b-4e98-b879-85d7227b3454" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4a452025-9b5b-4e98-b879-85d7227b3454_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_da95b6a9-6b34-4e28-8f84-ca47570e4e32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4a452025-9b5b-4e98-b879-85d7227b3454" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_da95b6a9-6b34-4e28-8f84-ca47570e4e32" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_AllkemLiventMergerMember_c505967b-83b6-4eed-8aae-ac0571c2f642" xlink:href="lthm-20231231.xsd#lthm_AllkemLiventMergerMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_da95b6a9-6b34-4e28-8f84-ca47570e4e32" xlink:to="loc_lthm_AllkemLiventMergerMember_c505967b-83b6-4eed-8aae-ac0571c2f642" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_405610f1-a63e-4c8a-8004-28823a026111" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_405610f1-a63e-4c8a-8004-28823a026111" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_405610f1-a63e-4c8a-8004-28823a026111_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_405610f1-a63e-4c8a-8004-28823a026111" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_405610f1-a63e-4c8a-8004-28823a026111_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_3cb373a7-711c-486d-ab89-28c14c0dadf7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_405610f1-a63e-4c8a-8004-28823a026111" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_3cb373a7-711c-486d-ab89-28c14c0dadf7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_5bfaa766-ade8-4385-9648-405d018ce6fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_3cb373a7-711c-486d-ab89-28c14c0dadf7" xlink:to="loc_us-gaap_SubsequentEventMember_5bfaa766-ade8-4385-9648-405d018ce6fc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_5ae271bc-cbf0-44f0-94a7-86a9deadef15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_5ae271bc-cbf0-44f0-94a7-86a9deadef15" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_5ae271bc-cbf0-44f0-94a7-86a9deadef15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5ae271bc-cbf0-44f0-94a7-86a9deadef15" xlink:to="loc_us-gaap_ClassOfStockDomain_5ae271bc-cbf0-44f0-94a7-86a9deadef15_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8ba017d4-9516-403e-9912-331d2f5d9202" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5ae271bc-cbf0-44f0-94a7-86a9deadef15" xlink:to="loc_us-gaap_ClassOfStockDomain_8ba017d4-9516-403e-9912-331d2f5d9202" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_CHESSDepositaryInstrumentMember_87ba3e20-0fe5-4fac-9648-f62583068530" xlink:href="lthm-20231231.xsd#lthm_CHESSDepositaryInstrumentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8ba017d4-9516-403e-9912-331d2f5d9202" xlink:to="loc_lthm_CHESSDepositaryInstrumentMember_87ba3e20-0fe5-4fac-9648-f62583068530" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d67e6585-ddae-4351-a20e-350f77d665da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8ba017d4-9516-403e-9912-331d2f5d9202" xlink:to="loc_us-gaap_CommonStockMember_d67e6585-ddae-4351-a20e-350f77d665da" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_0338d6a3-88e3-4533-a2d4-05c913f38c82" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_b1842081-d82f-46c7-a31b-63f9719d75d9" xlink:to="loc_srt_CounterpartyNameAxis_0338d6a3-88e3-4533-a2d4-05c913f38c82" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0338d6a3-88e3-4533-a2d4-05c913f38c82_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_0338d6a3-88e3-4533-a2d4-05c913f38c82" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0338d6a3-88e3-4533-a2d4-05c913f38c82_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c4911a4f-88c6-489f-83ab-016c4ed3ffea" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_0338d6a3-88e3-4533-a2d4-05c913f38c82" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c4911a4f-88c6-489f-83ab-016c4ed3ffea" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_FormerLiventStockholdersMember_a375a828-ad83-4a89-8be4-2c1df3510f6b" xlink:href="lthm-20231231.xsd#lthm_FormerLiventStockholdersMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c4911a4f-88c6-489f-83ab-016c4ed3ffea" xlink:to="loc_lthm_FormerLiventStockholdersMember_a375a828-ad83-4a89-8be4-2c1df3510f6b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_FormerAllkemShareholdersMember_73df5aeb-5092-41cf-864b-8ab3f0ffbd81" xlink:href="lthm-20231231.xsd#lthm_FormerAllkemShareholdersMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_c4911a4f-88c6-489f-83ab-016c4ed3ffea" xlink:to="loc_lthm_FormerAllkemShareholdersMember_73df5aeb-5092-41cf-864b-8ab3f0ffbd81" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_5068aa60-4d69-414f-b43a-9d675690b8fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_5068aa60-4d69-414f-b43a-9d675690b8fd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BusinessCombinationShareConsiderationPerShare_c8fdcb5c-acf9-4513-ace6-24c736183328" xlink:href="lthm-20231231.xsd#lthm_BusinessCombinationShareConsiderationPerShare"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_lthm_BusinessCombinationShareConsiderationPerShare_c8fdcb5c-acf9-4513-ace6-24c736183328" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_b5908b35-e61f-4c55-a5a1-6d52bc539099" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_b5908b35-e61f-4c55-a5a1-6d52bc539099" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BusinessCombinationConversionRatio_4084c95d-a226-4e46-ba86-533b0c1aa04b" xlink:href="lthm-20231231.xsd#lthm_BusinessCombinationConversionRatio"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_lthm_BusinessCombinationConversionRatio_4084c95d-a226-4e46-ba86-533b0c1aa04b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_855b7fdb-7ae3-406a-aff5-bb85992700b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_855b7fdb-7ae3-406a-aff5-bb85992700b8" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_0da955b0-a889-4824-96e5-0a06b94f0736" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_0da955b0-a889-4824-96e5-0a06b94f0736" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_c6f7c5e2-43cb-4699-a462-b11cd722875f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d26257c1-0415-48f4-ae5e-3bef8ba2f5cd" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_c6f7c5e2-43cb-4699-a462-b11cd722875f" xlink:type="arc" order="6"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.fmclithium.com/role/SubsequentEventEstimatedfairValueoftheConsiderationAssociatedwiththeAllkemLiventMergerDetails" xlink:type="simple" xlink:href="lthm-20231231.xsd#SubsequentEventEstimatedfairValueoftheConsiderationAssociatedwiththeAllkemLiventMergerDetails"/>
<link:definitionLink xlink:role="http://www.fmclithium.com/role/SubsequentEventEstimatedfairValueoftheConsiderationAssociatedwiththeAllkemLiventMergerDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_84f93225-7956-47e2-936a-3220308daae7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_017f5c44-e9ef-49cf-a9b5-cb856e2b0e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_84f93225-7956-47e2-936a-3220308daae7" xlink:to="loc_us-gaap_SubsequentEventTable_017f5c44-e9ef-49cf-a9b5-cb856e2b0e6c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_00e21391-a5ee-45e6-8fe4-7bc910a227b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_017f5c44-e9ef-49cf-a9b5-cb856e2b0e6c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_00e21391-a5ee-45e6-8fe4-7bc910a227b2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_00e21391-a5ee-45e6-8fe4-7bc910a227b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_00e21391-a5ee-45e6-8fe4-7bc910a227b2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_00e21391-a5ee-45e6-8fe4-7bc910a227b2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0219da70-9bb2-4c84-b5b8-9946ba03a572" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_00e21391-a5ee-45e6-8fe4-7bc910a227b2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0219da70-9bb2-4c84-b5b8-9946ba03a572" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_AllkemLiventMergerMember_5e71f832-95fc-4e65-9769-70b86e79f756" xlink:href="lthm-20231231.xsd#lthm_AllkemLiventMergerMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0219da70-9bb2-4c84-b5b8-9946ba03a572" xlink:to="loc_lthm_AllkemLiventMergerMember_5e71f832-95fc-4e65-9769-70b86e79f756" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_398364ca-9c8e-41e1-a733-0cd0fc7c9b23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_017f5c44-e9ef-49cf-a9b5-cb856e2b0e6c" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_398364ca-9c8e-41e1-a733-0cd0fc7c9b23" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_398364ca-9c8e-41e1-a733-0cd0fc7c9b23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_398364ca-9c8e-41e1-a733-0cd0fc7c9b23" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_398364ca-9c8e-41e1-a733-0cd0fc7c9b23_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_93b0cdb9-bd8a-4f8b-98e2-2adae8ab7527" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_398364ca-9c8e-41e1-a733-0cd0fc7c9b23" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_93b0cdb9-bd8a-4f8b-98e2-2adae8ab7527" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_fc600ae6-b4dc-4fed-90e7-555a364a9472" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_93b0cdb9-bd8a-4f8b-98e2-2adae8ab7527" xlink:to="loc_us-gaap_SubsequentEventMember_fc600ae6-b4dc-4fed-90e7-555a364a9472" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_00505ab5-8c4a-4484-b016-2090dce0ba68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_84f93225-7956-47e2-936a-3220308daae7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_00505ab5-8c4a-4484-b016-2090dce0ba68" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_lthm_BusinessCombinationConsiderationTransferredFairValueOfConvertedPerformanceRightsAttributableToPreCombinationService_a32cc905-99eb-4c76-ab3f-b14d9907a812" xlink:href="lthm-20231231.xsd#lthm_BusinessCombinationConsiderationTransferredFairValueOfConvertedPerformanceRightsAttributableToPreCombinationService"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_84f93225-7956-47e2-936a-3220308daae7" xlink:to="loc_lthm_BusinessCombinationConsiderationTransferredFairValueOfConvertedPerformanceRightsAttributableToPreCombinationService_a32cc905-99eb-4c76-ab3f-b14d9907a812" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_dd337301-2fbb-4326-9f69-288d2d598ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_84f93225-7956-47e2-936a-3220308daae7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_dd337301-2fbb-4326-9f69-288d2d598ae1" 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/2023/elts/us-roles-2023.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_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
<link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="5"/>
</link:definitionLink>
</link:linkbase>


21 Previous Filings that this Filing References

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

 1/04/24  Arcadium Lithium plc              8-K12B:1,2, 1/04/24   15:3.5M                                   Broadridge Fin’l So… Inc
12/27/23  Arcadium Lithium plc              8-K:1,5,9  12/20/23   12:1.5M                                   Davis Polk & … LLP 01/FA
12/27/23  Livent Corp.                      8-K:1,9    12/20/23   11:873K                                   Davis Polk & … LLP 01/FA
11/15/23  Arcadium Lithium plc              S-4/A                 21:59M                                    Broadridge Fin’l So… Inc
11/15/23  Livent Corp.                      8-K:8,9    11/15/23   19:42M                                    Broadridge Fin’l So… Inc
11/09/23  Livent Corp.                      10-Q        9/30/23   81:14M
10/30/23  Arcadium Lithium plc              S-4/A                 16:60M                                    Broadridge Fin’l So… Inc
 9/27/23  Allkem Livent plc                 S-4/A                 33:43M                                    Broadridge Fin’l So… Inc
 8/02/23  Livent Corp.                      8-K:1,5,8,9 8/02/23   12:488K                                   Davis Polk & … LLP 01/FA
 5/10/23  Livent Corp.                      8-K:1,9     5/10/23   11:2.2M                                   Davis Polk & … LLP 01/FA
 9/02/22  Livent Corp.                      8-K:1,2,9   9/02/22   11:78M
 8/04/22  Livent Corp.                      10-Q        6/30/22   84:12M
 5/05/22  Livent Corp.                      10-Q        3/31/22   83:9.2M
 2/28/22  Livent Corp.                      10-K       12/31/21  111:20M
 2/26/21  Livent Corp.                      10-K       12/31/20  112:47M
 6/25/20  Livent Corp.                      8-K:1,2,3,9 6/25/20   12:1M                                     Quality EDGAR So… LLC/FA
 2/28/19  Livent Corp.                      10-K       12/31/18  121:15M
10/15/18  Livent Corp.                      8-K:1,8,9  10/10/18   10:1.2M                                   Davis Polk & … LLP 01/FA
10/11/18  Livent Corp.                      S-8        10/11/18    4:222K                                   Davis Polk & … LLP 01/FA
10/01/18  Livent Corp.                      S-1/A                 27:7.7M                                   Donnelley … Solutions/FA
 8/27/18  Livent Corp.                      S-1                    6:4.9M                                   Donnelley … Solutions/FA
Top
Filing Submission 0001977303-24-000008   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Sun., May 12, 3:22:59.2pm ET