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

Tredegar Corp. – ‘10-K’ for 12/31/23 – ‘EX-101.DEF’

On:  Friday, 3/15/24, at 8:23am ET   ·   For:  12/31/23   ·   Accession #:  850429-24-4   ·   File #:  1-10258

Previous ‘10-K’:  ‘10-K’ on 3/16/23 for 12/31/22   ·   Latest ‘10-K’:  This Filing   ·   21 References:   

Find Words in Filings emoji
 
  in    Show  and   Hints

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

 3/15/24  Tredegar Corp.                    10-K       12/31/23  109:15M

Annual Report   —   Form 10-K   —   SEA’34

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   2.39M 
 2: EX-21       Subsidiaries List                                   HTML     34K 
 3: EX-23       Consent of Expert or Counsel                        HTML     30K 
 8: EX-97       Clawback Policy re: Recovery of Erroneously         HTML     44K 
                Awarded Compensation                                             
 4: EX-31.1     Certification -- §302 - SOA'02                      HTML     35K 
 5: EX-31.2     Certification -- §302 - SOA'02                      HTML     35K 
 6: EX-32.1     Certification -- §906 - SOA'02                      HTML     32K 
 7: EX-32.2     Certification -- §906 - SOA'02                      HTML     32K 
14: R1          Audit Information                                   HTML     36K 
15: R2          Cover                                               HTML     94K 
16: R3          Document And Entity Information (Details)           HTML     33K 
17: R4          Consolidated Balance Sheets                         HTML    164K 
18: R5          Consolidated Balance Sheets (Parenthetical)         HTML     41K 
19: R6          Consolidated Statements Of Income                   HTML    107K 
20: R7          Consolidated Statements Of Comprehensive Income     HTML     70K 
                (Loss)                                                           
21: R8          Consolidated Statements Of Comprehensive Income     HTML     43K 
                (Loss) (Parenthetical)                                           
22: R9          Consolidated Statements Of Cash Flows               HTML    129K 
23: R10         Consolidated Statements Of Shareholders' Equity     HTML    100K 
24: R11         Consolidated Statements Of Shareholders' Equity     HTML     33K 
                (Parenthetical)                                                  
25: R12         Summary Of Significant Accounting Policies          HTML    158K 
26: R13         Accounts And Other Receivables                      HTML     54K 
27: R14         Inventories                                         HTML     41K 
28: R15         Leases, Codification Topic 842                      HTML     49K 
29: R16         Goodwill And Other Intangible Assets                HTML     64K 
30: R17         Accrued Expenses                                    HTML     49K 
31: R18         Debt And Credit Agreements                          HTML     65K 
32: R19         Retirement Plans And Other Postretirement Benefits  HTML    190K 
33: R20         Other Income (Expense), Net (Notes)                 HTML     48K 
34: R21         Financial Instruments                               HTML    103K 
35: R22         Stock Option And Stock Award Plans                  HTML    164K 
36: R23         Income Taxes                                        HTML    177K 
37: R24         Business Segments                                   HTML    194K 
38: R25         Savings Plan                                        HTML     35K 
39: R26         Supply Chain Financing                              HTML     38K 
40: R27         Contingencies                                       HTML     36K 
41: R28         Summary Of Significant Accounting Policies          HTML    141K 
                (Policies)                                                       
42: R29         Summary Of Significant Accounting Policies          HTML    100K 
                (Tables)                                                         
43: R30         Accounts And Other Receivables (Tables)             HTML     56K 
44: R31         Inventories (Tables)                                HTML     42K 
45: R32         Leases, Codification Topic 842 (Tables)             HTML     50K 
46: R33         Goodwill And Other Intangible Assets (Tables)       HTML     69K 
47: R34         Accrued Expenses (Tables)                           HTML     49K 
48: R35         Debt And Credit Agreements (Tables)                 HTML     52K 
49: R36         Retirement Plans And Other Postretirement Benefits  HTML    189K 
                (Tables)                                                         
50: R37         Other Income and Expenses (Tables)                  HTML     47K 
51: R38         Financial Instruments (Tables)                      HTML    104K 
52: R39         Stock Option And Stock Award Plans (Tables)         HTML    160K 
53: R40         Income Taxes (Tables)                               HTML    174K 
54: R41         Business Segments (Tables)                          HTML    199K 
55: R42         Summary Of Significant Accounting Policies          HTML    110K 
                (Narrative) (Details).                                           
56: R43         Summary Of Significant Accounting Policies          HTML     40K 
                (Schedule Of Diluted Earnings Per Share Computed                 
                Using Weighted Average Common And Potentially                    
                Dilutive Common Equivalent Shares Outstanding)                   
                (Details)                                                        
57: R44         Summary of Significant Accounting Policies          HTML    147K 
                (Schedule of Accumulated Other Comprehensive                     
                Income (Loss)) (Details)                                         
58: R45         Summary Of Significant Accounting Policies          HTML     40K 
                (Details)                                                        
59: R46         Accounts And Other Receivables (Schedule Of         HTML     43K 
                Accounts And Other Receivable) (Details)                         
60: R47         Accounts And Other Receivables (Schedule Of         HTML     44K 
                Reconciliation Of The Beginning And Ending                       
                Balances Of The Allowance For Doubtful Accounts                  
                And Sales Returns) (Details)                                     
61: R48         Inventories (Narrative) (Details)                   HTML     39K 
62: R49         Inventories (Schedule Of Inventories) (Details)     HTML     42K 
63: R50         Leases, Codification Topic 842 (Details)            HTML     59K 
64: R51         Goodwill And Other Intangible Assets (Narrative)    HTML     33K 
                (Details)                                                        
65: R52         Goodwill And Other Intangible Assets (Schedule Of   HTML     43K 
                Goodwill And Other Intangibles) (Details)                        
66: R53         Goodwill And Other Intangible Assets                HTML     47K 
                (Reconciliation Of The Beginning And Ending                      
                Balance Of Goodwill) (Details)                                   
67: R54         Accrued Expenses (Schedule Of Accrued Expenses)     HTML     58K 
                (Details)                                                        
68: R55         Debt And Credit Agreements (Narrative) (Details)    HTML     74K 
69: R56         Debt And Credit Agreements (Schedule Of Borrowings  HTML     44K 
                Under Credit Agreement At Various Indebtedness To                
                Adjusted EBITDA Levels) (Details)                                
70: R57         Debt And Credit Agreements (Summary Of Total Debt   HTML     68K 
                Due And Outstanding) (Details)                                   
71: R58         Retirement Plans And Other Postretirement Benefits  HTML     69K 
                (Narrative) (Details)                                            
72: R59         Retirement Plans And Other Postretirement Benefits  HTML    108K 
                (Reconciliation Of Changes In Benefit Obligations                
                And Plan Assets) (Details)                                       
73: R60         Retirement Plans And Other Postretirement Benefits  HTML     79K 
                (Components Of Net Periodic Benefit Income Or Cost               
                For Continuing Operations) (Details)                             
74: R61         Retirement Plans And Other Postretirement Benefits  HTML     49K 
                (Schedule Of Expected Benefit Payments For                       
                Continuing Operations) (Details)                                 
75: R62         Retirement Plans And Other Postretirement Benefits  HTML     38K 
                (Schedule Of Amounts Recognized Before Related                   
                Deferred Income Taxes In Accumulated Other                       
                Comprehensive Income) (Details)                                  
76: R63         Retirement Plans And Other Postretirement Benefits  HTML     42K 
                (Schedule Of Percentage Composition Of Assets Held               
                By Pension Plans) (Details)                                      
77: R64         Retirement Plans And Other Postretirement Benefits  HTML     70K 
                (Schedule Of Pension Plan Assets Categorized By                  
                Level Within Fair Value Measurement Hierarchy)                   
                (Details)                                                        
78: R65         Other Income (Expense), Net (Details)               HTML     48K 
79: R66         Financial Instruments (Narrative) (Details)         HTML     41K 
80: R67         Financial Instruments (Summary Of Location And      HTML     49K 
                Fair Value Of Derivative Financial Instruments)                  
                (Details)                                                        
81: R68         Financial Instruments Financial Instruments         HTML     72K 
                (Summary of Location and Fair Value of Currency                  
                Forward Derivative Financial Instruments -                       
                Terphane (Details).                                              
82: R69         Financial Instruments Financial Instruments         HTML     49K 
                (Summary of Location and Fair Value of Currency                  
                Forward Derivative Financial Instruments (Details)               
83: R70         Financial Instruments (Schedule Of Pretax Effect    HTML     54K 
                On Net Income (Loss) And Other Comprehensive                     
                Income (Loss) Of Derivative Instruments Classified               
                As Cash Flow Hedges) (Details)                                   
84: R71         Stock Option And Stock Award Plans (Narrative)      HTML     53K 
                (Details)                                                        
85: R72         Stock Option And Stock Award Plans (Summary Of      HTML     70K 
                Stock Options Outstanding) (Details)                             
86: R73         Stock Option And Stock Award Plans (Summary of      HTML     49K 
                Assumptions) (Details)                                           
87: R74         Stock Option And Stock Award Plans (Summary Of      HTML     67K 
                Additional Information On Stock Options                          
                Outstanding And Exercisable) (Details)                           
88: R75         Stock Option And Stock Award Plans (Summary Of      HTML     78K 
                Additional Information On Non-Vested Restricted                  
                Stock Outstanding) (Details)                                     
89: R76         Stock Option And Stock Award Plans (Summary of      HTML     66K 
                SARs) (Details)                                                  
90: R77         Income Taxes (Narrative) (Details)                  HTML     72K 
91: R78         Income Taxes (Schedule Of Income From Continuing    HTML     71K 
                Operations Before Income Taxes) (Details)                        
92: R79         Income Taxes (Summary of Effective Income Tax Rate  HTML    106K 
                For Continuing Operations) (Details)                             
93: R80         Income Taxes (Schedule Of Deferred Tax Liabilities  HTML     81K 
                And Assets) (Details)                                            
94: R81         Income Taxes (Schedule Of Unrecognized Uncertain    HTML     41K 
                Tax Positions) (Details)                                         
95: R82         Income Taxes (Schedule Of Additional Information    HTML     49K 
                Related To Unrecognized Uncertain Tax Positions)                 
                (Details)                                                        
96: R83         Business Segments (Narrative) (Details)             HTML     42K 
97: R84         Business Segments (Schedule Of Segment Reporting    HTML     99K 
                Information By Segment) (Details)                                
98: R85         Business Segments (Schedule Of Identifiable         HTML     59K 
                Assets) (Details)                                                
99: R86         Business Segments (Schedule Of Depreciation And     HTML     51K 
                Amortization, Capital Expenditures) (Details)                    
100: R87         Business Segments (Schedule Of Net Sales By         HTML     49K  
                Geographic Area) (Details)                                       
101: R88         Business Segments (Schedule Of Identifiable Assets  HTML     59K  
                By Geographic Area, Property, Plant & Equipment,                 
                Net By Geographic Area) (Details)                                
102: R89         Business Segments (Schedule Of Net Sales By         HTML     69K  
                Product Group) (Details)                                         
103: R90         Savings Plan (Details)                              HTML     50K  
104: R91         Supply Chain Financing - (Narrative) (Details)      HTML     42K  
106: XML         IDEA XML File -- Filing Summary                      XML    211K  
109: XML         XBRL Instance -- tg-20231231_htm                     XML   3.53M  
105: EXCEL       IDEA Workbook of Financial Report Info              XLSX    223K  
10: EX-101.CAL  XBRL Calculations -- tg-20231231_cal                 XML    240K 
11: EX-101.DEF  XBRL Definitions -- tg-20231231_def                  XML    995K 
12: EX-101.LAB  XBRL Labels -- tg-20231231_lab                       XML   2.45M 
13: EX-101.PRE  XBRL Presentations -- tg-20231231_pre                XML   1.55M 
 9: EX-101.SCH  XBRL Schema -- tg-20231231                           XSD    302K 
107: JSON        XBRL Instance as JSON Data -- MetaLinks              667±  1.05M  
108: ZIP         XBRL Zipped Folder -- 0000850429-24-000004-xbrl      Zip   1.50M  


‘EX-101.DEF’   —   XBRL Definitions — tg-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:7c8c4522-d446-4134-a2dd-44b8f055a20b,g:478ea043-c865-4177-b776-d6aa210302de -->
<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.tredegar.com/role/ConsolidatedStatementsOfIncome" xlink:type="simple" xlink:href="tg-20231231.xsd#ConsolidatedStatementsOfIncome"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/ConsolidatedStatementsOfIncome" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" 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_ba4cadb1-9f32-4e08-b619-63047cb610e9" 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_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_StatementTable_ba4cadb1-9f32-4e08-b619-63047cb610e9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e8718b59-ab4a-4dd5-b861-21d03c012c00" 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_StatementTable_ba4cadb1-9f32-4e08-b619-63047cb610e9" xlink:to="loc_srt_ProductOrServiceAxis_e8718b59-ab4a-4dd5-b861-21d03c012c00" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e8718b59-ab4a-4dd5-b861-21d03c012c00_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_e8718b59-ab4a-4dd5-b861-21d03c012c00" xlink:to="loc_srt_ProductsAndServicesDomain_e8718b59-ab4a-4dd5-b861-21d03c012c00_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e91a0fc7-e0d6-4185-911c-7a333f2985c4" 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_e8718b59-ab4a-4dd5-b861-21d03c012c00" xlink:to="loc_srt_ProductsAndServicesDomain_e91a0fc7-e0d6-4185-911c-7a333f2985c4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_2d7de480-d858-4d0f-b17b-31186cd204a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProductAndServiceOtherMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e91a0fc7-e0d6-4185-911c-7a333f2985c4" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_2d7de480-d858-4d0f-b17b-31186cd204a8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShippingAndHandlingMember_20f172c8-7901-494e-8080-70aa2cd1e428" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShippingAndHandlingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e91a0fc7-e0d6-4185-911c-7a333f2985c4" xlink:to="loc_us-gaap_ShippingAndHandlingMember_20f172c8-7901-494e-8080-70aa2cd1e428" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_4295ec10-a0d1-4fe8-88ec-ac954ada13a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_RevenuesAbstract_4295ec10-a0d1-4fe8-88ec-ac954ada13a2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GrossSales_caa0eea6-990c-497c-9585-9715c6af915f" xlink:href="tg-20231231.xsd#tg_GrossSales"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4295ec10-a0d1-4fe8-88ec-ac954ada13a2" xlink:to="loc_tg_GrossSales_caa0eea6-990c-497c-9585-9715c6af915f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_7d078c79-29d8-4dc2-b56a-0cd760b8a769" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonoperatingIncomeExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4295ec10-a0d1-4fe8-88ec-ac954ada13a2" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_7d078c79-29d8-4dc2-b56a-0cd760b8a769" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TotalRevenuesNetOfOtherExpenses_a58e3a3d-368d-4bee-9e55-b7f03db5d46e" xlink:href="tg-20231231.xsd#tg_TotalRevenuesNetOfOtherExpenses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4295ec10-a0d1-4fe8-88ec-ac954ada13a2" xlink:to="loc_tg_TotalRevenuesNetOfOtherExpenses_a58e3a3d-368d-4bee-9e55-b7f03db5d46e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfRevenueAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_13e0ea57-a308-4eb9-90cf-85acbbf83389" 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_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_13e0ea57-a308-4eb9-90cf-85acbbf83389" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8206b8eb-6ed2-4fb1-a9ad-58e27ecda7a9" 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_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8206b8eb-6ed2-4fb1-a9ad-58e27ecda7a9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_cacef34f-0c5e-4d8d-a8d9-208646a269e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_cacef34f-0c5e-4d8d-a8d9-208646a269e2" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_ffd9dfac-cb00-4385-a763-bcd1058edec9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_ffd9dfac-cb00-4385-a763-bcd1058edec9" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitExpense_25a628d2-37a3-45eb-a451-95b98d251276" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitExpense_25a628d2-37a3-45eb-a451-95b98d251276" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpense_b35c18d7-736b-4415-8f86-1ad873c8b811" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestAndDebtExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_InterestAndDebtExpense_b35c18d7-736b-4415-8f86-1ad873c8b811" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivities_9a214f2c-8cdd-4adb-9d7a-00ba155ac1a6" xlink:href="tg-20231231.xsd#tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivities_9a214f2c-8cdd-4adb-9d7a-00ba155ac1a6" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PreTaxActuarialLossForPensionSettlement_35d0ee15-92d4-45d7-92b8-17b79b8e782e" xlink:href="tg-20231231.xsd#tg_PreTaxActuarialLossForPensionSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_tg_PreTaxActuarialLossForPensionSettlement_35d0ee15-92d4-45d7-92b8-17b79b8e782e" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_a7c33002-efb2-4c1a-a9c7-66251c5a2f13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_a7c33002-efb2-4c1a-a9c7-66251c5a2f13" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_2d9d6199-4556-47ea-b255-107006b374d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostsAndExpenses"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_42f26d14-3be6-4672-8273-2ed08957ffa2" xlink:to="loc_us-gaap_CostsAndExpenses_2d9d6199-4556-47ea-b255-107006b374d5" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_860e0532-4173-4099-931f-bfef0afe6cf9" 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_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_860e0532-4173-4099-931f-bfef0afe6cf9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_c81852cb-73ea-4b7d-94ed-d24112e27dc4" 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_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_c81852cb-73ea-4b7d-94ed-d24112e27dc4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_37820d0d-8bab-4fa5-ba03-961eedba7a28" 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_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_NetIncomeLoss_37820d0d-8bab-4fa5-ba03-961eedba7a28" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_86781aff-f14d-4662-a2d6-6dbdcb5922dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9dae35a6-5c64-41a9-b342-a019ca94d317" xlink:to="loc_us-gaap_EarningsPerShareAbstract_86781aff-f14d-4662-a2d6-6dbdcb5922dc" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_5eeb3181-aa81-4d4d-99ac-0508dd1c8873" 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_EarningsPerShareAbstract_86781aff-f14d-4662-a2d6-6dbdcb5922dc" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_5eeb3181-aa81-4d4d-99ac-0508dd1c8873" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_c07d2a17-f12b-491a-8d98-1ed8a3239e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5eeb3181-aa81-4d4d-99ac-0508dd1c8873" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_c07d2a17-f12b-491a-8d98-1ed8a3239e0e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_5b9ff42f-b76c-43c6-85c7-7a77693982f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5eeb3181-aa81-4d4d-99ac-0508dd1c8873" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_5b9ff42f-b76c-43c6-85c7-7a77693982f9" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_77ec8ded-3c4b-45c2-9ba1-c57de500a68b" 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_EarningsPerShareAbstract_86781aff-f14d-4662-a2d6-6dbdcb5922dc" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_77ec8ded-3c4b-45c2-9ba1-c57de500a68b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_a46330ce-7591-4b5f-95a9-f83b189a47d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesIssuedBasic"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_77ec8ded-3c4b-45c2-9ba1-c57de500a68b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_a46330ce-7591-4b5f-95a9-f83b189a47d9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_7ff3255e-aa5a-43b2-a9ee-b224132cc213" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_77ec8ded-3c4b-45c2-9ba1-c57de500a68b" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_7ff3255e-aa5a-43b2-a9ee-b224132cc213" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:type="simple" xlink:href="tg-20231231.xsd#ConsolidatedStatementsOfShareholdersEquity"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_88282477-de10-4545-abae-6dc33f988246" 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_29bc8a60-461b-407d-aecb-d7c5b9a38191" 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_88282477-de10-4545-abae-6dc33f988246" xlink:to="loc_us-gaap_StatementTable_29bc8a60-461b-407d-aecb-d7c5b9a38191" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1deecb83-e8db-4760-9fd7-245898637ff8" 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_29bc8a60-461b-407d-aecb-d7c5b9a38191" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1deecb83-e8db-4760-9fd7-245898637ff8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1deecb83-e8db-4760-9fd7-245898637ff8_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_1deecb83-e8db-4760-9fd7-245898637ff8" xlink:to="loc_us-gaap_EquityComponentDomain_1deecb83-e8db-4760-9fd7-245898637ff8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" 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_1deecb83-e8db-4760-9fd7-245898637ff8" xlink:to="loc_us-gaap_EquityComponentDomain_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_2eff99a8-bef4-46fa-b9b4-39f3897a0ea8" 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_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" xlink:to="loc_us-gaap_CommonStockMember_2eff99a8-bef4-46fa-b9b4-39f3897a0ea8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_16499486-9fab-4c8b-8829-ae3ecf29ffd8" 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_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" xlink:to="loc_us-gaap_RetainedEarningsMember_16499486-9fab-4c8b-8829-ae3ecf29ffd8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TrustForSavingRestorationPlanMember_98621601-6af7-4975-872f-ed42494bbd66" xlink:href="tg-20231231.xsd#tg_TrustForSavingRestorationPlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" xlink:to="loc_tg_TrustForSavingRestorationPlanMember_98621601-6af7-4975-872f-ed42494bbd66" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_93bbd48b-b4ed-4871-8d88-419314eecb1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c49cd601-f9d4-43f8-a190-5c1ba7e4ba80" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_93bbd48b-b4ed-4871-8d88-419314eecb1f" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" 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_88282477-de10-4545-abae-6dc33f988246" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_130e7d27-0122-494e-86c0-7f3634620cab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_SharesIssued_130e7d27-0122-494e-86c0-7f3634620cab" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2d9062dc-2e86-43ab-bec5-a899604a3e92" 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_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_StockholdersEquity_2d9062dc-2e86-43ab-bec5-a899604a3e92" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_6bae5ec8-feae-4090-8ce6-f25095394eab" 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_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_NetIncomeLoss_6bae5ec8-feae-4090-8ce6-f25095394eab" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_28ee384a-055c-41ea-b4f1-77074f75cc48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_28ee384a-055c-41ea-b4f1-77074f75cc48" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDerivativeFinancialInstrumentsAdjustment_c8977208-c940-4aa7-a52b-8be8ab921254" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDerivativeFinancialInstrumentsAdjustment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_OtherComprehensiveIncomeLossDerivativeFinancialInstrumentsAdjustment_c8977208-c940-4aa7-a52b-8be8ab921254" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_499ba7e9-f3f2-4c18-a57b-4cef682fb0ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_499ba7e9-f3f2-4c18-a57b-4cef682fb0ed" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_90ba4104-faca-449b-a8f8-74efa31b3576" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_90ba4104-faca-449b-a8f8-74efa31b3576" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PostTaxActuarialLossForPensionSettlement_1b52f1bf-d7db-4eff-90fc-4d83bb95ede3" xlink:href="tg-20231231.xsd#tg_PostTaxActuarialLossForPensionSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_PostTaxActuarialLossForPensionSettlement_1b52f1bf-d7db-4eff-90fc-4d83bb95ede3" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_74e48c4e-167a-453c-8c61-5f0673f8ee9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsCommonStockCash"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_DividendsCommonStockCash_74e48c4e-167a-453c-8c61-5f0673f8ee9d" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_7f0c7da3-901b-4362-94dd-759bdc13c4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_7f0c7da3-901b-4362-94dd-759bdc13c4d1" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationExpenseValue_fe0c3fb2-8400-45c1-80d9-75d0d3eee2eb" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationExpenseValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_ShareBasedCompensationExpenseValue_fe0c3fb2-8400-45c1-80d9-75d0d3eee2eb" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_61f6c8e0-a467-4bdb-b6bd-7d94b66af3a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_61f6c8e0-a467-4bdb-b6bd-7d94b66af3a9" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_07392d54-de38-4c53-a82b-b059ea421928" 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_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_07392d54-de38-4c53-a82b-b059ea421928" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares_4170e8f3-bd27-4855-91f6-8dde3b4fe181" xlink:href="tg-20231231.xsd#tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactionsShares_4170e8f3-bd27-4855-91f6-8dde3b4fe181" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions_8804bf77-b43d-4c23-aad9-1259a18a3b62" xlink:href="tg-20231231.xsd#tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions_8804bf77-b43d-4c23-aad9-1259a18a3b62" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan_f6fdad41-0706-4ca9-b20e-ac35327be7e1" xlink:href="tg-20231231.xsd#tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_d2014a59-6481-4d47-b1a3-92391a8f4e1e" xlink:to="loc_tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan_f6fdad41-0706-4ca9-b20e-ac35327be7e1" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_d83a4bc0-e429-4eec-8359-96b362f1c49c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_bda61170-a479-43be-a453-1898b9686aba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#SummaryOfSignificantAccountingPoliciesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:href="tg-20231231.xsd#tg_SummaryOfSignificantAccountingPoliciesLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:href="tg-20231231.xsd#tg_SummaryOfSignificantAccountingPoliciesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e" 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_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e_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_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_bda0f423-fbd3-4d25-a085-10ffa0561d0f" 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_9e3ac9cf-f8af-4901-9990-b91a18ceeb9e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_bda0f423-fbd3-4d25-a085-10ffa0561d0f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_7a0c0209-f71b-4fe8-b79c-572d2dd0fa58" 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_bda0f423-fbd3-4d25-a085-10ffa0561d0f" xlink:to="loc_us-gaap_ForeignCountryMember_7a0c0209-f71b-4fe8-b79c-572d2dd0fa58" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_868b4100-17a6-400b-a54a-d658be139021" 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_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_srt_RangeAxis_868b4100-17a6-400b-a54a-d658be139021" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_868b4100-17a6-400b-a54a-d658be139021_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_868b4100-17a6-400b-a54a-d658be139021" xlink:to="loc_srt_RangeMember_868b4100-17a6-400b-a54a-d658be139021_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d4ba5285-1c78-49d6-a501-ea05a346afee" 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_868b4100-17a6-400b-a54a-d658be139021" xlink:to="loc_srt_RangeMember_d4ba5285-1c78-49d6-a501-ea05a346afee" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_87feaa07-31aa-4f10-a4f3-0debe7148e02" 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_d4ba5285-1c78-49d6-a501-ea05a346afee" xlink:to="loc_srt_MinimumMember_87feaa07-31aa-4f10-a4f3-0debe7148e02" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8a298314-11f6-4196-b89a-c21078b7ff1e" 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_d4ba5285-1c78-49d6-a501-ea05a346afee" xlink:to="loc_srt_MaximumMember_8a298314-11f6-4196-b89a-c21078b7ff1e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5" 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_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5_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_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9071a678-b557-41ad-a9ac-df105680d363" 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_fb90f6b4-9a35-4495-8b7f-b8e4a36b61e5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9071a678-b557-41ad-a9ac-df105680d363" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_1b6d2691-dccd-4f54-9917-ac01ec025279" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandAndBuildingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9071a678-b557-41ad-a9ac-df105680d363" xlink:to="loc_us-gaap_LandAndBuildingMember_1b6d2691-dccd-4f54-9917-ac01ec025279" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_c1521c59-18b3-455a-acc4-e022bf371b8e" 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_9071a678-b557-41ad-a9ac-df105680d363" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_c1521c59-18b3-455a-acc4-e022bf371b8e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitAxis_10685a13-c153-44cf-bd13-98af9ab4391a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_ReportingUnitAxis_10685a13-c153-44cf-bd13-98af9ab4391a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_10685a13-c153-44cf-bd13-98af9ab4391a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReportingUnitAxis_10685a13-c153-44cf-bd13-98af9ab4391a" xlink:to="loc_us-gaap_ReportingUnitDomain_10685a13-c153-44cf-bd13-98af9ab4391a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitDomain_e39c76db-3305-4656-9950-93e772446621" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReportingUnitAxis_10685a13-c153-44cf-bd13-98af9ab4391a" xlink:to="loc_us-gaap_ReportingUnitDomain_e39c76db-3305-4656-9950-93e772446621" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SurfaceProtectionFilmsMember_c4e5970b-d309-4bc9-a091-84ce8a8a8a8c" xlink:href="tg-20231231.xsd#tg_SurfaceProtectionFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReportingUnitDomain_e39c76db-3305-4656-9950-93e772446621" xlink:to="loc_tg_SurfaceProtectionFilmsMember_c4e5970b-d309-4bc9-a091-84ce8a8a8a8c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_d9885f63-db12-4547-b177-e3a810c2c281" 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_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_dei_LegalEntityAxis_d9885f63-db12-4547-b177-e3a810c2c281" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_d9885f63-db12-4547-b177-e3a810c2c281_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_d9885f63-db12-4547-b177-e3a810c2c281" xlink:to="loc_dei_EntityDomain_d9885f63-db12-4547-b177-e3a810c2c281_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_617381fd-f41d-42e3-8b85-71329c23bfe3" 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_d9885f63-db12-4547-b177-e3a810c2c281" xlink:to="loc_dei_EntityDomain_617381fd-f41d-42e3-8b85-71329c23bfe3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SurfaceProtectionFilmsMember_bd602827-e90e-4633-aa41-f2fbace8f31d" xlink:href="tg-20231231.xsd#tg_SurfaceProtectionFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_617381fd-f41d-42e3-8b85-71329c23bfe3" xlink:to="loc_tg_SurfaceProtectionFilmsMember_bd602827-e90e-4633-aa41-f2fbace8f31d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NatureOfExpenseAxis_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NatureOfExpenseAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_NatureOfExpenseAxis_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NatureOfExpenseAxis_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_a6e45ff9-eae6-4d59-be5b-0c2f4eeba9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NatureOfExpenseAxis_fd36dc6f-1ccd-4706-8f10-13e5b7bc996f" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_a6e45ff9-eae6-4d59-be5b-0c2f4eeba9f8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_9ca88739-a93a-493b-8343-6587b5ece7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_a6e45ff9-eae6-4d59-be5b-0c2f4eeba9f8" xlink:to="loc_us-gaap_EmployeeSeveranceMember_9ca88739-a93a-493b-8343-6587b5ece7dc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenseMember_e738fff1-81e9-45ed-b483-11e06bc662f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherExpenseMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_a6e45ff9-eae6-4d59-be5b-0c2f4eeba9f8" xlink:to="loc_us-gaap_OtherExpenseMember_e738fff1-81e9-45ed-b483-11e06bc662f5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_d2687385-8298-49d6-8c88-35d1dfd96824" 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_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_d2687385-8298-49d6-8c88-35d1dfd96824" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_d2687385-8298-49d6-8c88-35d1dfd96824_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_d2687385-8298-49d6-8c88-35d1dfd96824" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_d2687385-8298-49d6-8c88-35d1dfd96824_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8411e060-c967-47e6-b44c-db10f6a1b838" 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_d2687385-8298-49d6-8c88-35d1dfd96824" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8411e060-c967-47e6-b44c-db10f6a1b838" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_30d05827-0abd-490d-a44b-e140cf01d59a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8411e060-c967-47e6-b44c-db10f6a1b838" xlink:to="loc_us-gaap_EmployeeSeveranceMember_30d05827-0abd-490d-a44b-e140cf01d59a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AssetImpairmentMember_bf977675-4a90-4986-a681-e7839b824457" xlink:href="tg-20231231.xsd#tg_AssetImpairmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8411e060-c967-47e6-b44c-db10f6a1b838" xlink:to="loc_tg_AssetImpairmentMember_bf977675-4a90-4986-a681-e7839b824457" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_6f15c750-838a-4a2a-9d15-9037788727c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherRestructuringMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8411e060-c967-47e6-b44c-db10f6a1b838" xlink:to="loc_us-gaap_OtherRestructuringMember_6f15c750-838a-4a2a-9d15-9037788727c1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_12e52596-a257-42ca-919d-43fcbcf1b61a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_RestructuringPlanAxis_12e52596-a257-42ca-919d-43fcbcf1b61a" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_12e52596-a257-42ca-919d-43fcbcf1b61a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_12e52596-a257-42ca-919d-43fcbcf1b61a" xlink:to="loc_us-gaap_RestructuringPlanDomain_12e52596-a257-42ca-919d-43fcbcf1b61a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_6c2d1518-aa92-497d-b4dc-7e1adbfbc7d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_12e52596-a257-42ca-919d-43fcbcf1b61a" xlink:to="loc_us-gaap_RestructuringPlanDomain_6c2d1518-aa92-497d-b4dc-7e1adbfbc7d4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ClosureOfPEFilmsTechnicalCenterMember_a68c318b-0c02-4984-9080-e2d31b0438f4" xlink:href="tg-20231231.xsd#tg_ClosureOfPEFilmsTechnicalCenterMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_6c2d1518-aa92-497d-b4dc-7e1adbfbc7d4" xlink:to="loc_tg_ClosureOfPEFilmsTechnicalCenterMember_a68c318b-0c02-4984-9080-e2d31b0438f4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesTable_ecdb5e7e-749c-487e-a7c4-729a9931b38d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee" xlink:to="loc_us-gaap_SegmentDomain_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c4f62323-4385-40f0-a6e5-2d0d4d0ed828" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6bfb6507-b4af-41fe-b7a2-188bed8dd6ee" xlink:to="loc_us-gaap_SegmentDomain_c4f62323-4385-40f0-a6e5-2d0d4d0ed828" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_56799962-1d9b-4f4a-b49a-3c01b2280e5f" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c4f62323-4385-40f0-a6e5-2d0d4d0ed828" xlink:to="loc_tg_AluminumExtrusionsMember_56799962-1d9b-4f4a-b49a-3c01b2280e5f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5f433e3f-fa8a-41e8-8e2f-eadc83501d5c" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5f433e3f-fa8a-41e8-8e2f-eadc83501d5c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_61245ebe-dc1e-440f-862c-341e2b9da09b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Cash"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_Cash_61245ebe-dc1e-440f-862c-341e2b9da09b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_33b79032-430e-4dae-935b-18f29a3664b3" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_33b79032-430e-4dae-935b-18f29a3664b3" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_157499a8-40fd-4375-af1d-8079cd7696b9" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_157499a8-40fd-4375-af1d-8079cd7696b9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_3afb6fed-51c2-4d21-be65-82265fd859be" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_Goodwill_3afb6fed-51c2-4d21-be65-82265fd859be" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_40d2c3c8-b258-48a0-9fd2-77e542d110f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_40d2c3c8-b258-48a0-9fd2-77e542d110f3" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLossNetOfTax_09ad7887-67cb-4232-a2ba-3ab827ffa798" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLossNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_GoodwillImpairmentLossNetOfTax_09ad7887-67cb-4232-a2ba-3ab827ffa798" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_f7f99295-cb0e-4f98-864c-b68a0ca5842e" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_f7f99295-cb0e-4f98-864c-b68a0ca5842e" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessExitCosts1_192af61a-0d62-425d-a3e8-b1f073c56b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessExitCosts1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_BusinessExitCosts1_192af61a-0d62-425d-a3e8-b1f073c56b5c" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_0461e9fb-0b4e-4032-83bf-01923f84b191" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_AssetImpairmentCharges_0461e9fb-0b4e-4032-83bf-01923f84b191" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_42782a69-10a0-4314-b942-c5d0034eddfd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserveAcceleratedDepreciation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_RestructuringReserveAcceleratedDepreciation_42782a69-10a0-4314-b942-c5d0034eddfd" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnTerminationOfLease_67beb23a-f23f-4a13-a8f5-a66ff18dd6f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnTerminationOfLease"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_GainLossOnTerminationOfLease_67beb23a-f23f-4a13-a8f5-a66ff18dd6f0" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_949ca6dd-a0e0-4add-a786-433dfc9f9eb5" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_RestructuringReserve_949ca6dd-a0e0-4add-a786-433dfc9f9eb5" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_87b65765-ab5e-4fe2-8724-f5a7cee7d153" 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_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_RestructuringCharges_87b65765-ab5e-4fe2-8724-f5a7cee7d153" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_58aac56b-614a-448a-88c4-11da61d99a80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRestructuring"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_us-gaap_PaymentsForRestructuring_58aac56b-614a-448a-88c4-11da61d99a80" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_RestructuringReserveChargesAgainstAssets_0db95fd3-b4d7-4543-9ae9-23046772d08f" xlink:href="tg-20231231.xsd#tg_RestructuringReserveChargesAgainstAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SummaryOfSignificantAccountingPoliciesLineItems_bd61fc96-02dc-49ae-8a41-b3a907d92d00" xlink:to="loc_tg_RestructuringReserveChargesAgainstAssets_0db95fd3-b4d7-4543-9ae9-23046772d08f" xlink:type="arc" order="15"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/SummaryofSignificantAccountingPoliciesScheduleofAccumulatedOtherComprehensiveIncomelossDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#SummaryofSignificantAccountingPoliciesScheduleofAccumulatedOtherComprehensiveIncomelossDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/SummaryofSignificantAccountingPoliciesScheduleofAccumulatedOtherComprehensiveIncomelossDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_9460a627-f64d-44e0-9155-1e439232b89c" 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_4472b922-dddb-448e-847e-35ef1687f725" 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_9460a627-f64d-44e0-9155-1e439232b89c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_4472b922-dddb-448e-847e-35ef1687f725" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf" 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_4472b922-dddb-448e-847e-35ef1687f725" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf_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_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf" xlink:to="loc_us-gaap_EquityComponentDomain_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" 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_1dcfe3f8-02b8-47a2-8874-e8963dbcd4bf" xlink:to="loc_us-gaap_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_508de1a7-ae40-4279-8738-03d89ebe4659" 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_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_508de1a7-ae40-4279-8738-03d89ebe4659" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_e65aeaf0-975a-496b-9f35-40cf975abc95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_e65aeaf0-975a-496b-9f35-40cf975abc95" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PensionAndOtherPostretirementBenefitAdjustMember_ba5773d8-a538-43c0-b32f-dc8bcd9c202f" xlink:href="tg-20231231.xsd#tg_PensionAndOtherPostretirementBenefitAdjustMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" xlink:to="loc_tg_PensionAndOtherPostretirementBenefitAdjustMember_ba5773d8-a538-43c0-b32f-dc8bcd9c202f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_a8904249-9527-4cef-bd41-bcedc60aa81e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_cb2d25e1-ff7c-426d-86c2-dbb79ece5857" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_a8904249-9527-4cef-bd41-bcedc60aa81e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" 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_9460a627-f64d-44e0-9155-1e439232b89c" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b1771652-02f6-4d78-a069-17376f8f1e39" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_b1771652-02f6-4d78-a069-17376f8f1e39" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_796a8966-9e56-4377-bf90-3c5e26b6a4a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_796a8966-9e56-4377-bf90-3c5e26b6a4a5" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_5eb2c801-2aec-41c6-b420-48fbe03f7ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_5eb2c801-2aec-41c6-b420-48fbe03f7ee4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationGainLossAfterReclassificationAfterTax_51858949-a7aa-46a5-a579-356ec11deca9" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationGainLossAfterReclassificationAfterTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationGainLossAfterReclassificationAfterTax_51858949-a7aa-46a5-a579-356ec11deca9" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3e9b8c3e-9cd3-49b2-9223-f48938a255d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3e9b8c3e-9cd3-49b2-9223-f48938a255d6" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fcb570d5-86dd-4a5f-b50d-8a6e86f5d105" 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_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_StockholdersEquity_fcb570d5-86dd-4a5f-b50d-8a6e86f5d105" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_84a1369c-ded7-4cfb-bb33-58ffbc7f861f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_84a1369c-ded7-4cfb-bb33-58ffbc7f861f" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationBeforeTax_e1555b30-eedc-4354-93f0-0e758dc828f3" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationBeforeTax_e1555b30-eedc-4354-93f0-0e758dc828f3" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_24a89b11-2156-41d4-839a-72e253eca902" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_24a89b11-2156-41d4-839a-72e253eca902" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_77fd0572-481f-474d-ac56-c6c6ab57b4f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_77fd0572-481f-474d-ac56-c6c6ab57b4f5" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_ecd3e468-3cb2-4a3f-a658-9f7db1a76788" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_ecd3e468-3cb2-4a3f-a658-9f7db1a76788" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationTax_44c2ce29-75bb-4cc5-804d-cbff247fa0c2" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationTax_44c2ce29-75bb-4cc5-804d-cbff247fa0c2" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_7c47c872-26db-4a11-8690-650f5f99cc3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_7c47c872-26db-4a11-8690-650f5f99cc3c" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_a8be0546-17e8-4816-aa26-742212849a54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_a8be0546-17e8-4816-aa26-742212849a54" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_a2f4f1c6-4e3b-44d5-b206-f779164044f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_a2f4f1c6-4e3b-44d5-b206-f779164044f5" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationAfterTax_ed3b33a8-cf27-4504-9987-4de986c23c48" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationAfterTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeReclassificationAfterTax_ed3b33a8-cf27-4504-9987-4de986c23c48" xlink:type="arc" order="16"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_f2416bf0-ab81-4fb6-95f3-5f7a90583ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_f2416bf0-ab81-4fb6-95f3-5f7a90583ba1" xlink:type="arc" order="17"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_73413ec5-65c1-4734-ad8d-72e021152a19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_73413ec5-65c1-4734-ad8d-72e021152a19" xlink:type="arc" order="18"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossBeforeTax_d26ccd75-7a53-4b0a-8bbc-c6a811db67ce" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossBeforeTax_d26ccd75-7a53-4b0a-8bbc-c6a811db67ce" xlink:type="arc" order="19"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_16a5fab9-c869-4c9a-84cb-b0cd75b86401" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax_16a5fab9-c869-4c9a-84cb-b0cd75b86401" xlink:type="arc" order="20"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0383d272-3521-4647-a128-b1eaa8a65bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_0383d272-3521-4647-a128-b1eaa8a65bdb" xlink:type="arc" order="21"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementTax_65f33b1e-3987-47f8-bf1f-f61028653b72" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementTax_65f33b1e-3987-47f8-bf1f-f61028653b72" xlink:type="arc" order="22"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnIncomeTaxExpenseBenefitTax_593dd864-c4b1-445b-948d-7a9a93232159" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnIncomeTaxExpenseBenefitTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnIncomeTaxExpenseBenefitTax_593dd864-c4b1-445b-948d-7a9a93232159" xlink:type="arc" order="23"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_2b90424b-68b3-4d3c-ad49-0c2974175b70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_2b90424b-68b3-4d3c-ad49-0c2974175b70" xlink:type="arc" order="24"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_6c621a42-4fae-469c-9058-4fbf59dbd74c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_6c621a42-4fae-469c-9058-4fbf59dbd74c" xlink:type="arc" order="25"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_7b39d93d-6601-4bbd-a17c-1bfdca56ce5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax_7b39d93d-6601-4bbd-a17c-1bfdca56ce5a" xlink:type="arc" order="26"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossReclassificationsTax_032d49b4-b2be-4721-bba4-35b413969736" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossReclassificationsTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossReclassificationsTax_032d49b4-b2be-4721-bba4-35b413969736" xlink:type="arc" order="27"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementAfterTax_2468039e-ab50-4e79-aa9f-b0defa302cbf" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementAfterTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDefinedBenefitPlanReclassificationAdjustmentFromAOCIIncludingEarningsOfActuarialLossForPensionSettlementAfterTax_2468039e-ab50-4e79-aa9f-b0defa302cbf" xlink:type="arc" order="28"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_237db64f-e40c-444c-af1f-69b51bc74098" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_237db64f-e40c-444c-af1f-69b51bc74098" xlink:type="arc" order="29"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossNetOfTax_ef2002ff-b309-4879-ab43-c03b7eb3d983" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossReclassificationAdjustmentToNetIncomeLossNetOfTax_ef2002ff-b309-4879-ab43-c03b7eb3d983" xlink:type="arc" order="30"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_cfc8567b-7b31-4b85-8bd1-6c175b1c981d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_cfc8567b-7b31-4b85-8bd1-6c175b1c981d" xlink:type="arc" order="31"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherComprehensiveIncomeLossDerivativesNetOfTax_67e17f85-bdac-4895-b489-56f290833456" xlink:href="tg-20231231.xsd#tg_OtherComprehensiveIncomeLossDerivativesNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_tg_OtherComprehensiveIncomeLossDerivativesNetOfTax_67e17f85-bdac-4895-b489-56f290833456" xlink:type="arc" order="32"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_535da687-9dba-47af-807a-853e672b545f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_535da687-9dba-47af-807a-853e672b545f" xlink:type="arc" order="33"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_4372cbcd-4aab-4db7-9dc7-343e72548a68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_e7ba1aa5-48a9-4f90-ba00-ab98ecff69a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_4372cbcd-4aab-4db7-9dc7-343e72548a68" xlink:type="arc" order="34"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c6b1e771-f997-42e4-ae86-f5cd57ac6e73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/AccountsAndOtherReceivablesScheduleOfReconciliationOfTheBeginningAndEndingBalancesOfTheAllowanceForDoubtfulAccountsAndSalesReturnsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#AccountsAndOtherReceivablesScheduleOfReconciliationOfTheBeginningAndEndingBalancesOfTheAllowanceForDoubtfulAccountsAndSalesReturnsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/AccountsAndOtherReceivablesScheduleOfReconciliationOfTheBeginningAndEndingBalancesOfTheAllowanceForDoubtfulAccountsAndSalesReturnsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_aa9a0e4c-0d8b-438f-9435-cdd6a5b65928" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_b62677d1-5443-4ebb-9605-fc1df0ba3f67" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_aa9a0e4c-0d8b-438f-9435-cdd6a5b65928" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_b62677d1-5443-4ebb-9605-fc1df0ba3f67" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f3a64723-357f-4f5a-b68f-c545716d6546" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_b62677d1-5443-4ebb-9605-fc1df0ba3f67" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f3a64723-357f-4f5a-b68f-c545716d6546" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_f3a64723-357f-4f5a-b68f-c545716d6546_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f3a64723-357f-4f5a-b68f-c545716d6546" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_f3a64723-357f-4f5a-b68f-c545716d6546_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_d60aa7bf-036b-4f82-863f-618e70e02c20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f3a64723-357f-4f5a-b68f-c545716d6546" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_d60aa7bf-036b-4f82-863f-618e70e02c20" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_3ae55f87-3133-4c81-b867-5496dd8158ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllowanceForCreditLossMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_d60aa7bf-036b-4f82-863f-618e70e02c20" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_3ae55f87-3133-4c81-b867-5496dd8158ef" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_aa9a0e4c-0d8b-438f-9435-cdd6a5b65928" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_c0af3677-8125-4d31-ad2d-8cb06c5ec724" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_c0af3677-8125-4d31-ad2d-8cb06c5ec724" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_3c0571bc-acde-47fe-983f-d78c7579dbb0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_3c0571bc-acde-47fe-983f-d78c7579dbb0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesRecoveries_4690163b-a04f-439c-ad1e-1adedc2633d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesRecoveries"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesRecoveries_4690163b-a04f-439c-ad1e-1adedc2633d9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_98d46d7c-5afc-41e0-bb25-6d9c8503f8b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_98d46d7c-5afc-41e0-bb25-6d9c8503f8b1" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_bfc33cbc-46ab-4486-b89d-31dac61ff547" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesAdjustments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_753c3173-e210-46fa-aa0e-11eb037fd786" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesAdjustments_bfc33cbc-46ab-4486-b89d-31dac61ff547" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_27df17c5-dd8c-4a76-ad2d-6d00b734c29e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfGoodwillAndOtherIntangiblesDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#GoodwillAndOtherIntangibleAssetsScheduleOfGoodwillAndOtherIntangiblesDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/GoodwillAndOtherIntangibleAssetsScheduleOfGoodwillAndOtherIntangiblesDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_tg_GoodwillAndOtherIntangibleAssetsLineItems_17665ef9-55e3-4592-bb97-4bd363acc891" xlink:href="tg-20231231.xsd#tg_GoodwillAndOtherIntangibleAssetsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GoodwillAndOtherIntangibleAssetsTable_34ad391b-9142-40a3-998b-e05719c8149b" xlink:href="tg-20231231.xsd#tg_GoodwillAndOtherIntangibleAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_tg_GoodwillAndOtherIntangibleAssetsLineItems_17665ef9-55e3-4592-bb97-4bd363acc891" xlink:to="loc_tg_GoodwillAndOtherIntangibleAssetsTable_34ad391b-9142-40a3-998b-e05719c8149b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_97457852-41b6-4641-a2c2-87e62071ba18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_GoodwillAndOtherIntangibleAssetsTable_34ad391b-9142-40a3-998b-e05719c8149b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_97457852-41b6-4641-a2c2-87e62071ba18" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_97457852-41b6-4641-a2c2-87e62071ba18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_97457852-41b6-4641-a2c2-87e62071ba18" xlink:to="loc_us-gaap_SegmentDomain_97457852-41b6-4641-a2c2-87e62071ba18_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d26fc4af-e0b7-40d3-9181-43e48008329a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_97457852-41b6-4641-a2c2-87e62071ba18" xlink:to="loc_us-gaap_SegmentDomain_d26fc4af-e0b7-40d3-9181-43e48008329a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_85c55f81-8c01-4a03-9d21-aca1010d0124" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d26fc4af-e0b7-40d3-9181-43e48008329a" xlink:to="loc_tg_AluminumExtrusionsMember_85c55f81-8c01-4a03-9d21-aca1010d0124" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PEFilmsMember_e9baa3d5-bbdb-465f-bc5e-ca4cb0210d08" xlink:href="tg-20231231.xsd#tg_PEFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d26fc4af-e0b7-40d3-9181-43e48008329a" xlink:to="loc_tg_PEFilmsMember_e9baa3d5-bbdb-465f-bc5e-ca4cb0210d08" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_d93a4277-0d7c-4677-ac1e-897d30b7f0b4" 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_tg_GoodwillAndOtherIntangibleAssetsLineItems_17665ef9-55e3-4592-bb97-4bd363acc891" xlink:to="loc_us-gaap_Goodwill_d93a4277-0d7c-4677-ac1e-897d30b7f0b4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_b9890199-363d-466a-ba0e-1c2a1108a8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_GoodwillAndOtherIntangibleAssetsLineItems_17665ef9-55e3-4592-bb97-4bd363acc891" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_b9890199-363d-466a-ba0e-1c2a1108a8b3" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/GoodwillAndOtherIntangibleAssetsReconciliationOfTheBeginningAndEndingBalanceOfGoodwillDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#GoodwillAndOtherIntangibleAssetsReconciliationOfTheBeginningAndEndingBalanceOfGoodwillDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/GoodwillAndOtherIntangibleAssetsReconciliationOfTheBeginningAndEndingBalanceOfGoodwillDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_9387f2df-636b-4e1d-b960-a7f7d5867cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_2da481ba-08cf-4c96-8f91-082dff4cf192" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_9387f2df-636b-4e1d-b960-a7f7d5867cf3" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_2da481ba-08cf-4c96-8f91-082dff4cf192" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7e81274e-0bca-48eb-bf88-0fed80598f7c" 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_us-gaap_ScheduleOfGoodwillTable_2da481ba-08cf-4c96-8f91-082dff4cf192" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7e81274e-0bca-48eb-bf88-0fed80598f7c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7e81274e-0bca-48eb-bf88-0fed80598f7c_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_7e81274e-0bca-48eb-bf88-0fed80598f7c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7e81274e-0bca-48eb-bf88-0fed80598f7c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3c227458-cb9d-4c8b-bdfd-5a2df2a72d86" 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_7e81274e-0bca-48eb-bf88-0fed80598f7c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3c227458-cb9d-4c8b-bdfd-5a2df2a72d86" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_a7992da1-0c35-45f7-bbfd-e914c0dc9159" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3c227458-cb9d-4c8b-bdfd-5a2df2a72d86" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_a7992da1-0c35-45f7-bbfd-e914c0dc9159" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_89d69c9a-690d-4a09-95ee-45981a4ecb7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3c227458-cb9d-4c8b-bdfd-5a2df2a72d86" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_89d69c9a-690d-4a09-95ee-45981a4ecb7a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_c62fbda5-7222-460e-9148-c5d980ec3126" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TradeNamesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3c227458-cb9d-4c8b-bdfd-5a2df2a72d86" xlink:to="loc_us-gaap_TradeNamesMember_c62fbda5-7222-460e-9148-c5d980ec3126" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_ee4f475b-7ccd-43f8-a544-f06702867881" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_9387f2df-636b-4e1d-b960-a7f7d5867cf3" xlink:to="loc_us-gaap_GoodwillRollForward_ee4f475b-7ccd-43f8-a544-f06702867881" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_b80d01d6-d839-4f36-970b-aaedb7634214" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_ee4f475b-7ccd-43f8-a544-f06702867881" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_b80d01d6-d839-4f36-970b-aaedb7634214" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ccfed936-5c81-4760-b5ed-8ccb3565362c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_ee4f475b-7ccd-43f8-a544-f06702867881" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ccfed936-5c81-4760-b5ed-8ccb3565362c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_4c8836e0-7507-4972-8491-fc4eaa945339" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_ee4f475b-7ccd-43f8-a544-f06702867881" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_4c8836e0-7507-4972-8491-fc4eaa945339" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/DebtAndCreditAgreementsNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#DebtAndCreditAgreementsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/DebtAndCreditAgreementsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_b1568d77-9c3b-482a-ac29-3b4d0c045c67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_b1568d77-9c3b-482a-ac29-3b4d0c045c67" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cfc0fa81-8e3f-4428-bb6f-192a2927f05a" 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_LineOfCreditFacilityTable_b1568d77-9c3b-482a-ac29-3b4d0c045c67" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cfc0fa81-8e3f-4428-bb6f-192a2927f05a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cfc0fa81-8e3f-4428-bb6f-192a2927f05a_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_cfc0fa81-8e3f-4428-bb6f-192a2927f05a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cfc0fa81-8e3f-4428-bb6f-192a2927f05a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5662221e-cce3-4b1f-b192-e1b7a18c163c" 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_cfc0fa81-8e3f-4428-bb6f-192a2927f05a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5662221e-cce3-4b1f-b192-e1b7a18c163c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_348fd5b8-069a-426e-9642-0c50c063c569" 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_5662221e-cce3-4b1f-b192-e1b7a18c163c" xlink:to="loc_us-gaap_LineOfCreditMember_348fd5b8-069a-426e-9642-0c50c063c569" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957" 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_LineOfCreditFacilityTable_b1568d77-9c3b-482a-ac29-3b4d0c045c67" xlink:to="loc_us-gaap_VariableRateAxis_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957_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_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957" xlink:to="loc_us-gaap_VariableRateDomain_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f69e9daf-816c-4387-9d95-bc379f2cd079" 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_7eff3a5d-aaa3-431d-a8fe-6b2d7726b957" xlink:to="loc_us-gaap_VariableRateDomain_f69e9daf-816c-4387-9d95-bc379f2cd079" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SecuredOvernightFinancingRateSOFRMember_8a0bdea2-9be5-4a57-b1f3-b8cdae633212" xlink:href="tg-20231231.xsd#tg_SecuredOvernightFinancingRateSOFRMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_f69e9daf-816c-4387-9d95-bc379f2cd079" xlink:to="loc_tg_SecuredOvernightFinancingRateSOFRMember_8a0bdea2-9be5-4a57-b1f3-b8cdae633212" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AlternateBaseRateMember_5c02185a-f340-4325-acd1-c148a8fca4f9" xlink:href="tg-20231231.xsd#tg_AlternateBaseRateMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_f69e9daf-816c-4387-9d95-bc379f2cd079" xlink:to="loc_tg_AlternateBaseRateMember_5c02185a-f340-4325-acd1-c148a8fca4f9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_0cb571c9-f763-4ceb-9b41-24a5173c981c" 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_LineOfCreditFacilityTable_b1568d77-9c3b-482a-ac29-3b4d0c045c67" xlink:to="loc_us-gaap_DebtInstrumentAxis_0cb571c9-f763-4ceb-9b41-24a5173c981c" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0cb571c9-f763-4ceb-9b41-24a5173c981c_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_0cb571c9-f763-4ceb-9b41-24a5173c981c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0cb571c9-f763-4ceb-9b41-24a5173c981c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5d028f05-a9ff-4e56-a3c5-3902b853f0c6" 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_0cb571c9-f763-4ceb-9b41-24a5173c981c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5d028f05-a9ff-4e56-a3c5-3902b853f0c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TerphaneBrazilLoanMember_8961762d-60d3-4c46-a404-1b5ea807b3d6" xlink:href="tg-20231231.xsd#tg_TerphaneBrazilLoanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5d028f05-a9ff-4e56-a3c5-3902b853f0c6" xlink:to="loc_tg_TerphaneBrazilLoanMember_8961762d-60d3-4c46-a404-1b5ea807b3d6" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TredegarIntercompanyMember_39960dd5-8d13-4cb6-9ede-529b84a27039" xlink:href="tg-20231231.xsd#tg_TredegarIntercompanyMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5d028f05-a9ff-4e56-a3c5-3902b853f0c6" xlink:to="loc_tg_TredegarIntercompanyMember_39960dd5-8d13-4cb6-9ede-529b84a27039" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5d585f9f-a915-474f-ac30-f5d4c47f4564" 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_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5d585f9f-a915-474f-ac30-f5d4c47f4564" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_LineOfCreditMaximumBorrowingCapacityAfterModification_9f56d0e1-86a0-4d5c-a788-64fbf5299024" xlink:href="tg-20231231.xsd#tg_LineOfCreditMaximumBorrowingCapacityAfterModification"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_LineOfCreditMaximumBorrowingCapacityAfterModification_9f56d0e1-86a0-4d5c-a788-64fbf5299024" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_LineOfCreditMaximumBorrowingCapacityAfterABLAdjustmentDate_d40c4ba7-973a-4320-bc52-16a748f96de0" xlink:href="tg-20231231.xsd#tg_LineOfCreditMaximumBorrowingCapacityAfterABLAdjustmentDate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_LineOfCreditMaximumBorrowingCapacityAfterABLAdjustmentDate_d40c4ba7-973a-4320-bc52-16a748f96de0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_a80a3b6f-07d1-4581-a8bf-422875afac0b" 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_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_a80a3b6f-07d1-4581-a8bf-422875afac0b" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_90deff81-1d4d-4f87-bc70-2a63aea32c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortTermBorrowings"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_ShortTermBorrowings_90deff81-1d4d-4f87-bc70-2a63aea32c5a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_6c281e40-dfbe-4270-af58-f2a1df43dcc6" 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_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_6c281e40-dfbe-4270-af58-f2a1df43dcc6" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_088e127d-2ab0-4c9a-b7b4-afb4b307f505" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsGross"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_088e127d-2ab0-4c9a-b7b4-afb4b307f505" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32d395fa-e352-4ab9-b2f7-c06d85110b3b" 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_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32d395fa-e352-4ab9-b2f7-c06d85110b3b" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CashDominionAvailabilityAfterABLAdjustmentDate_4ebb64ce-bf17-41ea-ab04-b896eaedc01b" xlink:href="tg-20231231.xsd#tg_CashDominionAvailabilityAfterABLAdjustmentDate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_CashDominionAvailabilityAfterABLAdjustmentDate_4ebb64ce-bf17-41ea-ab04-b896eaedc01b" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumLiquidityUnderABLFacility_cf37415e-582f-4424-9606-40fbe16d0080" xlink:href="tg-20231231.xsd#tg_MinimumLiquidityUnderABLFacility"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_MinimumLiquidityUnderABLFacility_cf37415e-582f-4424-9606-40fbe16d0080" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumAvailabilityBeforeABLAdjustmentDate_dd64c27a-ea19-4677-af53-4958ff67961b" xlink:href="tg-20231231.xsd#tg_MinimumAvailabilityBeforeABLAdjustmentDate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_MinimumAvailabilityBeforeABLAdjustmentDate_dd64c27a-ea19-4677-af53-4958ff67961b" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumAvailabilityAfterABLAdjustmentDate_24d0a56b-a3dd-408f-bcaf-8d259d718e21" xlink:href="tg-20231231.xsd#tg_MinimumAvailabilityAfterABLAdjustmentDate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_tg_MinimumAvailabilityAfterABLAdjustmentDate_24d0a56b-a3dd-408f-bcaf-8d259d718e21" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherBorrowings_814ccf5d-5c6f-4097-b8b1-97e91bb63682" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherBorrowings"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_OtherBorrowings_814ccf5d-5c6f-4097-b8b1-97e91bb63682" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_81e00dba-8e72-48ea-bfef-72d0c073f185" 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_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_81e00dba-8e72-48ea-bfef-72d0c073f185" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_89dae06e-3860-4bac-91e9-495db6dee2fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_89a67535-0d08-4630-b783-90b4b2c4b977" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_89dae06e-3860-4bac-91e9-495db6dee2fc" xlink:type="arc" order="14"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/DebtAndCreditAgreementsScheduleOfBorrowingsUnderCreditAgreementAtVariousIndebtednessToAdjustedEBITDALevelsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#DebtAndCreditAgreementsScheduleOfBorrowingsUnderCreditAgreementAtVariousIndebtednessToAdjustedEBITDALevelsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/DebtAndCreditAgreementsScheduleOfBorrowingsUnderCreditAgreementAtVariousIndebtednessToAdjustedEBITDALevelsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_6adc3a9b-a7e0-4309-bacb-53a13047dbc0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_a84eea3a-9677-49f5-9c4f-e232735f6ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_6adc3a9b-a7e0-4309-bacb-53a13047dbc0" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_a84eea3a-9677-49f5-9c4f-e232735f6ae6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_91e15beb-5202-4348-8ca5-9fadd90c7c53" 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_LineOfCreditFacilityTable_a84eea3a-9677-49f5-9c4f-e232735f6ae6" xlink:to="loc_us-gaap_CreditFacilityAxis_91e15beb-5202-4348-8ca5-9fadd90c7c53" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_91e15beb-5202-4348-8ca5-9fadd90c7c53_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_91e15beb-5202-4348-8ca5-9fadd90c7c53" xlink:to="loc_us-gaap_CreditFacilityDomain_91e15beb-5202-4348-8ca5-9fadd90c7c53_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c77d7efe-72f3-475b-b5de-d596230885f3" 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_91e15beb-5202-4348-8ca5-9fadd90c7c53" xlink:to="loc_us-gaap_CreditFacilityDomain_c77d7efe-72f3-475b-b5de-d596230885f3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Over66Of125MillionAggregateCommitmentMember_fcd94090-b547-4bee-a06f-6e078f3fc4da" xlink:href="tg-20231231.xsd#tg_Over66Of125MillionAggregateCommitmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_c77d7efe-72f3-475b-b5de-d596230885f3" xlink:to="loc_tg_Over66Of125MillionAggregateCommitmentMember_fcd94090-b547-4bee-a06f-6e078f3fc4da" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_LessThan66ButOver33Of125MillionAggregateCommitmentMember_61cec40b-11c6-481c-814d-e4f0d49cd7f6" xlink:href="tg-20231231.xsd#tg_LessThan66ButOver33Of125MillionAggregateCommitmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_c77d7efe-72f3-475b-b5de-d596230885f3" xlink:to="loc_tg_LessThan66ButOver33Of125MillionAggregateCommitmentMember_61cec40b-11c6-481c-814d-e4f0d49cd7f6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_LessThen33Of125MillionAggregateCommitmentMember_96d31e55-f6d6-4115-beef-8eda9f8b97c8" xlink:href="tg-20231231.xsd#tg_LessThen33Of125MillionAggregateCommitmentMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_c77d7efe-72f3-475b-b5de-d596230885f3" xlink:to="loc_tg_LessThen33Of125MillionAggregateCommitmentMember_96d31e55-f6d6-4115-beef-8eda9f8b97c8" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CreditSpreadOverSecuredOvernightFinancingRateBasisPoints_18aa6c81-7454-4414-829f-60988d4da964" xlink:href="tg-20231231.xsd#tg_CreditSpreadOverSecuredOvernightFinancingRateBasisPoints"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_6adc3a9b-a7e0-4309-bacb-53a13047dbc0" xlink:to="loc_tg_CreditSpreadOverSecuredOvernightFinancingRateBasisPoints_18aa6c81-7454-4414-829f-60988d4da964" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CreditSpreadOverAlternateBaseRateBasisPoints_e185bdc3-b005-42b4-a53d-daa30bb9f0a7" xlink:href="tg-20231231.xsd#tg_CreditSpreadOverAlternateBaseRateBasisPoints"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_6adc3a9b-a7e0-4309-bacb-53a13047dbc0" xlink:to="loc_tg_CreditSpreadOverAlternateBaseRateBasisPoints_e185bdc3-b005-42b4-a53d-daa30bb9f0a7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CommitmentFeeOnCreditFacilityBasisPoints_e6680b88-4b38-41a4-b597-62f20a1316f8" xlink:href="tg-20231231.xsd#tg_CommitmentFeeOnCreditFacilityBasisPoints"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_6adc3a9b-a7e0-4309-bacb-53a13047dbc0" xlink:to="loc_tg_CommitmentFeeOnCreditFacilityBasisPoints_e6680b88-4b38-41a4-b597-62f20a1316f8" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/DebtAndCreditAgreementsSummaryOfTotalDebtDueAndOutstandingDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#DebtAndCreditAgreementsSummaryOfTotalDebtDueAndOutstandingDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/DebtAndCreditAgreementsSummaryOfTotalDebtDueAndOutstandingDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d04afecb-1037-4f94-a42c-7d65995d08e5" 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_5beee7ff-4df6-48fc-995b-5f08d34dcb71" 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_d04afecb-1037-4f94-a42c-7d65995d08e5" xlink:to="loc_us-gaap_DebtInstrumentTable_5beee7ff-4df6-48fc-995b-5f08d34dcb71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumEBITDAAxis_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd" xlink:href="tg-20231231.xsd#tg_MinimumEBITDAAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5beee7ff-4df6-48fc-995b-5f08d34dcb71" xlink:to="loc_tg_MinimumEBITDAAxis_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumEBITDADomain_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd_default" xlink:href="tg-20231231.xsd#tg_MinimumEBITDADomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_tg_MinimumEBITDAAxis_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd" xlink:to="loc_tg_MinimumEBITDADomain_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:href="tg-20231231.xsd#tg_MinimumEBITDADomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_tg_MinimumEBITDAAxis_3fe1d852-8f18-4fd7-aec6-9f86311f0fbd" xlink:to="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_December2023Member_6a810faa-bb9b-4d28-988e-6293b3348e14" xlink:href="tg-20231231.xsd#tg_December2023Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_December2023Member_6a810faa-bb9b-4d28-988e-6293b3348e14" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_January2024Member_368cb34e-de58-4c92-875b-ae8c77a91057" xlink:href="tg-20231231.xsd#tg_January2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_January2024Member_368cb34e-de58-4c92-875b-ae8c77a91057" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_February2024Member_3fda6394-5ca0-45a3-8ca6-00e59fec0386" xlink:href="tg-20231231.xsd#tg_February2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_February2024Member_3fda6394-5ca0-45a3-8ca6-00e59fec0386" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_March2024Member_5ca88686-66f5-4d6a-9899-50b2d08e8b58" xlink:href="tg-20231231.xsd#tg_March2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_March2024Member_5ca88686-66f5-4d6a-9899-50b2d08e8b58" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_April2024Member_a943b3a4-e854-4ad3-a7a1-b00fceb8b306" xlink:href="tg-20231231.xsd#tg_April2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_April2024Member_a943b3a4-e854-4ad3-a7a1-b00fceb8b306" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_May2024Member_088e5c18-02f7-4839-9639-c2c70a0d04b5" xlink:href="tg-20231231.xsd#tg_May2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_May2024Member_088e5c18-02f7-4839-9639-c2c70a0d04b5" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_June2024Member_3425a7b9-16d3-4fec-a433-a26c60098f8d" xlink:href="tg-20231231.xsd#tg_June2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_June2024Member_3425a7b9-16d3-4fec-a433-a26c60098f8d" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_July2024Member_81dd5a2f-d79c-401e-a16c-4b3909032257" xlink:href="tg-20231231.xsd#tg_July2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_July2024Member_81dd5a2f-d79c-401e-a16c-4b3909032257" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_August2024Member_b98e1a15-c24d-4efc-8b4f-f69aa306e3b5" xlink:href="tg-20231231.xsd#tg_August2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_August2024Member_b98e1a15-c24d-4efc-8b4f-f69aa306e3b5" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_September2024Member_6f0d4193-68e9-4110-9faa-354b6ae9a284" xlink:href="tg-20231231.xsd#tg_September2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_September2024Member_6f0d4193-68e9-4110-9faa-354b6ae9a284" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_October2024Member_0955b8f1-6698-4177-9aa9-8c4c4c22ad2e" xlink:href="tg-20231231.xsd#tg_October2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_October2024Member_0955b8f1-6698-4177-9aa9-8c4c4c22ad2e" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_November2024Member_9d0292fd-2010-47d4-b4ec-c0447a5145a2" xlink:href="tg-20231231.xsd#tg_November2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_November2024Member_9d0292fd-2010-47d4-b4ec-c0447a5145a2" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_December2024Member_c83f9041-1184-4cab-8fda-665fcf64dc08" xlink:href="tg-20231231.xsd#tg_December2024Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_December2024Member_c83f9041-1184-4cab-8fda-665fcf64dc08" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_January2025Member_c89ea0c9-d00d-477e-9241-a850e9bc0845" xlink:href="tg-20231231.xsd#tg_January2025Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_January2025Member_c89ea0c9-d00d-477e-9241-a850e9bc0845" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_February2025Member_81407d9b-d713-43bc-8150-6b788850d858" xlink:href="tg-20231231.xsd#tg_February2025Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_February2025Member_81407d9b-d713-43bc-8150-6b788850d858" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_March2025Member_16db93b7-4189-44ab-9ef4-5b27b7392053" xlink:href="tg-20231231.xsd#tg_March2025Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_MinimumEBITDADomain_083e5597-c51a-4f33-8863-1d79eb2ccfef" xlink:to="loc_tg_March2025Member_16db93b7-4189-44ab-9ef4-5b27b7392053" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MinimumEBITDA_585201ee-498b-4e57-92b3-3c582652371b" xlink:href="tg-20231231.xsd#tg_MinimumEBITDA"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d04afecb-1037-4f94-a42c-7d65995d08e5" xlink:to="loc_tg_MinimumEBITDA_585201ee-498b-4e57-92b3-3c582652371b" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_2840af79-16df-4be4-aa22-752e581e0e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_2840af79-16df-4be4-aa22-752e581e0e8f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_2840af79-16df-4be4-aa22-752e581e0e8f" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3a9657ed-358d-40d6-ac47-1013cd5b96bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_e246fc8b-c39c-4da6-8fb9-aa49dd251dd0" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3a9657ed-358d-40d6-ac47-1013cd5b96bf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_1e98b5c1-be2b-476d-bf75-2d40ffdf6431" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3a9657ed-358d-40d6-ac47-1013cd5b96bf" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_1e98b5c1-be2b-476d-bf75-2d40ffdf6431" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_UnfundedNonQualifiedSupplementalPensionPlanMember_92960e1e-95cb-42b4-a6c8-45701b4f33df" xlink:href="tg-20231231.xsd#tg_UnfundedNonQualifiedSupplementalPensionPlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3a9657ed-358d-40d6-ac47-1013cd5b96bf" xlink:to="loc_tg_UnfundedNonQualifiedSupplementalPensionPlanMember_92960e1e-95cb-42b4-a6c8-45701b4f33df" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_9a985c32-45eb-4a1e-bbdb-d44cc39e368e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3a9657ed-358d-40d6-ac47-1013cd5b96bf" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_9a985c32-45eb-4a1e-bbdb-d44cc39e368e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_e46912b5-5b2a-4b97-b0d8-55b14ec8b73a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_e46912b5-5b2a-4b97-b0d8-55b14ec8b73a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PreTaxActuarialLossForPensionSettlement_b005c6f6-339d-46f2-804f-9990d6c767a2" xlink:href="tg-20231231.xsd#tg_PreTaxActuarialLossForPensionSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_PreTaxActuarialLossForPensionSettlement_b005c6f6-339d-46f2-804f-9990d6c767a2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PensionLumpSumDistribution_3cb48c4c-cdcf-485c-933c-d7084acb7cad" xlink:href="tg-20231231.xsd#tg_PensionLumpSumDistribution"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_PensionLumpSumDistribution_3cb48c4c-cdcf-485c-933c-d7084acb7cad" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PensionSettlementBorrowings_e05d7ea2-19f9-451d-87f4-6b61d5810367" xlink:href="tg-20231231.xsd#tg_PensionSettlementBorrowings"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_PensionSettlementBorrowings_e05d7ea2-19f9-451d-87f4-6b61d5810367" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedBenefitPlanGroupAnnuityContractPurchaseAmount_121a8f44-274e-4919-b71e-9faf8fd3f598" xlink:href="tg-20231231.xsd#tg_DefinedBenefitPlanGroupAnnuityContractPurchaseAmount"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_DefinedBenefitPlanGroupAnnuityContractPurchaseAmount_121a8f44-274e-4919-b71e-9faf8fd3f598" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedContributionPlanAdjustment_891fc731-9074-49f0-89f1-d5c4755d5a5b" xlink:href="tg-20231231.xsd#tg_DefinedContributionPlanAdjustment"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_DefinedContributionPlanAdjustment_891fc731-9074-49f0-89f1-d5c4755d5a5b" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_435b4832-aaf8-4384-8a33-909d57a0a2d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_435b4832-aaf8-4384-8a33-909d57a0a2d5" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_388c4304-0717-405d-8986-4227e062dc39" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_388c4304-0717-405d-8986-4227e062dc39" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PercentageOfChangeInHealthCareCostTrendRateAssumptionsWouldBeImmaterial_a0a632b4-3d30-4511-a524-d43ec9d72418" xlink:href="tg-20231231.xsd#tg_PercentageOfChangeInHealthCareCostTrendRateAssumptionsWouldBeImmaterial"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_PercentageOfChangeInHealthCareCostTrendRateAssumptionsWouldBeImmaterial_a0a632b4-3d30-4511-a524-d43ec9d72418" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_8f250ba9-242a-40f8-9772-3d879c702218" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_8f250ba9-242a-40f8-9772-3d879c702218" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SettlementFundingGap_1d17cd72-6c3e-4277-bfcc-982eaeb13682" xlink:href="tg-20231231.xsd#tg_SettlementFundingGap"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_tg_SettlementFundingGap_1d17cd72-6c3e-4277-bfcc-982eaeb13682" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_170db2e2-9d42-4d7d-bdec-424fb5eab386" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_31c0bbfb-1a08-406c-870f-7d72e5172895" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_170db2e2-9d42-4d7d-bdec-424fb5eab386" xlink:type="arc" order="11"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsReconciliationOfChangesInBenefitObligationsAndPlanAssetsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsReconciliationOfChangesInBenefitObligationsAndPlanAssetsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsReconciliationOfChangesInBenefitObligationsAndPlanAssetsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1497a2f5-6e8e-475d-88f5-261965921463" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1497a2f5-6e8e-475d-88f5-261965921463" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_4ba43887-8403-4ce9-a6cd-49eb9db9085c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1497a2f5-6e8e-475d-88f5-261965921463" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_4ba43887-8403-4ce9-a6cd-49eb9db9085c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_4ba43887-8403-4ce9-a6cd-49eb9db9085c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_4ba43887-8403-4ce9-a6cd-49eb9db9085c" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_4ba43887-8403-4ce9-a6cd-49eb9db9085c_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_14b138f4-e6b5-44d5-bd64-eccda41f335c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_4ba43887-8403-4ce9-a6cd-49eb9db9085c" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_14b138f4-e6b5-44d5-bd64-eccda41f335c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AccruedExpensesMember_64d890f4-47d0-4b21-b634-dd5d203fdde2" xlink:href="tg-20231231.xsd#tg_AccruedExpensesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_14b138f4-e6b5-44d5-bd64-eccda41f335c" xlink:to="loc_tg_AccruedExpensesMember_64d890f4-47d0-4b21-b634-dd5d203fdde2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_9c738c11-af7f-4233-9dee-1d5f23c0bf88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_14b138f4-e6b5-44d5-bd64-eccda41f335c" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_9c738c11-af7f-4233-9dee-1d5f23c0bf88" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_910dfc91-37a7-44b1-95e3-728d4fd569e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1497a2f5-6e8e-475d-88f5-261965921463" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_910dfc91-37a7-44b1-95e3-728d4fd569e4" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_910dfc91-37a7-44b1-95e3-728d4fd569e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_910dfc91-37a7-44b1-95e3-728d4fd569e4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_910dfc91-37a7-44b1-95e3-728d4fd569e4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_a599088b-9b4f-4c66-8ee2-e0f4c89e0818" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_910dfc91-37a7-44b1-95e3-728d4fd569e4" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_a599088b-9b4f-4c66-8ee2-e0f4c89e0818" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_62ce3b3c-7a95-4d8f-b63b-6be4f2424c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_a599088b-9b4f-4c66-8ee2-e0f4c89e0818" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_62ce3b3c-7a95-4d8f-b63b-6be4f2424c0e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_7b6e6090-2ae3-4058-8d5f-2b20193981c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_a599088b-9b4f-4c66-8ee2-e0f4c89e0818" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_7b6e6090-2ae3-4058-8d5f-2b20193981c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_fbc0dcbf-a057-47b3-a13e-28203c41ac7e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_fbc0dcbf-a057-47b3-a13e-28203c41ac7e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_af72c5f1-6265-4184-842d-6847f40f7859" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_af72c5f1-6265-4184-842d-6847f40f7859" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_41e4f29f-bbdd-4a54-a775-b728d3b7f59e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_41e4f29f-bbdd-4a54-a775-b728d3b7f59e" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetGainLossBeforeTaxAbstract_eee772ab-bcea-4a0f-b9b0-2693f1239ded" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetGainLossBeforeTaxAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetGainLossBeforeTaxAbstract_eee772ab-bcea-4a0f-b9b0-2693f1239ded" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EffectOfActuarialGainsLossesDiscountRateChange_298208e0-4f50-4a56-814e-acea81487b63" xlink:href="tg-20231231.xsd#tg_EffectOfActuarialGainsLossesDiscountRateChange"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetGainLossBeforeTaxAbstract_eee772ab-bcea-4a0f-b9b0-2693f1239ded" xlink:to="loc_tg_EffectOfActuarialGainsLossesDiscountRateChange_298208e0-4f50-4a56-814e-acea81487b63" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EffectOfActuarialGainsLossesOther_544f79dc-eca4-4acb-8911-794bca4901e6" xlink:href="tg-20231231.xsd#tg_EffectOfActuarialGainsLossesOther"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetGainLossBeforeTaxAbstract_eee772ab-bcea-4a0f-b9b0-2693f1239ded" xlink:to="loc_tg_EffectOfActuarialGainsLossesOther_544f79dc-eca4-4acb-8911-794bca4901e6" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_c6aa2a4c-b81a-4812-8cf9-e76cd1324c68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant_c6aa2a4c-b81a-4812-8cf9-e76cd1324c68" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_062b583a-a54d-4a4c-ad2f-e0df2d6479ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_062b583a-a54d-4a4c-ad2f-e0df2d6479ec" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_0bcaadad-0e6c-4e05-9625-e350d930f37e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_a3198fce-a747-40f7-8f19-cae259555376" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_0bcaadad-0e6c-4e05-9625-e350d930f37e" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_408a4e6a-5ca1-4000-a38e-7dc9e4589b80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_e832dc3c-c0fe-4655-9a44-1b3c48bbb555" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_e832dc3c-c0fe-4655-9a44-1b3c48bbb555" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_b9997084-361e-4bbc-8337-5f76ccc3099d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_b9997084-361e-4bbc-8337-5f76ccc3099d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_cbfecf6e-7c00-4b0a-899c-a1cf67f692ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_cbfecf6e-7c00-4b0a-899c-a1cf67f692ed" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_2ebb449a-5505-4f1f-8371-500cf497cf80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant_2ebb449a-5505-4f1f-8371-500cf497cf80" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_42c33588-6b75-4d48-9397-3e30b53e2351" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_42c33588-6b75-4d48-9397-3e30b53e2351" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_9f2a50fb-b776-483c-94db-20d58fbe3fef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_2331fe18-1b7f-424b-8a24-42991e3a70ad" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_9f2a50fb-b776-483c-94db-20d58fbe3fef" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_9885de39-31f0-4bb5-9c83-04565b231559" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_eb66f03b-46a5-4e56-a749-bcd5db82e58b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_eb66f03b-46a5-4e56-a749-bcd5db82e58b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_73bd87a1-f0c4-4112-ac33-1b55219959bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_140b9666-ac19-43a0-9e25-fb212a029b25" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_73bd87a1-f0c4-4112-ac33-1b55219959bb" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_32fd6d8b-e15e-4855-ab9e-2d8f82f1ead9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_73bd87a1-f0c4-4112-ac33-1b55219959bb" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_32fd6d8b-e15e-4855-ab9e-2d8f82f1ead9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_807c03f7-d157-460b-9b38-f57efbb1b1af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_73bd87a1-f0c4-4112-ac33-1b55219959bb" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_807c03f7-d157-460b-9b38-f57efbb1b1af" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_3c669667-f2dc-4bcf-bb19-8cc26950b0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_73bd87a1-f0c4-4112-ac33-1b55219959bb" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_3c669667-f2dc-4bcf-bb19-8cc26950b0a1" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitIncomeOrCostForContinuingOperationsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitIncomeOrCostForContinuingOperationsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsComponentsOfNetPeriodicBenefitIncomeOrCostForContinuingOperationsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_33910716-6792-4b42-be2b-72f55ed83f00" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_33910716-6792-4b42-be2b-72f55ed83f00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_eba23ae4-3390-4972-8c23-e479d8554696" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_33910716-6792-4b42-be2b-72f55ed83f00" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_eba23ae4-3390-4972-8c23-e479d8554696" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_eba23ae4-3390-4972-8c23-e479d8554696_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_eba23ae4-3390-4972-8c23-e479d8554696" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_eba23ae4-3390-4972-8c23-e479d8554696_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_918a422a-8e61-4293-bf90-565dd1d79b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_eba23ae4-3390-4972-8c23-e479d8554696" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_918a422a-8e61-4293-bf90-565dd1d79b9d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_91109ff7-0952-41a7-8318-0123f552385f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_918a422a-8e61-4293-bf90-565dd1d79b9d" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_91109ff7-0952-41a7-8318-0123f552385f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5fccf9ff-7b37-4135-94e7-b64ab1611b1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_918a422a-8e61-4293-bf90-565dd1d79b9d" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5fccf9ff-7b37-4135-94e7-b64ab1611b1d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2ac84ef6-4be6-4343-b02c-ed8934320c18" 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_ScheduleOfDefinedBenefitPlansDisclosuresTable_33910716-6792-4b42-be2b-72f55ed83f00" xlink:to="loc_srt_RangeAxis_2ac84ef6-4be6-4343-b02c-ed8934320c18" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2ac84ef6-4be6-4343-b02c-ed8934320c18_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_2ac84ef6-4be6-4343-b02c-ed8934320c18" xlink:to="loc_srt_RangeMember_2ac84ef6-4be6-4343-b02c-ed8934320c18_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_66b516be-9762-45c4-b125-353b3c3feb3a" 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_2ac84ef6-4be6-4343-b02c-ed8934320c18" xlink:to="loc_srt_RangeMember_66b516be-9762-45c4-b125-353b3c3feb3a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3278fbc1-b223-4718-956c-015f30735cd1" 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_66b516be-9762-45c4-b125-353b3c3feb3a" xlink:to="loc_srt_MinimumMember_3278fbc1-b223-4718-956c-015f30735cd1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b3fc5d06-4623-4cd9-a922-96706c12ff54" 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_66b516be-9762-45c4-b125-353b3c3feb3a" xlink:to="loc_srt_MaximumMember_b3fc5d06-4623-4cd9-a922-96706c12ff54" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_53f85729-6e72-4374-b778-0ecb1b349f15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_53f85729-6e72-4374-b778-0ecb1b349f15" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_d4448a29-2291-490a-ab18-25d005b73b1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_53f85729-6e72-4374-b778-0ecb1b349f15" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_d4448a29-2291-490a-ab18-25d005b73b1a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd_86261d34-1c08-4138-b135-05b0deaabf2f" xlink:href="tg-20231231.xsd#tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_53f85729-6e72-4374-b778-0ecb1b349f15" xlink:to="loc_tg_DefinedBenefitPlanAssumptionExpectedLongTermReturnOnAssetsAtYearEnd_86261d34-1c08-4138-b135-05b0deaabf2f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a3164e27-62eb-4d85-b202-6eecd2ebfae2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a3164e27-62eb-4d85-b202-6eecd2ebfae2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_3deae96f-7b5c-44d7-a070-11c00da29651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a3164e27-62eb-4d85-b202-6eecd2ebfae2" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_3deae96f-7b5c-44d7-a070-11c00da29651" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_3deb10b2-cc94-4b33-b8be-3b15650b4e9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_a3164e27-62eb-4d85-b202-6eecd2ebfae2" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_3deb10b2-cc94-4b33-b8be-3b15650b4e9a" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_1da28d8a-400d-444d-99d6-a038635840c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_1da28d8a-400d-444d-99d6-a038635840c5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_c13c42b1-008b-4511-b24f-ccb9bf29589c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_c13c42b1-008b-4511-b24f-ccb9bf29589c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_288f3716-2880-4434-972e-2af78c8ecb68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_288f3716-2880-4434-972e-2af78c8ecb68" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AmortizationOfPriorServiceCostsAndNetGainsLoss_bf5b7c46-65de-4caf-bf10-981331112ddd" xlink:href="tg-20231231.xsd#tg_AmortizationOfPriorServiceCostsAndNetGainsLoss"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:to="loc_tg_AmortizationOfPriorServiceCostsAndNetGainsLoss_bf5b7c46-65de-4caf-bf10-981331112ddd" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_7a8ff50a-661c-4e58-a2d3-51d8c0bcf75e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_91f8344d-cd38-4584-a641-d140498983ba" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_7a8ff50a-661c-4e58-a2d3-51d8c0bcf75e" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PreTaxActuarialLossForPensionSettlement_24fdb0a6-1982-4a83-8785-5a71d502f9b4" xlink:href="tg-20231231.xsd#tg_PreTaxActuarialLossForPensionSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_tg_PreTaxActuarialLossForPensionSettlement_24fdb0a6-1982-4a83-8785-5a71d502f9b4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedBenefitPlanTotalBenefitCost_599769e4-62f4-4c19-8d76-aa0aca46dd6f" xlink:href="tg-20231231.xsd#tg_DefinedBenefitPlanTotalBenefitCost"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_81a4adfd-d144-412e-a407-e87a22809818" xlink:to="loc_tg_DefinedBenefitPlanTotalBenefitCost_599769e4-62f4-4c19-8d76-aa0aca46dd6f" xlink:type="arc" order="4"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfExpectedBenefitPaymentsForContinuingOperationsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsScheduleOfExpectedBenefitPaymentsForContinuingOperationsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfExpectedBenefitPaymentsForContinuingOperationsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_284e4e9b-a0f7-4a5b-930b-cd12212c0e43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_284e4e9b-a0f7-4a5b-930b-cd12212c0e43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_cb0aeae7-7114-44ed-b206-620088920780" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_284e4e9b-a0f7-4a5b-930b-cd12212c0e43" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_cb0aeae7-7114-44ed-b206-620088920780" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_cb0aeae7-7114-44ed-b206-620088920780_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cb0aeae7-7114-44ed-b206-620088920780" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_cb0aeae7-7114-44ed-b206-620088920780_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ab0c1948-c1fd-4015-bd76-d3f5ab74f161" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_cb0aeae7-7114-44ed-b206-620088920780" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ab0c1948-c1fd-4015-bd76-d3f5ab74f161" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_d5ba6786-3bf4-4e02-a717-aa3926a356d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_ab0c1948-c1fd-4015-bd76-d3f5ab74f161" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_d5ba6786-3bf4-4e02-a717-aa3926a356d9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_6febe49f-8373-4af3-a3ef-4f2f2c5a7862" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_ab0c1948-c1fd-4015-bd76-d3f5ab74f161" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_6febe49f-8373-4af3-a3ef-4f2f2c5a7862" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_47e9f7e6-2958-4a36-b3b3-05d4850c0665" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_47e9f7e6-2958-4a36-b3b3-05d4850c0665" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_04931689-ac79-4ad3-a8fe-02819e7d3684" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_04931689-ac79-4ad3-a8fe-02819e7d3684" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_db8df4ff-1636-4fea-9c07-bd2281fa5cf0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_db8df4ff-1636-4fea-9c07-bd2281fa5cf0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_b2911d0f-79b4-4346-aded-0db45b9a60f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_b2911d0f-79b4-4346-aded-0db45b9a60f9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5031a193-4598-4675-8994-eb1ad95951c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5031a193-4598-4675-8994-eb1ad95951c3" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_e8ad572e-0954-4b14-a21d-5f5dc265a151" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a40832d5-9bf7-4c1e-bf61-ed72465c55cf" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_e8ad572e-0954-4b14-a21d-5f5dc265a151" xlink:type="arc" order="5"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfAmountsRecognizedBeforeRelatedDeferredIncomeTaxesInAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsScheduleOfAmountsRecognizedBeforeRelatedDeferredIncomeTaxesInAccumulatedOtherComprehensiveIncomeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfAmountsRecognizedBeforeRelatedDeferredIncomeTaxesInAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8123ba3a-c87b-4b14-8975-c400db69b7a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9346d127-ceac-49ec-b828-45c2b20ea8c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8123ba3a-c87b-4b14-8975-c400db69b7a0" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9346d127-ceac-49ec-b828-45c2b20ea8c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_19f5790f-aab8-4d56-b242-8924d4029d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_9346d127-ceac-49ec-b828-45c2b20ea8c1" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_19f5790f-aab8-4d56-b242-8924d4029d7f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_19f5790f-aab8-4d56-b242-8924d4029d7f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_19f5790f-aab8-4d56-b242-8924d4029d7f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_19f5790f-aab8-4d56-b242-8924d4029d7f_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8f0b1499-310a-4a79-ad95-32e6afc86cc5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_19f5790f-aab8-4d56-b242-8924d4029d7f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8f0b1499-310a-4a79-ad95-32e6afc86cc5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_02a10ac8-5fab-49a2-a2d9-de6e90a474e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8f0b1499-310a-4a79-ad95-32e6afc86cc5" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_02a10ac8-5fab-49a2-a2d9-de6e90a474e4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_fd60352e-d812-45ef-a860-3d3099dda783" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8f0b1499-310a-4a79-ad95-32e6afc86cc5" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_fd60352e-d812-45ef-a860-3d3099dda783" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_a28cfbe4-37b4-49c7-8b8c-7e2d19dfad0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_8123ba3a-c87b-4b14-8975-c400db69b7a0" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_a28cfbe4-37b4-49c7-8b8c-7e2d19dfad0e" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfPercentageCompositionOfAssetsHeldByPensionPlansDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsScheduleOfPercentageCompositionOfAssetsHeldByPensionPlansDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfPercentageCompositionOfAssetsHeldByPensionPlansDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_4ed598d5-0aa1-49c8-9970-83b05656f9ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1774699a-dbb3-468f-8df7-a3d8abcafeac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_4ed598d5-0aa1-49c8-9970-83b05656f9ea" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1774699a-dbb3-468f-8df7-a3d8abcafeac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ba223ad9-165a-4f9e-88eb-d649cdbbb011" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1774699a-dbb3-468f-8df7-a3d8abcafeac" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ba223ad9-165a-4f9e-88eb-d649cdbbb011" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_ba223ad9-165a-4f9e-88eb-d649cdbbb011_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ba223ad9-165a-4f9e-88eb-d649cdbbb011" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_ba223ad9-165a-4f9e-88eb-d649cdbbb011_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_ba223ad9-165a-4f9e-88eb-d649cdbbb011" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_266602be-09c6-4461-85b8-809a4588ac92" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_266602be-09c6-4461-85b8-809a4588ac92" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CollectiveInvestmentTrustMember_7cfdd79b-a655-4c63-a40c-785e6f436851" xlink:href="tg-20231231.xsd#tg_CollectiveInvestmentTrustMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:to="loc_tg_CollectiveInvestmentTrustMember_7cfdd79b-a655-4c63-a40c-785e6f436851" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_HedgeAndPrivateEquityFundsMember_dac284f3-dee5-4504-867d-06292f5a6b62" xlink:href="tg-20231231.xsd#tg_HedgeAndPrivateEquityFundsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:to="loc_tg_HedgeAndPrivateEquityFundsMember_dac284f3-dee5-4504-867d-06292f5a6b62" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_669a7c1c-c528-4533-865c-85f28121e448" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_94ac8186-5b26-4ef4-9a4c-250b30fd6455" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_669a7c1c-c528-4533-865c-85f28121e448" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_2f8f0608-0ab1-4d35-9f74-16994c16c16b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_4ed598d5-0aa1-49c8-9970-83b05656f9ea" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_2f8f0608-0ab1-4d35-9f74-16994c16c16b" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfPensionPlanAssetsCategorizedByLevelWithinFairValueMeasurementHierarchyDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#RetirementPlansAndOtherPostretirementBenefitsScheduleOfPensionPlanAssetsCategorizedByLevelWithinFairValueMeasurementHierarchyDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/RetirementPlansAndOtherPostretirementBenefitsScheduleOfPensionPlanAssetsCategorizedByLevelWithinFairValueMeasurementHierarchyDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_de65e0ac-448d-4aa0-a428-fbafa0b9cf3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cee90e22-583a-4f8e-be86-4f0c67531fcc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_de65e0ac-448d-4aa0-a428-fbafa0b9cf3d" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cee90e22-583a-4f8e-be86-4f0c67531fcc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d" 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_ScheduleOfDefinedBenefitPlansDisclosuresTable_cee90e22-583a-4f8e-be86-4f0c67531fcc" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d_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_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cd30262f-21d6-4873-9528-5dc8f67f3681" 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_2242c6cc-b97c-4e1f-b6d7-e490bf075e9d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_cd30262f-21d6-4873-9528-5dc8f67f3681" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_17b3df18-1e14-407c-94cc-5c1cafb852d7" 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_cd30262f-21d6-4873-9528-5dc8f67f3681" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_17b3df18-1e14-407c-94cc-5c1cafb852d7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_de20c0a9-401a-4f7e-951c-964197c1af9e" 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_cd30262f-21d6-4873-9528-5dc8f67f3681" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_de20c0a9-401a-4f7e-951c-964197c1af9e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_52eff16c-50e0-4852-9c6b-e9954a9bbe8f" 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_cd30262f-21d6-4873-9528-5dc8f67f3681" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_52eff16c-50e0-4852-9c6b-e9954a9bbe8f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_be2a8d69-521c-4ac6-b7ad-553a72c770df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_cee90e22-583a-4f8e-be86-4f0c67531fcc" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_be2a8d69-521c-4ac6-b7ad-553a72c770df" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_be2a8d69-521c-4ac6-b7ad-553a72c770df_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_be2a8d69-521c-4ac6-b7ad-553a72c770df" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_be2a8d69-521c-4ac6-b7ad-553a72c770df_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_be2a8d69-521c-4ac6-b7ad-553a72c770df" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_fd01e22f-9358-40aa-8a56-128a839075d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_fd01e22f-9358-40aa-8a56-128a839075d2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_43bb8fa6-73e6-45c5-9be1-cada8a0eb98b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_43bb8fa6-73e6-45c5-9be1-cada8a0eb98b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_2e6ecb48-e32c-435c-afd6-6968e7c52d42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_2e6ecb48-e32c-435c-afd6-6968e7c52d42" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_HedgeAndPrivateEquityFundsMember_d740db47-1fc4-4e9b-ae64-6875321f704d" xlink:href="tg-20231231.xsd#tg_HedgeAndPrivateEquityFundsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_tg_HedgeAndPrivateEquityFundsMember_d740db47-1fc4-4e9b-ae64-6875321f704d" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_98e533a3-3a00-4e9b-82ba-929ae5d66707" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_us-gaap_OtherAssetsMember_98e533a3-3a00-4e9b-82ba-929ae5d66707" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TotalInvestmentsMeasuredAtNetAssetValueMember_17ead71b-6214-482d-bdae-819a731aab2c" xlink:href="tg-20231231.xsd#tg_TotalInvestmentsMeasuredAtNetAssetValueMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_tg_TotalInvestmentsMeasuredAtNetAssetValueMember_17ead71b-6214-482d-bdae-819a731aab2c" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TotalPlanAssetsatFairValueMember_6206e273-0294-4f36-b927-79f2beadbcc2" xlink:href="tg-20231231.xsd#tg_TotalPlanAssetsatFairValueMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_3c83abe6-994b-429f-bc52-1fa7974854bd" xlink:to="loc_tg_TotalPlanAssetsatFairValueMember_6206e273-0294-4f36-b927-79f2beadbcc2" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a8d1fb6f-6e7a-48e8-90a9-424283aba55d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_de65e0ac-448d-4aa0-a428-fbafa0b9cf3d" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_a8d1fb6f-6e7a-48e8-90a9-424283aba55d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SecuritiesSoldAndInterestReceivable_71c1d578-ecee-4d9e-a374-643b76cfba67" xlink:href="tg-20231231.xsd#tg_SecuritiesSoldAndInterestReceivable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_de65e0ac-448d-4aa0-a428-fbafa0b9cf3d" xlink:to="loc_tg_SecuritiesSoldAndInterestReceivable_71c1d578-ecee-4d9e-a374-643b76cfba67" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_274c94ea-4a1f-4601-a699-85926f241f4c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_de65e0ac-448d-4aa0-a428-fbafa0b9cf3d" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_274c94ea-4a1f-4601-a699-85926f241f4c" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/OtherIncomeExpenseNetDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#OtherIncomeExpenseNetDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/OtherIncomeExpenseNetDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" 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_67db97f7-ef99-40d7-8328-986f20dc90da" 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_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_us-gaap_StatementTable_67db97f7-ef99-40d7-8328-986f20dc90da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_13445cf8-a540-4e5f-b852-ffedc3ba5d6e" 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_StatementTable_67db97f7-ef99-40d7-8328-986f20dc90da" xlink:to="loc_dei_LegalEntityAxis_13445cf8-a540-4e5f-b852-ffedc3ba5d6e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_13445cf8-a540-4e5f-b852-ffedc3ba5d6e_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_13445cf8-a540-4e5f-b852-ffedc3ba5d6e" xlink:to="loc_dei_EntityDomain_13445cf8-a540-4e5f-b852-ffedc3ba5d6e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b95d6239-0a72-45e4-9398-b12cdf8fca72" 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_13445cf8-a540-4e5f-b852-ffedc3ba5d6e" xlink:to="loc_dei_EntityDomain_b95d6239-0a72-45e4-9398-b12cdf8fca72" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_KaleoMember_6fb8b878-2d76-40be-b925-3796a6fb3925" xlink:href="tg-20231231.xsd#tg_KaleoMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_b95d6239-0a72-45e4-9398-b12cdf8fca72" xlink:to="loc_tg_KaleoMember_6fb8b878-2d76-40be-b925-3796a6fb3925" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_UnrealizedGainLossonInvestmentskaleo_71f6509d-fa61-4b97-ae84-a80591663217" xlink:href="tg-20231231.xsd#tg_UnrealizedGainLossonInvestmentskaleo"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_tg_UnrealizedGainLossonInvestmentskaleo_71f6509d-fa61-4b97-ae84-a80591663217" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_BrazilOneTimeTaxCreditPISCOFINS_60e05329-5797-4215-9b32-c3ff0ee8298c" xlink:href="tg-20231231.xsd#tg_BrazilOneTimeTaxCreditPISCOFINS"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_tg_BrazilOneTimeTaxCreditPISCOFINS_60e05329-5797-4215-9b32-c3ff0ee8298c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingExpense_f212f21d-fd74-4e44-9a26-6471ed6728d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_us-gaap_OtherNonoperatingExpense_f212f21d-fd74-4e44-9a26-6471ed6728d7" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GroupAnnuityContractPremiumExpense_59a69549-c367-4288-8f12-a1a2231fa8e7" xlink:href="tg-20231231.xsd#tg_GroupAnnuityContractPremiumExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_tg_GroupAnnuityContractPremiumExpense_59a69549-c367-4288-8f12-a1a2231fa8e7" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherNonoperatingIncomeExpenseNetOther_55f64399-37fa-499b-bb25-8cc8ceed582e" xlink:href="tg-20231231.xsd#tg_OtherNonoperatingIncomeExpenseNetOther"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_tg_OtherNonoperatingIncomeExpenseNetOther_55f64399-37fa-499b-bb25-8cc8ceed582e" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OtherNonoperatingIncomeExpenseNetTotal_d48aa84f-d45e-46e5-b98a-849be1c6430e" xlink:href="tg-20231231.xsd#tg_OtherNonoperatingIncomeExpenseNetTotal"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_tg_OtherNonoperatingIncomeExpenseNetTotal_d48aa84f-d45e-46e5-b98a-849be1c6430e" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeDividend_c07db843-78cc-4ddd-9a9b-f3034cf776fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeDividend"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_us-gaap_InvestmentIncomeDividend_c07db843-78cc-4ddd-9a9b-f3034cf776fc" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfInvestmentProjects_07e84c64-c855-4475-916f-eae1f7e27bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfInvestmentProjects"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_95305c1f-21e1-42ca-b115-45ceb757d91f" xlink:to="loc_us-gaap_ProceedsFromSaleOfInvestmentProjects_07e84c64-c855-4475-916f-eae1f7e27bd3" xlink:type="arc" order="7"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#FinancialInstrumentsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_b8dfbddc-078d-4715-8f1e-45fc2638e44d" 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_393d766f-12ac-4183-92d3-b65e2ea83801" 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_b8dfbddc-078d-4715-8f1e-45fc2638e44d" xlink:to="loc_us-gaap_DerivativeTable_393d766f-12ac-4183-92d3-b65e2ea83801" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_dc0f1410-2756-4c54-b4bb-1204c7742d65" 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_393d766f-12ac-4183-92d3-b65e2ea83801" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_dc0f1410-2756-4c54-b4bb-1204c7742d65" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_dc0f1410-2756-4c54-b4bb-1204c7742d65_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_dc0f1410-2756-4c54-b4bb-1204c7742d65" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_dc0f1410-2756-4c54-b4bb-1204c7742d65_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_07bb0fef-1b33-437e-8391-8792d9564966" 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_dc0f1410-2756-4c54-b4bb-1204c7742d65" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_07bb0fef-1b33-437e-8391-8792d9564966" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumFuturesContractsMember_ac1deb69-7f9d-488b-a424-27741b177fdc" xlink:href="tg-20231231.xsd#tg_AluminumFuturesContractsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_07bb0fef-1b33-437e-8391-8792d9564966" xlink:to="loc_tg_AluminumFuturesContractsMember_ac1deb69-7f9d-488b-a424-27741b177fdc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DerivativeNotionalAmountNet_63363f1c-b437-400d-8af0-5a2e2165a9eb" xlink:href="tg-20231231.xsd#tg_DerivativeNotionalAmountNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_b8dfbddc-078d-4715-8f1e-45fc2638e44d" xlink:to="loc_tg_DerivativeNotionalAmountNet_63363f1c-b437-400d-8af0-5a2e2165a9eb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountMass_e08a6a9a-18e9-4665-9b73-1cdf96a70e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountMass"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_b8dfbddc-078d-4715-8f1e-45fc2638e44d" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountMass_e08a6a9a-18e9-4665-9b73-1cdf96a70e3e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AnnualNetCostsMismatchTranslationExposureRealvsUSDollar_351f1ee5-5453-45ad-809e-e7fa53487778" xlink:href="tg-20231231.xsd#tg_AnnualNetCostsMismatchTranslationExposureRealvsUSDollar"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_b8dfbddc-078d-4715-8f1e-45fc2638e44d" xlink:to="loc_tg_AnnualNetCostsMismatchTranslationExposureRealvsUSDollar_351f1ee5-5453-45ad-809e-e7fa53487778" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_b8d7984e-f377-4147-a3cd-08f7a4fb01a6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_b8dfbddc-078d-4715-8f1e-45fc2638e44d" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_b8d7984e-f377-4147-a3cd-08f7a4fb01a6" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/FinancialInstrumentsSummaryOfLocationAndFairValueOfDerivativeFinancialInstrumentsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#FinancialInstrumentsSummaryOfLocationAndFairValueOfDerivativeFinancialInstrumentsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/FinancialInstrumentsSummaryOfLocationAndFairValueOfDerivativeFinancialInstrumentsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_5e32160d-b42c-426d-91ac-00bec14d487a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8cec6fa2-dd61-4131-ab3a-aecd42e4e429" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_5e32160d-b42c-426d-91ac-00bec14d487a" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8cec6fa2-dd61-4131-ab3a-aecd42e4e429" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_1d212aa2-2c82-4b20-bcf9-56fbf730a779" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8cec6fa2-dd61-4131-ab3a-aecd42e4e429" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_1d212aa2-2c82-4b20-bcf9-56fbf730a779" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1d212aa2-2c82-4b20-bcf9-56fbf730a779_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_1d212aa2-2c82-4b20-bcf9-56fbf730a779" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1d212aa2-2c82-4b20-bcf9-56fbf730a779_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5733052b-cffd-4725-a7d3-6cc61f334432" 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_1d212aa2-2c82-4b20-bcf9-56fbf730a779" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5733052b-cffd-4725-a7d3-6cc61f334432" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumFuturesContractsMember_e5b09f68-fad4-4de5-9740-0a102f860323" xlink:href="tg-20231231.xsd#tg_AluminumFuturesContractsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_5733052b-cffd-4725-a7d3-6cc61f334432" xlink:to="loc_tg_AluminumFuturesContractsMember_e5b09f68-fad4-4de5-9740-0a102f860323" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_3667043b-29f6-468b-94c9-6e6639c24140" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8cec6fa2-dd61-4131-ab3a-aecd42e4e429" xlink:to="loc_us-gaap_HedgingDesignationAxis_3667043b-29f6-468b-94c9-6e6639c24140" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_3667043b-29f6-468b-94c9-6e6639c24140_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_3667043b-29f6-468b-94c9-6e6639c24140" xlink:to="loc_us-gaap_HedgingDesignationDomain_3667043b-29f6-468b-94c9-6e6639c24140_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_07a46e29-c041-486e-a2f0-6518f90c18c6" 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_3667043b-29f6-468b-94c9-6e6639c24140" xlink:to="loc_us-gaap_HedgingDesignationDomain_07a46e29-c041-486e-a2f0-6518f90c18c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_f4abddeb-7520-445d-8616-b8b946413481" 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_07a46e29-c041-486e-a2f0-6518f90c18c6" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_f4abddeb-7520-445d-8616-b8b946413481" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8cec6fa2-dd61-4131-ab3a-aecd42e4e429" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_af302976-4679-4376-a200-f1ff9f591538" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_90e3200c-bdf4-4b1a-b5fc-5ced2ab03abd" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_af302976-4679-4376-a200-f1ff9f591538" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_d3950d3a-750d-4057-a17e-0c5ea5953c6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_af302976-4679-4376-a200-f1ff9f591538" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_d3950d3a-750d-4057-a17e-0c5ea5953c6a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AccruedExpensesMember_988129ea-b626-4f1c-b441-bed52e83a5d8" xlink:href="tg-20231231.xsd#tg_AccruedExpensesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_af302976-4679-4376-a200-f1ff9f591538" xlink:to="loc_tg_AccruedExpensesMember_988129ea-b626-4f1c-b441-bed52e83a5d8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_51e08428-58e4-4b84-b588-753e4da0a72c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_af302976-4679-4376-a200-f1ff9f591538" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_51e08428-58e4-4b84-b588-753e4da0a72c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_df81c7d7-9651-47d5-9e0f-e40d9fc5b5ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_5e32160d-b42c-426d-91ac-00bec14d487a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_df81c7d7-9651-47d5-9e0f-e40d9fc5b5ff" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_945f1e54-741f-4f8b-93a5-7cca9dec2dff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_5e32160d-b42c-426d-91ac-00bec14d487a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_945f1e54-741f-4f8b-93a5-7cca9dec2dff" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_e2d73691-b242-4614-8282-ae5311ca536e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_5e32160d-b42c-426d-91ac-00bec14d487a" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_e2d73691-b242-4614-8282-ae5311ca536e" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsTerphaneDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsTerphaneDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsTerphaneDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_88d1bf82-aedd-42e3-a98f-76fe287ec3ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_b34d8b16-417c-4ec6-a1a2-137d89c33549" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_88d1bf82-aedd-42e3-a98f-76fe287ec3ae" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_b34d8b16-417c-4ec6-a1a2-137d89c33549" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CashFlowHedgeMaturityDateAxis_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787" xlink:href="tg-20231231.xsd#tg_CashFlowHedgeMaturityDateAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_b34d8b16-417c-4ec6-a1a2-137d89c33549" xlink:to="loc_tg_CashFlowHedgeMaturityDateAxis_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CashFlowHedgeMaturityDateDomain_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787_default" xlink:href="tg-20231231.xsd#tg_CashFlowHedgeMaturityDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_tg_CashFlowHedgeMaturityDateAxis_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787" xlink:to="loc_tg_CashFlowHedgeMaturityDateDomain_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:href="tg-20231231.xsd#tg_CashFlowHedgeMaturityDateDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_tg_CashFlowHedgeMaturityDateAxis_4a674b8e-e9d8-43bc-b0ae-ab6a3b74f787" xlink:to="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Jan24Member_8bc703c2-aeb5-4afc-9d3a-9b907ef65f9f" xlink:href="tg-20231231.xsd#tg_Jan24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Jan24Member_8bc703c2-aeb5-4afc-9d3a-9b907ef65f9f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Feb24Member_83b0937a-dbde-422b-9ec5-22031dd822f6" xlink:href="tg-20231231.xsd#tg_Feb24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Feb24Member_83b0937a-dbde-422b-9ec5-22031dd822f6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Mar24Member_3ff14542-4940-4122-88f1-7665b024dae0" xlink:href="tg-20231231.xsd#tg_Mar24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Mar24Member_3ff14542-4940-4122-88f1-7665b024dae0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Apr24Member_16491f3c-c051-4433-a7c9-8f7fda243569" xlink:href="tg-20231231.xsd#tg_Apr24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Apr24Member_16491f3c-c051-4433-a7c9-8f7fda243569" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_May24Member_5534bc08-5cfd-4409-95ed-75f20a62ea55" xlink:href="tg-20231231.xsd#tg_May24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_May24Member_5534bc08-5cfd-4409-95ed-75f20a62ea55" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Jun24Member_800bc2f7-8d2f-4c07-8e89-14ab80393c70" xlink:href="tg-20231231.xsd#tg_Jun24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Jun24Member_800bc2f7-8d2f-4c07-8e89-14ab80393c70" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Jul24Member_234780e6-b1e2-4cd3-9946-9f23f37a988c" xlink:href="tg-20231231.xsd#tg_Jul24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Jul24Member_234780e6-b1e2-4cd3-9946-9f23f37a988c" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Aug24Member_1818d6d2-8895-4d0b-8e5c-1f4c60cc58ab" xlink:href="tg-20231231.xsd#tg_Aug24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Aug24Member_1818d6d2-8895-4d0b-8e5c-1f4c60cc58ab" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Sep24Member_d7d4eb31-93cb-41f3-bce5-0422961e7dfb" xlink:href="tg-20231231.xsd#tg_Sep24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Sep24Member_d7d4eb31-93cb-41f3-bce5-0422961e7dfb" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Oct24Member_f150b9f7-82fc-47c7-9367-85846e7e4b3b" xlink:href="tg-20231231.xsd#tg_Oct24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Oct24Member_f150b9f7-82fc-47c7-9367-85846e7e4b3b" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Nov24Member_2772024b-d61e-4535-80c5-d3cd21f73eaa" xlink:href="tg-20231231.xsd#tg_Nov24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Nov24Member_2772024b-d61e-4535-80c5-d3cd21f73eaa" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_Dec24Member_697d597f-9fc8-46a2-aa2f-5369728acfa4" xlink:href="tg-20231231.xsd#tg_Dec24Member"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_CashFlowHedgeMaturityDateDomain_9cafa853-68ce-4621-83ef-9c50a57d4820" xlink:to="loc_tg_Dec24Member_697d597f-9fc8-46a2-aa2f-5369728acfa4" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_816919da-388b-4b5e-b72a-2130d42de7c2" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_b34d8b16-417c-4ec6-a1a2-137d89c33549" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_816919da-388b-4b5e-b72a-2130d42de7c2" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_816919da-388b-4b5e-b72a-2130d42de7c2_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_816919da-388b-4b5e-b72a-2130d42de7c2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_816919da-388b-4b5e-b72a-2130d42de7c2_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e31beff1-fc36-47c9-a8ca-8703dac21a50" 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_816919da-388b-4b5e-b72a-2130d42de7c2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e31beff1-fc36-47c9-a8ca-8703dac21a50" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TerphaneLtdaMember_c4cae894-980a-43eb-9a1d-4b1c04b87ba9" xlink:href="tg-20231231.xsd#tg_TerphaneLtdaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e31beff1-fc36-47c9-a8ca-8703dac21a50" xlink:to="loc_tg_TerphaneLtdaMember_c4cae894-980a-43eb-9a1d-4b1c04b87ba9" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_753b2929-027a-45b5-9953-87a3fd58f628" 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_DerivativesFairValueLineItems_88d1bf82-aedd-42e3-a98f-76fe287ec3ae" xlink:to="loc_us-gaap_DerivativeNotionalAmount_753b2929-027a-45b5-9953-87a3fd58f628" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyExchangeRateTranslation1_9cccf8b6-d506-4e2a-aca1-9d316f0b6217" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCurrencyExchangeRateTranslation1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_88d1bf82-aedd-42e3-a98f-76fe287ec3ae" xlink:to="loc_us-gaap_ForeignCurrencyExchangeRateTranslation1_9cccf8b6-d506-4e2a-aca1-9d316f0b6217" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PercentageofCoverageUsingCashFlowHedges_4b2ec12a-08d0-44fd-959d-e101c464b344" xlink:href="tg-20231231.xsd#tg_PercentageofCoverageUsingCashFlowHedges"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_88d1bf82-aedd-42e3-a98f-76fe287ec3ae" xlink:to="loc_tg_PercentageofCoverageUsingCashFlowHedges_4b2ec12a-08d0-44fd-959d-e101c464b344" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/FinancialInstrumentsFinancialInstrumentsSummaryofLocationandFairValueofCurrencyForwardDerivativeFinancialInstrumentsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_8ae81a35-e175-455d-901f-1559923fc417" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4237ceca-d4c5-4378-8526-1dfdddab063e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_8ae81a35-e175-455d-901f-1559923fc417" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4237ceca-d4c5-4378-8526-1dfdddab063e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_ca70dc15-7bba-4203-91f8-8019eaae428b" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4237ceca-d4c5-4378-8526-1dfdddab063e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_ca70dc15-7bba-4203-91f8-8019eaae428b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ca70dc15-7bba-4203-91f8-8019eaae428b_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_ca70dc15-7bba-4203-91f8-8019eaae428b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ca70dc15-7bba-4203-91f8-8019eaae428b_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0961275a-0a0e-411e-abd5-b490a49f2ee8" 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_ca70dc15-7bba-4203-91f8-8019eaae428b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0961275a-0a0e-411e-abd5-b490a49f2ee8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_d5124f47-041c-42f9-a9ff-1271c8149a40" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0961275a-0a0e-411e-abd5-b490a49f2ee8" xlink:to="loc_tg_FlexiblePackagingFilmsMember_d5124f47-041c-42f9-a9ff-1271c8149a40" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_deb9f4d1-7899-4768-8c6e-6d33d7583fff" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4237ceca-d4c5-4378-8526-1dfdddab063e" xlink:to="loc_us-gaap_HedgingDesignationAxis_deb9f4d1-7899-4768-8c6e-6d33d7583fff" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_deb9f4d1-7899-4768-8c6e-6d33d7583fff_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_deb9f4d1-7899-4768-8c6e-6d33d7583fff" xlink:to="loc_us-gaap_HedgingDesignationDomain_deb9f4d1-7899-4768-8c6e-6d33d7583fff_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_0e85e0d5-3812-46d0-b3b7-31912f2c738f" 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_deb9f4d1-7899-4768-8c6e-6d33d7583fff" xlink:to="loc_us-gaap_HedgingDesignationDomain_0e85e0d5-3812-46d0-b3b7-31912f2c738f" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_87de7e3d-177c-4027-8688-5717c28ad7f7" 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_0e85e0d5-3812-46d0-b3b7-31912f2c738f" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_87de7e3d-177c-4027-8688-5717c28ad7f7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_0d90d4b0-728e-4413-a242-ceb8f9ca9167" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4237ceca-d4c5-4378-8526-1dfdddab063e" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_0d90d4b0-728e-4413-a242-ceb8f9ca9167" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0d90d4b0-728e-4413-a242-ceb8f9ca9167_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0d90d4b0-728e-4413-a242-ceb8f9ca9167" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0d90d4b0-728e-4413-a242-ceb8f9ca9167_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_b6801827-9683-4a26-8f84-5e50a7106e70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_0d90d4b0-728e-4413-a242-ceb8f9ca9167" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_b6801827-9683-4a26-8f84-5e50a7106e70" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_02a37087-da7b-45a2-8a12-f7f82178786f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_b6801827-9683-4a26-8f84-5e50a7106e70" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_02a37087-da7b-45a2-8a12-f7f82178786f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_d4fdc587-6f13-4fbd-b296-d55e4e3ca1e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_b6801827-9683-4a26-8f84-5e50a7106e70" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_d4fdc587-6f13-4fbd-b296-d55e4e3ca1e2" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_f8a705f4-df3b-496f-b9ff-5db9dd950b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_b6801827-9683-4a26-8f84-5e50a7106e70" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_f8a705f4-df3b-496f-b9ff-5db9dd950b8c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_a997052a-9824-495d-8f4d-bf31c1f195e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_8ae81a35-e175-455d-901f-1559923fc417" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_a997052a-9824-495d-8f4d-bf31c1f195e4" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_81ea6de6-a015-41e9-bbd5-472fec64065a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_8ae81a35-e175-455d-901f-1559923fc417" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_81ea6de6-a015-41e9-bbd5-472fec64065a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_5aad630f-c029-43a8-bf65-8aecc003f212" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_8ae81a35-e175-455d-901f-1559923fc417" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_5aad630f-c029-43a8-bf65-8aecc003f212" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/FinancialInstrumentsScheduleOfPretaxEffectOnNetIncomeLossAndOtherComprehensiveIncomeLossOfDerivativeInstrumentsClassifiedAsCashFlowHedgesDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#FinancialInstrumentsScheduleOfPretaxEffectOnNetIncomeLossAndOtherComprehensiveIncomeLossOfDerivativeInstrumentsClassifiedAsCashFlowHedgesDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/FinancialInstrumentsScheduleOfPretaxEffectOnNetIncomeLossAndOtherComprehensiveIncomeLossOfDerivativeInstrumentsClassifiedAsCashFlowHedgesDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_0243f27d-2bc3-423a-b60b-a63a0f6326e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_0243f27d-2bc3-423a-b60b-a63a0f6326e6" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_41ac2f1b-b49c-4af5-90ac-5cde63f692b8" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_41ac2f1b-b49c-4af5-90ac-5cde63f692b8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_41ac2f1b-b49c-4af5-90ac-5cde63f692b8_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_41ac2f1b-b49c-4af5-90ac-5cde63f692b8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_41ac2f1b-b49c-4af5-90ac-5cde63f692b8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7b1b74d8-1977-4cd1-8fa3-e236a1c6d745" 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_41ac2f1b-b49c-4af5-90ac-5cde63f692b8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7b1b74d8-1977-4cd1-8fa3-e236a1c6d745" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_8622b5a0-bf97-4095-ad10-8b8a6e8f5201" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_7b1b74d8-1977-4cd1-8fa3-e236a1c6d745" xlink:to="loc_us-gaap_CostOfSalesMember_8622b5a0-bf97-4095-ad10-8b8a6e8f5201" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_93872598-8f5b-46bd-921e-327ef3d70345" 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_7b1b74d8-1977-4cd1-8fa3-e236a1c6d745" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_93872598-8f5b-46bd-921e-327ef3d70345" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_5f915615-5742-402b-acf6-4f7634652eb0" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_5f915615-5742-402b-acf6-4f7634652eb0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5f915615-5742-402b-acf6-4f7634652eb0_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_5f915615-5742-402b-acf6-4f7634652eb0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5f915615-5742-402b-acf6-4f7634652eb0_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b91a7030-cbe3-4f60-ab71-bc72e8c632dd" 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_5f915615-5742-402b-acf6-4f7634652eb0" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b91a7030-cbe3-4f60-ab71-bc72e8c632dd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumFuturesContractsMember_9286f6ee-bae3-46ab-8be3-665b09b10292" xlink:href="tg-20231231.xsd#tg_AluminumFuturesContractsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b91a7030-cbe3-4f60-ab71-bc72e8c632dd" xlink:to="loc_tg_AluminumFuturesContractsMember_9286f6ee-bae3-46ab-8be3-665b09b10292" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_5b633607-29fa-4af9-992f-da865d431c84" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b91a7030-cbe3-4f60-ab71-bc72e8c632dd" xlink:to="loc_tg_FlexiblePackagingFilmsMember_5b633607-29fa-4af9-992f-da865d431c84" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ForeignCurrencyForwardContractsMember_54dae90a-21b1-42ff-9eda-43ab6a0dcd2e" xlink:href="tg-20231231.xsd#tg_ForeignCurrencyForwardContractsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b91a7030-cbe3-4f60-ab71-bc72e8c632dd" xlink:to="loc_tg_ForeignCurrencyForwardContractsMember_54dae90a-21b1-42ff-9eda-43ab6a0dcd2e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_0aa8d9af-23c4-4702-80b7-8d90a3043f97" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_0aa8d9af-23c4-4702-80b7-8d90a3043f97" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_0aa8d9af-23c4-4702-80b7-8d90a3043f97_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_0aa8d9af-23c4-4702-80b7-8d90a3043f97" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_0aa8d9af-23c4-4702-80b7-8d90a3043f97_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_bef4192c-9f0c-4bd9-8bbd-23d0945a6536" 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_0aa8d9af-23c4-4702-80b7-8d90a3043f97" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_bef4192c-9f0c-4bd9-8bbd-23d0945a6536" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_6a26903a-4035-41c7-8458-a26005720f28" 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_bef4192c-9f0c-4bd9-8bbd-23d0945a6536" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_6a26903a-4035-41c7-8458-a26005720f28" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_260a727b-dd9d-4639-ad60-f3793d3f24dd" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_e7f35fa6-42e1-47e8-8b37-e87f33fe3326" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_260a727b-dd9d-4639-ad60-f3793d3f24dd" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_260a727b-dd9d-4639-ad60-f3793d3f24dd_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_260a727b-dd9d-4639-ad60-f3793d3f24dd" xlink:to="loc_us-gaap_EquityComponentDomain_260a727b-dd9d-4639-ad60-f3793d3f24dd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a559bd1d-cb71-4ae7-b367-71ddc66c69c5" 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_260a727b-dd9d-4639-ad60-f3793d3f24dd" xlink:to="loc_us-gaap_EquityComponentDomain_a559bd1d-cb71-4ae7-b367-71ddc66c69c5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_f4c0bfe8-8cd2-47da-93f3-fd37e3c0bf4b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a559bd1d-cb71-4ae7-b367-71ddc66c69c5" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_f4c0bfe8-8cd2-47da-93f3-fd37e3c0bf4b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_791320d9-95c0-46d2-9763-a020dea72765" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_0243f27d-2bc3-423a-b60b-a63a0f6326e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_791320d9-95c0-46d2-9763-a020dea72765" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_830eeba0-7358-4320-b519-e5ac25fe49c0" 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_DerivativesFairValueLineItems_0243f27d-2bc3-423a-b60b-a63a0f6326e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_830eeba0-7358-4320-b519-e5ac25fe49c0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_b89a3278-9fe3-43af-a2f3-74c1cd6f277d" 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_DerivativesFairValueLineItems_0243f27d-2bc3-423a-b60b-a63a0f6326e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_b89a3278-9fe3-43af-a2f3-74c1cd6f277d" xlink:type="arc" order="2"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_b36cc9b2-54da-4dfe-aece-3e2265fe32fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_b36cc9b2-54da-4dfe-aece-3e2265fe32fd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_f8a92c8f-ffae-4731-b8b1-eb820861f87e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_b36cc9b2-54da-4dfe-aece-3e2265fe32fd" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_f8a92c8f-ffae-4731-b8b1-eb820861f87e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_f8a92c8f-ffae-4731-b8b1-eb820861f87e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_f8a92c8f-ffae-4731-b8b1-eb820861f87e" xlink:to="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_f8a92c8f-ffae-4731-b8b1-eb820861f87e_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_f82cfc5a-5e4e-4f76-b5bc-7113d3a71823" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_f8a92c8f-ffae-4731-b8b1-eb820861f87e" xlink:to="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_f82cfc5a-5e4e-4f76-b5bc-7113d3a71823" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NonVestedRestrictedStockAndOtherStockBasedAwardsMember_16f13313-a2fc-434b-a9b9-cf16cd52d245" xlink:href="tg-20231231.xsd#tg_NonVestedRestrictedStockAndOtherStockBasedAwardsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_f82cfc5a-5e4e-4f76-b5bc-7113d3a71823" xlink:to="loc_tg_NonVestedRestrictedStockAndOtherStockBasedAwardsMember_16f13313-a2fc-434b-a9b9-cf16cd52d245" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5f42a6b6-5262-4821-837c-bb390a804b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5f42a6b6-5262-4821-837c-bb390a804b8c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OptionsMayBeGrantedToPurchaseSpecifiedNumberOfCommonSharesUnderStockOptionPlanMaximumTerm_1b09474c-90b0-49ed-938d-e195f600bb3b" xlink:href="tg-20231231.xsd#tg_OptionsMayBeGrantedToPurchaseSpecifiedNumberOfCommonSharesUnderStockOptionPlanMaximumTerm"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_tg_OptionsMayBeGrantedToPurchaseSpecifiedNumberOfCommonSharesUnderStockOptionPlanMaximumTerm_1b09474c-90b0-49ed-938d-e195f600bb3b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_9d21dffb-95f5-4685-88fd-017421df9fae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_9d21dffb-95f5-4685-88fd-017421df9fae" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_2fb05d8a-db51-45cd-8f63-acd508f6adba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_2fb05d8a-db51-45cd-8f63-acd508f6adba" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_9752f640-da64-4793-8bb8-ad73354053ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_9752f640-da64-4793-8bb8-ad73354053ce" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_37366a98-1500-4cee-8b76-65ff3e843c06" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_37366a98-1500-4cee-8b76-65ff3e843c06" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_31f64b0a-438d-457b-af8f-be9253b8c18d" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_31f64b0a-438d-457b-af8f-be9253b8c18d" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_8ddd4d2d-4667-4334-a4a1-46aecbc0fbc1" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_af2f2130-8031-4871-8832-16b9b870e45b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_8ddd4d2d-4667-4334-a4a1-46aecbc0fbc1" xlink:type="arc" order="7"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfStockOptionsOutstandingDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansSummaryOfStockOptionsOutstandingDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfStockOptionsOutstandingDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_25747f15-e5ea-4bfd-9b4f-9844390b3a33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_f02b8cfd-accf-4025-abc4-e52917d7c08d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_25747f15-e5ea-4bfd-9b4f-9844390b3a33" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_f02b8cfd-accf-4025-abc4-e52917d7c08d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a61d0d97-46a1-426e-8acb-817acca982cb" 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_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_f02b8cfd-accf-4025-abc4-e52917d7c08d" xlink:to="loc_srt_RangeAxis_a61d0d97-46a1-426e-8acb-817acca982cb" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a61d0d97-46a1-426e-8acb-817acca982cb_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_a61d0d97-46a1-426e-8acb-817acca982cb" xlink:to="loc_srt_RangeMember_a61d0d97-46a1-426e-8acb-817acca982cb_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8f0f8812-a7b5-4774-b466-46d3a5917001" 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_a61d0d97-46a1-426e-8acb-817acca982cb" xlink:to="loc_srt_RangeMember_8f0f8812-a7b5-4774-b466-46d3a5917001" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3211cd9e-5a80-4d67-be55-b58e8a73ea2a" 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_8f0f8812-a7b5-4774-b466-46d3a5917001" xlink:to="loc_srt_MinimumMember_3211cd9e-5a80-4d67-be55-b58e8a73ea2a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8ace5835-a41b-4bab-9489-7808fcf290fc" 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_8f0f8812-a7b5-4774-b466-46d3a5917001" xlink:to="loc_srt_MaximumMember_8ace5835-a41b-4bab-9489-7808fcf290fc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_25747f15-e5ea-4bfd-9b4f-9844390b3a33" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_9d3ba54a-f174-4b06-aa34-3b67ed787027" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_9d3ba54a-f174-4b06-aa34-3b67ed787027" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_ef3b603d-2592-4631-a02b-b245bcf8f111" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_ef3b603d-2592-4631-a02b-b245bcf8f111" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_eb6325c6-72a0-43fb-86d8-a93a47ef8fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_eb6325c6-72a0-43fb-86d8-a93a47ef8fb8" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_a20bb1f2-732c-4e46-a0cf-be0e4601c4ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_92ef7e3b-703e-4564-9a66-6c8550c6a17a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_a20bb1f2-732c-4e46-a0cf-be0e4601c4ef" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_def7b49a-631a-41cd-98e0-4c552d03707c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:href="tg-20231231.xsd#tg_OptionExercisePriceShareRangeAbstract"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_25747f15-e5ea-4bfd-9b4f-9844390b3a33" xlink:to="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice_55e67ade-e035-4962-afdf-9a6d0ffacca8" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice_55e67ade-e035-4962-afdf-9a6d0ffacca8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice_b1beb87d-de3c-45be-b884-f98c3af5e4b0" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice_b1beb87d-de3c-45be-b884-f98c3af5e4b0" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice_ce6ecb5d-736d-4019-a6f7-8173d4c014c3" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice_ce6ecb5d-736d-4019-a6f7-8173d4c014c3" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice_1313bd72-10a8-4513-a75e-942463b45e04" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_OptionExercisePriceShareRangeAbstract_9680ba80-e464-47cc-a18a-a7cb9047d64c" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice_1313bd72-10a8-4513-a75e-942463b45e04" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice_cc0e33ce-60d4-476c-ba70-37888b257e78" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_25747f15-e5ea-4bfd-9b4f-9844390b3a33" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_d06e405c-d057-49df-96ea-6c73e8bc5a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_d06e405c-d057-49df-96ea-6c73e8bc5a8c" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_0f7a1459-57df-4322-9a25-a67c592a64bb" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_0f7a1459-57df-4322-9a25-a67c592a64bb" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_85e9abdc-fac2-49f7-a1dd-9ecb1f7f987d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_85e9abdc-fac2-49f7-a1dd-9ecb1f7f987d" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_d6c0f6d0-9a4c-40d7-b378-c23135370f00" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_50d9d627-0fa4-46cb-805d-023a6a3624db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_d6c0f6d0-9a4c-40d7-b378-c23135370f00" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_c1c8ccca-b7b1-4345-9cce-ddaf83f12ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryofAssumptionsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansSummaryofAssumptionsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryofAssumptionsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_7a7414ad-1ec5-4ad1-832a-f33ff8b0bcf1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_7a7414ad-1ec5-4ad1-832a-f33ff8b0bcf1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_3c6a6174-cdb0-4e49-b73f-2ff964b99b41" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_7a7414ad-1ec5-4ad1-832a-f33ff8b0bcf1" xlink:to="loc_srt_TitleOfIndividualAxis_3c6a6174-cdb0-4e49-b73f-2ff964b99b41" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3c6a6174-cdb0-4e49-b73f-2ff964b99b41_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_3c6a6174-cdb0-4e49-b73f-2ff964b99b41" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3c6a6174-cdb0-4e49-b73f-2ff964b99b41_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_913e7cfc-5871-456d-9129-3a3831f509f3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_3c6a6174-cdb0-4e49-b73f-2ff964b99b41" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_913e7cfc-5871-456d-9129-3a3831f509f3" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_OfficerMember_c1e0b1de-6a40-4ef8-a2d0-3cd4bd1b0a63" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OfficerMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_913e7cfc-5871-456d-9129-3a3831f509f3" xlink:to="loc_srt_OfficerMember_c1e0b1de-6a40-4ef8-a2d0-3cd4bd1b0a63" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3d567d00-4738-465a-ac1b-49404004dad3" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3d567d00-4738-465a-ac1b-49404004dad3" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_d4babdd2-a78d-47a1-90bb-fe48b8d70276" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_d4babdd2-a78d-47a1-90bb-fe48b8d70276" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_a121023d-35f1-45a1-8e64-93e23d53287e" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_a121023d-35f1-45a1-8e64-93e23d53287e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_8f92947f-a5b6-4b72-82e8-7ffca1ecfc25" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_8f92947f-a5b6-4b72-82e8-7ffca1ecfc25" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1675d541-e281-4a35-a300-1b3023d5f5be" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1675d541-e281-4a35-a300-1b3023d5f5be" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_893f249d-a167-459c-99a4-52e2e484053d" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_893f249d-a167-459c-99a4-52e2e484053d" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue_faf07da1-0a70-4c7c-bb48-2e43850ebb71" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_847a81b6-ee4f-44ef-9fe1-589022c7fc79" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue_faf07da1-0a70-4c7c-bb48-2e43850ebb71" xlink:type="arc" order="6"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnStockOptionsOutstandingAndExercisableDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnStockOptionsOutstandingAndExercisableDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnStockOptionsOutstandingAndExercisableDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59ee6624-efcf-43fc-85b0-bdd2d144154d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59ee6624-efcf-43fc-85b0-bdd2d144154d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_bc9324a2-7e9f-4967-a305-912363e253f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_59ee6624-efcf-43fc-85b0-bdd2d144154d" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_bc9324a2-7e9f-4967-a305-912363e253f0" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_bc9324a2-7e9f-4967-a305-912363e253f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_bc9324a2-7e9f-4967-a305-912363e253f0" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_bc9324a2-7e9f-4967-a305-912363e253f0_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_1bb12890-d2f7-4872-ad73-8d35e59e1963" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_bc9324a2-7e9f-4967-a305-912363e253f0" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_1bb12890-d2f7-4872-ad73-8d35e59e1963" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ExercisePricesRangeOneMember_5ec734b6-b6c0-44fe-bc47-3de248b8883c" xlink:href="tg-20231231.xsd#tg_ExercisePricesRangeOneMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_1bb12890-d2f7-4872-ad73-8d35e59e1963" xlink:to="loc_tg_ExercisePricesRangeOneMember_5ec734b6-b6c0-44fe-bc47-3de248b8883c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ExercisePricesRangeTwoMember_f56193db-bcde-4824-bd1a-ac852fb0a8fc" xlink:href="tg-20231231.xsd#tg_ExercisePricesRangeTwoMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_1bb12890-d2f7-4872-ad73-8d35e59e1963" xlink:to="loc_tg_ExercisePricesRangeTwoMember_f56193db-bcde-4824-bd1a-ac852fb0a8fc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_d42fc9bf-9c70-46b0-897d-51227cfc8acb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_d42fc9bf-9c70-46b0-897d-51227cfc8acb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ce66e767-edf3-4fb4-b241-3a0dd9815d58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ce66e767-edf3-4fb4-b241-3a0dd9815d58" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_ce6dd03a-61eb-4db8-ace8-55790acbd4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_ce6dd03a-61eb-4db8-ace8-55790acbd4b5" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_54209d45-b9bd-4d74-9497-c73db2c81001" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_54209d45-b9bd-4d74-9497-c73db2c81001" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_3453606a-40e9-4bba-8f22-8a25c605b158" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_3453606a-40e9-4bba-8f22-8a25c605b158" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_57f295f2-5091-48a2-a214-3f8b4c4e9ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_57f295f2-5091-48a2-a214-3f8b4c4e9ce4" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_d8ab3827-ac66-4354-9d90-4cf0223c318f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_d8ab3827-ac66-4354-9d90-4cf0223c318f" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_95a0c742-ca7e-4de4-bb01-27c4bced4711" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_95a0c742-ca7e-4de4-bb01-27c4bced4711" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_7cbeed02-cd18-4575-b649-b50246c631bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_7cbeed02-cd18-4575-b649-b50246c631bd" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_4ae48da8-41b7-4353-884f-bf6257bc1a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_587d1041-0ee5-48c5-afe0-8663133f1bad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_4ae48da8-41b7-4353-884f-bf6257bc1a0c" xlink:type="arc" order="9"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnNonVestedRestrictedStockOutstandingDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnNonVestedRestrictedStockOutstandingDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryOfAdditionalInformationOnNonVestedRestrictedStockOutstandingDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50e07550-e45b-4cc5-b8c4-aecd92d419da" 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_c7bd9286-fd9c-4870-9cea-04a8e352a068" 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_50e07550-e45b-4cc5-b8c4-aecd92d419da" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7bd9286-fd9c-4870-9cea-04a8e352a068" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd" 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_c7bd9286-fd9c-4870-9cea-04a8e352a068" xlink:to="loc_us-gaap_AwardTypeAxis_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd_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_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_914ccaed-b6d2-4518-badb-7be572d60eac" 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_a2fd9803-cea9-44f9-8a14-9a742cdfbbdd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_914ccaed-b6d2-4518-badb-7be572d60eac" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_9224df7d-2808-43ba-ad88-c4a20ff52580" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_914ccaed-b6d2-4518-badb-7be572d60eac" xlink:to="loc_us-gaap_RestrictedStockMember_9224df7d-2808-43ba-ad88-c4a20ff52580" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember_4527c95d-3ebd-4293-bc83-550f42904be1" xlink:href="tg-20231231.xsd#tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_914ccaed-b6d2-4518-badb-7be572d60eac" xlink:to="loc_tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember_4527c95d-3ebd-4293-bc83-550f42904be1" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" 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_50e07550-e45b-4cc5-b8c4-aecd92d419da" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3cbb1552-aca5-4c68-81b0-c1448b462b78" 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_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3cbb1552-aca5-4c68-81b0-c1448b462b78" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3d540c62-7f87-42ef-b827-805dbf8b3a8c" 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_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3d540c62-7f87-42ef-b827-805dbf8b3a8c" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c6c9931c-caad-43e9-9ff4-92de4da56b56" 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_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c6c9931c-caad-43e9-9ff4-92de4da56b56" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8c5c2b7d-ddff-4ce8-a943-3ac77292c45a" 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_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8c5c2b7d-ddff-4ce8-a943-3ac77292c45a" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_9eaa4a0c-ccbb-416b-bed2-acdea5c76121" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_119c103a-72ce-427e-a71e-5e6c92591470" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_119c103a-72ce-427e-a71e-5e6c92591470" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a5af5f41-3125-4616-a4b2-e7fec1277693" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_a5af5f41-3125-4616-a4b2-e7fec1277693" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_cea53339-e264-4665-ae59-a1004ec40525" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_cea53339-e264-4665-ae59-a1004ec40525" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_466c996f-1823-43a6-86e0-d3f9d98bf8e0" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_3a65b8fa-a421-47ff-8ca3-626ed214b582" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_466c996f-1823-43a6-86e0-d3f9d98bf8e0" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_458937a2-af8b-4d8a-b1f8-455e8c84d9d7" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" 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_50e07550-e45b-4cc5-b8c4-aecd92d419da" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue_f5dd56b1-4011-44a7-8edb-639c87670a11" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue_f5dd56b1-4011-44a7-8edb-639c87670a11" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue_f26489c3-c7e6-4e2e-8ce1-03686980415f" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue_f26489c3-c7e6-4e2e-8ce1-03686980415f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_e430f116-4a52-41a7-9f88-6bdf16f64790" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_e430f116-4a52-41a7-9f88-6bdf16f64790" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue_05dad053-755a-42f1-b27c-d3fcdae40187" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_acbee247-2118-4867-a038-4272e8a5f25a" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue_05dad053-755a-42f1-b27c-d3fcdae40187" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue_2c5f18c0-166f-462e-bc81-26e637e6e19f" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryofSARsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#StockOptionAndStockAwardPlansSummaryofSARsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/StockOptionAndStockAwardPlansSummaryofSARsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_1abbc23a-41f5-4958-b573-2d79cea48dae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_1abbc23a-41f5-4958-b573-2d79cea48dae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_19542e39-93ee-4bfc-b280-5e649d07a816" 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_ScheduleOfDeferredCompensationArrangementWithIndividualShareBasedPaymentsTable_1abbc23a-41f5-4958-b573-2d79cea48dae" xlink:to="loc_srt_RangeAxis_19542e39-93ee-4bfc-b280-5e649d07a816" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_19542e39-93ee-4bfc-b280-5e649d07a816_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_19542e39-93ee-4bfc-b280-5e649d07a816" xlink:to="loc_srt_RangeMember_19542e39-93ee-4bfc-b280-5e649d07a816_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b3f63b51-f363-4d71-9fa8-d2b812359921" 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_19542e39-93ee-4bfc-b280-5e649d07a816" xlink:to="loc_srt_RangeMember_b3f63b51-f363-4d71-9fa8-d2b812359921" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_96e91298-0e4b-463b-828d-c932a757f308" 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_b3f63b51-f363-4d71-9fa8-d2b812359921" xlink:to="loc_srt_MinimumMember_96e91298-0e4b-463b-828d-c932a757f308" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4c007b8b-d96f-47a6-bc1f-8168562f88ad" 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_b3f63b51-f363-4d71-9fa8-d2b812359921" xlink:to="loc_srt_MaximumMember_4c007b8b-d96f-47a6-bc1f-8168562f88ad" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_e843e5e7-15b2-432a-92f7-d7b34a0fba2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_e843e5e7-15b2-432a-92f7-d7b34a0fba2c" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingExercisePrice_a821514e-5177-4c9c-aded-3c1202686f33" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingExercisePrice_a821514e-5177-4c9c-aded-3c1202686f33" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingWeightedAverageExercisePrice_a0d92f9d-d0ba-40e9-b8b9-62ea373edcc8" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityAwardsOutstandingWeightedAverageExercisePrice_a0d92f9d-d0ba-40e9-b8b9-62ea373edcc8" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_6c7dfa11-e042-4d13-a970-579f587f0fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_6c7dfa11-e042-4d13-a970-579f587f0fa5" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardGrantsInPeriodExercisePrice_e0fb5203-17e4-4b83-b6d2-1ab79b5d20aa" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardGrantsInPeriodExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardGrantsInPeriodExercisePrice_e0fb5203-17e4-4b83-b6d2-1ab79b5d20aa" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsGrantsInPeriodWeightedAverageExercisePrice_429ecdce-aa82-4228-86b0-2db7fb1e310f" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsGrantsInPeriodWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsGrantsInPeriodWeightedAverageExercisePrice_429ecdce-aa82-4228-86b0-2db7fb1e310f" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModification_969c1de4-f851-47ce-9115-a154d1043dfa" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModification"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModification_969c1de4-f851-47ce-9115-a154d1043dfa" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardModificationExercisePrice_d465ce1e-05f8-4884-ac2d-651916893cd0" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardModificationExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardModificationExercisePrice_d465ce1e-05f8-4884-ac2d-651916893cd0" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsModificationWeightedAverageExercisePrice_808bac72-d94f-4140-8b95-807a1e2537f6" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsModificationWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsModificationWeightedAverageExercisePrice_808bac72-d94f-4140-8b95-807a1e2537f6" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_eca87b3c-44fb-4389-aa0e-76c7bd9a9a40" 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_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_eca87b3c-44fb-4389-aa0e-76c7bd9a9a40" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardForfeitedAndExpiredExercisePrice_c1391fe8-4007-426a-87d9-35db73b3843a" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardForfeitedAndExpiredExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardForfeitedAndExpiredExercisePrice_c1391fe8-4007-426a-87d9-35db73b3843a" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsForfeitedAndExpiredWeightedAverageExercisePrice_29249428-40b3-4a2d-a27a-a353dccfdde6" xlink:href="tg-20231231.xsd#tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsForfeitedAndExpiredWeightedAverageExercisePrice"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems_699f08c6-3b29-4f7e-9b0d-3ffd07e0965b" xlink:to="loc_tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityAwardsForfeitedAndExpiredWeightedAverageExercisePrice_29249428-40b3-4a2d-a27a-a353dccfdde6" xlink:type="arc" order="11"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#IncomeTaxesNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:href="tg-20231231.xsd#tg_IncomeTaxesLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:href="tg-20231231.xsd#tg_IncomeTaxesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_65e356dd-1ba1-451a-a112-8c3a25050e2d" 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_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_65e356dd-1ba1-451a-a112-8c3a25050e2d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_65e356dd-1ba1-451a-a112-8c3a25050e2d_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_65e356dd-1ba1-451a-a112-8c3a25050e2d" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_65e356dd-1ba1-451a-a112-8c3a25050e2d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_fc2df566-acef-4f37-ac76-8b1907b2978e" 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_65e356dd-1ba1-451a-a112-8c3a25050e2d" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_fc2df566-acef-4f37-ac76-8b1907b2978e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_BrazilianMember_fc1bb151-2f4c-4ba6-83aa-d427a2327173" xlink:href="tg-20231231.xsd#tg_BrazilianMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_fc2df566-acef-4f37-ac76-8b1907b2978e" xlink:to="loc_tg_BrazilianMember_fc1bb151-2f4c-4ba6-83aa-d427a2327173" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_IncomeTaxBeneficiaryAxis_71dc7e3a-7a18-4b50-baf4-7463345c6c84" xlink:href="tg-20231231.xsd#tg_IncomeTaxBeneficiaryAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:to="loc_tg_IncomeTaxBeneficiaryAxis_71dc7e3a-7a18-4b50-baf4-7463345c6c84" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_IncomeTaxBeneficiaryDomain_71dc7e3a-7a18-4b50-baf4-7463345c6c84_default" xlink:href="tg-20231231.xsd#tg_IncomeTaxBeneficiaryDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_tg_IncomeTaxBeneficiaryAxis_71dc7e3a-7a18-4b50-baf4-7463345c6c84" xlink:to="loc_tg_IncomeTaxBeneficiaryDomain_71dc7e3a-7a18-4b50-baf4-7463345c6c84_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_IncomeTaxBeneficiaryDomain_56592e0d-154a-4535-b857-4834b2033858" xlink:href="tg-20231231.xsd#tg_IncomeTaxBeneficiaryDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_tg_IncomeTaxBeneficiaryAxis_71dc7e3a-7a18-4b50-baf4-7463345c6c84" xlink:to="loc_tg_IncomeTaxBeneficiaryDomain_56592e0d-154a-4535-b857-4834b2033858" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TerphaneLtdaMember_61fe7d2a-4065-4e65-b8d6-8f79d70ae9d7" xlink:href="tg-20231231.xsd#tg_TerphaneLtdaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxBeneficiaryDomain_56592e0d-154a-4535-b857-4834b2033858" xlink:to="loc_tg_TerphaneLtdaMember_61fe7d2a-4065-4e65-b8d6-8f79d70ae9d7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_33927725-09c0-407c-a8e8-cdacc77738ec" 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_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:to="loc_srt_RangeAxis_33927725-09c0-407c-a8e8-cdacc77738ec" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_33927725-09c0-407c-a8e8-cdacc77738ec_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_33927725-09c0-407c-a8e8-cdacc77738ec" xlink:to="loc_srt_RangeMember_33927725-09c0-407c-a8e8-cdacc77738ec_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_27ca1a39-12b5-4b4b-8c24-4715b1558f54" 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_33927725-09c0-407c-a8e8-cdacc77738ec" xlink:to="loc_srt_RangeMember_27ca1a39-12b5-4b4b-8c24-4715b1558f54" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1d4bab91-f730-405b-bcb6-1c56c53eb5fd" 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_27ca1a39-12b5-4b4b-8c24-4715b1558f54" xlink:to="loc_srt_MaximumMember_1d4bab91-f730-405b-bcb6-1c56c53eb5fd" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_df3f022c-b4af-4ab2-aa25-b3c157e5592d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_IncomeTaxesTable_440334d3-9a05-4465-b93b-44639f84bdad" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_df3f022c-b4af-4ab2-aa25-b3c157e5592d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_df3f022c-b4af-4ab2-aa25-b3c157e5592d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_df3f022c-b4af-4ab2-aa25-b3c157e5592d" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_df3f022c-b4af-4ab2-aa25-b3c157e5592d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_3c4eea80-a7dd-4078-8ab7-688d84e2491a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_df3f022c-b4af-4ab2-aa25-b3c157e5592d" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_3c4eea80-a7dd-4078-8ab7-688d84e2491a" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_StateAndForeignNetOperatingLossCarryforwardsMember_486d39ba-1369-4ed7-9748-f995fe704403" xlink:href="tg-20231231.xsd#tg_StateAndForeignNetOperatingLossCarryforwardsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_3c4eea80-a7dd-4078-8ab7-688d84e2491a" xlink:to="loc_tg_StateAndForeignNetOperatingLossCarryforwardsMember_486d39ba-1369-4ed7-9748-f995fe704403" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember_dd3f810c-85ec-4100-9bda-64b8876f8639" xlink:href="tg-20231231.xsd#tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_3c4eea80-a7dd-4078-8ab7-688d84e2491a" xlink:to="loc_tg_ExcessCapitalLossesFromInvestmentsAndOtherRelatedItemsMember_dd3f810c-85ec-4100-9bda-64b8876f8639" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_dd126493-36da-4fd4-a97f-782cc095b4c2" 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_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_dd126493-36da-4fd4-a97f-782cc095b4c2" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductions_5b98cd10-e53a-4e49-80aa-40bff05f9c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDeductions"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductions_5b98cd10-e53a-4e49-80aa-40bff05f9c4e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome_2b7b981f-32a8-4ede-a328-1beae0ac05e1" xlink:href="tg-20231231.xsd#tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateIncludingSocialContributionOnIncome_2b7b981f-32a8-4ede-a328-1beae0ac05e1" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome_1b08376b-117c-44da-951b-a54202ffd5bd" xlink:href="tg-20231231.xsd#tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_EffectiveIncomeTaxRateReconciliationFederalStatutoryTaxRateExcludingSocialContributionOnIncome_1b08376b-117c-44da-951b-a54202ffd5bd" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome_7e816ce1-f21e-48ea-a1fc-78a2c31c6c69" xlink:href="tg-20231231.xsd#tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_EffectiveIncomeTaxRateReconciliationSocialContributionOnIncome_7e816ce1-f21e-48ea-a1fc-78a2c31c6c69" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome_d5c7b35a-8e83-429b-a25a-edef905cfe61" xlink:href="tg-20231231.xsd#tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_CurrentEffectiveTaxRateIncludingSocialContributionOnIncome_d5c7b35a-8e83-429b-a25a-edef905cfe61" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome_1260673b-b4aa-4d19-9ec2-a9782c26b6f2" xlink:href="tg-20231231.xsd#tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_CurrentEffectiveTaxRateReconciliationSocialContributionOnIncome_1260673b-b4aa-4d19-9ec2-a9782c26b6f2" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ForeignTaxCreditBrazil_546abc52-17b1-4daa-8d61-2f73db62036a" xlink:href="tg-20231231.xsd#tg_ForeignTaxCreditBrazil"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_ForeignTaxCreditBrazil_546abc52-17b1-4daa-8d61-2f73db62036a" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_031b8576-a533-4a2a-b2a7-9fb551b443c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_031b8576-a533-4a2a-b2a7-9fb551b443c0" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_24a689df-9300-43f0-96e8-00e42600fe34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_24a689df-9300-43f0-96e8-00e42600fe34" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetInterestCarryforward_68205810-0bb8-413c-b30d-617e004033ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetInterestCarryforward"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_DeferredTaxAssetInterestCarryforward_68205810-0bb8-413c-b30d-617e004033ea" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NetOperatingLossCarrforwardExpirationPeriod_d04cc987-86b9-44eb-9f59-6282ee7c7b5b" xlink:href="tg-20231231.xsd#tg_NetOperatingLossCarrforwardExpirationPeriod"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_tg_NetOperatingLossCarrforwardExpirationPeriod_d04cc987-86b9-44eb-9f59-6282ee7c7b5b" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_d371a797-73fb-4f2f-87dc-922ef2ba0ff9" 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_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_d371a797-73fb-4f2f-87dc-922ef2ba0ff9" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsStateTaxes_afa12c8e-1b76-477c-a883-d208ce3ea50a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsStateTaxes"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_IncomeTaxesLineItems_d6754857-1316-4b72-9cb5-9fea28d7f156" xlink:to="loc_us-gaap_DeferredTaxAssetsStateTaxes_afa12c8e-1b76-477c-a883-d208ce3ea50a" xlink:type="arc" order="13"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_a4616063-0ca8-41bb-abb7-a94e6c14709d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_f2b59a89-6fc0-4048-8fc7-5281e5497f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_a4616063-0ca8-41bb-abb7-a94e6c14709d" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_f2b59a89-6fc0-4048-8fc7-5281e5497f8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_60f22fc5-ff5c-4255-b339-8cde7f9f1e22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_f2b59a89-6fc0-4048-8fc7-5281e5497f8a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_60f22fc5-ff5c-4255-b339-8cde7f9f1e22" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_60f22fc5-ff5c-4255-b339-8cde7f9f1e22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_60f22fc5-ff5c-4255-b339-8cde7f9f1e22" xlink:to="loc_us-gaap_SegmentDomain_60f22fc5-ff5c-4255-b339-8cde7f9f1e22_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a038138d-8824-46b8-acbc-6e055ea6f19b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_60f22fc5-ff5c-4255-b339-8cde7f9f1e22" xlink:to="loc_us-gaap_SegmentDomain_a038138d-8824-46b8-acbc-6e055ea6f19b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ExportsFromUnitedStatesMember_2f64dcb7-0160-42d7-92aa-5a1ee3b3d171" xlink:href="tg-20231231.xsd#tg_ExportsFromUnitedStatesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a038138d-8824-46b8-acbc-6e055ea6f19b" xlink:to="loc_tg_ExportsFromUnitedStatesMember_2f64dcb7-0160-42d7-92aa-5a1ee3b3d171" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_899ec1d0-1ed2-41c6-990c-6807d29d7f77" 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_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_f2b59a89-6fc0-4048-8fc7-5281e5497f8a" xlink:to="loc_srt_StatementGeographicalAxis_899ec1d0-1ed2-41c6-990c-6807d29d7f77" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_899ec1d0-1ed2-41c6-990c-6807d29d7f77_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_899ec1d0-1ed2-41c6-990c-6807d29d7f77" xlink:to="loc_srt_SegmentGeographicalDomain_899ec1d0-1ed2-41c6-990c-6807d29d7f77_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_27e3e2a8-8768-4782-a73a-8ef3f7a1f76b" 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_899ec1d0-1ed2-41c6-990c-6807d29d7f77" xlink:to="loc_srt_SegmentGeographicalDomain_27e3e2a8-8768-4782-a73a-8ef3f7a1f76b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_5f641a1b-112a-4e50-ba1a-0d688782b18f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_27e3e2a8-8768-4782-a73a-8ef3f7a1f76b" xlink:to="loc_srt_AsiaMember_5f641a1b-112a-4e50-ba1a-0d688782b18f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_04ff404d-5ee0-4845-abac-f45fbd52ea48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_a4616063-0ca8-41bb-abb7-a94e6c14709d" xlink:to="loc_us-gaap_Revenues_04ff404d-5ee0-4845-abac-f45fbd52ea48" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfSegmentReportingInformationBySegmentDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfSegmentReportingInformationBySegmentDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfSegmentReportingInformationBySegmentDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_1b94c174-9ee3-420b-9ecb-c0bcbe49e9c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_1b94c174-9ee3-420b-9ecb-c0bcbe49e9c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_5a1bdf0d-6c7d-4293-a0d7-64c566220a70" 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_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_1b94c174-9ee3-420b-9ecb-c0bcbe49e9c8" xlink:to="loc_srt_ProductOrServiceAxis_5a1bdf0d-6c7d-4293-a0d7-64c566220a70" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5a1bdf0d-6c7d-4293-a0d7-64c566220a70_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_5a1bdf0d-6c7d-4293-a0d7-64c566220a70" xlink:to="loc_srt_ProductsAndServicesDomain_5a1bdf0d-6c7d-4293-a0d7-64c566220a70_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a9dc1baf-4e71-430e-b06f-caf8bdf0f3c6" 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_5a1bdf0d-6c7d-4293-a0d7-64c566220a70" xlink:to="loc_srt_ProductsAndServicesDomain_a9dc1baf-4e71-430e-b06f-caf8bdf0f3c6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShippingAndHandlingMember_457c8c1c-20c5-42cf-9df9-ff150b5bb4d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShippingAndHandlingMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a9dc1baf-4e71-430e-b06f-caf8bdf0f3c6" xlink:to="loc_us-gaap_ShippingAndHandlingMember_457c8c1c-20c5-42cf-9df9-ff150b5bb4d5" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ced19ec3-a907-4c2c-a813-3d01a2bdf14a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_1b94c174-9ee3-420b-9ecb-c0bcbe49e9c8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ced19ec3-a907-4c2c-a813-3d01a2bdf14a" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ced19ec3-a907-4c2c-a813-3d01a2bdf14a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ced19ec3-a907-4c2c-a813-3d01a2bdf14a" xlink:to="loc_us-gaap_SegmentDomain_ced19ec3-a907-4c2c-a813-3d01a2bdf14a_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ced19ec3-a907-4c2c-a813-3d01a2bdf14a" xlink:to="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PEFilmsMember_8acaa3b0-eee1-4daf-8c96-8e3d4d33434f" xlink:href="tg-20231231.xsd#tg_PEFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:to="loc_tg_PEFilmsMember_8acaa3b0-eee1-4daf-8c96-8e3d4d33434f" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_ad8d42ab-7fc6-446d-98cb-0d950a1360bd" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:to="loc_tg_AluminumExtrusionsMember_ad8d42ab-7fc6-446d-98cb-0d950a1360bd" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_50bd69d0-b3cb-47f3-b509-1035085e0a09" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:to="loc_tg_FlexiblePackagingFilmsMember_50bd69d0-b3cb-47f3-b509-1035085e0a09" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PETFilmsMember_54ff31ed-e332-44a4-a5a7-abeee6da31af" xlink:href="tg-20231231.xsd#tg_PETFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bbf792b-6714-41a1-b8d7-a1d30f3aabaf" xlink:to="loc_tg_PETFilmsMember_54ff31ed-e332-44a4-a5a7-abeee6da31af" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e6065b1e-5e57-4b43-b367-7839fd701b73" 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_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_1b94c174-9ee3-420b-9ecb-c0bcbe49e9c8" xlink:to="loc_dei_LegalEntityAxis_e6065b1e-5e57-4b43-b367-7839fd701b73" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e6065b1e-5e57-4b43-b367-7839fd701b73_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_e6065b1e-5e57-4b43-b367-7839fd701b73" xlink:to="loc_dei_EntityDomain_e6065b1e-5e57-4b43-b367-7839fd701b73_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b4c6dff2-ea5c-47ac-9458-cc1136ca0d9e" 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_e6065b1e-5e57-4b43-b367-7839fd701b73" xlink:to="loc_dei_EntityDomain_b4c6dff2-ea5c-47ac-9458-cc1136ca0d9e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_KaleoMember_9d8299b4-308f-4e99-a00c-8de712257c3e" xlink:href="tg-20231231.xsd#tg_KaleoMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_b4c6dff2-ea5c-47ac-9458-cc1136ca0d9e" xlink:to="loc_tg_KaleoMember_9d8299b4-308f-4e99-a00c-8de712257c3e" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NetSales_6f604456-40e4-42a6-a9c6-00573bb1abdc" xlink:href="tg-20231231.xsd#tg_NetSales"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_NetSales_6f604456-40e4-42a6-a9c6-00573bb1abdc" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_6de97636-9370-4757-b684-85c892ba1316" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_6de97636-9370-4757-b684-85c892ba1316" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GrossSales_0ff3cdeb-8ebd-4090-a9e8-bef9c28aef92" xlink:href="tg-20231231.xsd#tg_GrossSales"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_GrossSales_0ff3cdeb-8ebd-4090-a9e8-bef9c28aef92" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EarningsBeforeInterestTaxesDepreciationAndAmortizationEBITDA_0248aba6-8ae7-45be-9f82-16b44970bbda" xlink:href="tg-20231231.xsd#tg_EarningsBeforeInterestTaxesDepreciationAndAmortizationEBITDA"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_EarningsBeforeInterestTaxesDepreciationAndAmortizationEBITDA_0248aba6-8ae7-45be-9f82-16b44970bbda" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_6bd7f1bb-c1d4-46ad-90fb-18cd23b78953" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_6bd7f1bb-c1d4-46ad-90fb-18cd23b78953" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_EarningsBeforeInterestAndTaxesEBIT_d092abac-0e68-4128-83f3-a745791f6a84" xlink:href="tg-20231231.xsd#tg_EarningsBeforeInterestAndTaxesEBIT"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_EarningsBeforeInterestAndTaxesEBIT_d092abac-0e68-4128-83f3-a745791f6a84" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PlantShutdownsAssetImpairmentsRestructuringAndOther_618992ec-291f-49f2-8639-b44c38ecee22" xlink:href="tg-20231231.xsd#tg_PlantShutdownsAssetImpairmentsRestructuringAndOther"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_PlantShutdownsAssetImpairmentsRestructuringAndOther_618992ec-291f-49f2-8639-b44c38ecee22" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_TotalIncomeLossAssociatedWithSegments_4665fca0-7093-4400-8ad4-a92d1ab42663" xlink:href="tg-20231231.xsd#tg_TotalIncomeLossAssociatedWithSegments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_TotalIncomeLossAssociatedWithSegments_4665fca0-7093-4400-8ad4-a92d1ab42663" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_6ca45438-fc0b-4e1d-989d-aeed3771212c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeInterest"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_InvestmentIncomeInterest_6ca45438-fc0b-4e1d-989d-aeed3771212c" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpense_b2d81e95-2e37-47f8-a495-a078f7fdb9a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestAndDebtExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_InterestAndDebtExpense_b2d81e95-2e37-47f8-a495-a078f7fdb9a9" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_5858a1e7-f229-4096-b5dc-b542fb7174ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_5858a1e7-f229-4096-b5dc-b542fb7174ff" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionPlanExpense_67a98ebd-6b94-49ec-87d4-974bf05460a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockOptionPlanExpense"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_StockOptionPlanExpense_67a98ebd-6b94-49ec-87d4-974bf05460a0" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PreTaxActuarialLossForPensionSettlement_4018c507-e14c-4f1a-a8c7-291b95507e3f" xlink:href="tg-20231231.xsd#tg_PreTaxActuarialLossForPensionSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_PreTaxActuarialLossForPensionSettlement_4018c507-e14c-4f1a-a8c7-291b95507e3f" xlink:type="arc" order="12"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CorporateExpensesNet_6c979fac-cea4-4205-9df1-78b650528cc4" xlink:href="tg-20231231.xsd#tg_CorporateExpensesNet"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_tg_CorporateExpensesNet_6c979fac-cea4-4205-9df1-78b650528cc4" xlink:type="arc" order="13"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b7bb3903-e986-4276-99ca-5e9639204a61" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b7bb3903-e986-4276-99ca-5e9639204a61" xlink:type="arc" order="14"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_ead657ad-4dc9-49b3-b3c8-9ea3e3d79b5c" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_ead657ad-4dc9-49b3-b3c8-9ea3e3d79b5c" xlink:type="arc" order="15"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_bd85042c-a517-4933-83ae-010c468a859e" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_01fb8318-9e82-46bb-9d3f-c4806947dfc1" xlink:to="loc_us-gaap_NetIncomeLoss_bd85042c-a517-4933-83ae-010c468a859e" xlink:type="arc" order="16"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfIdentifiableAssetsDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfIdentifiableAssetsDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfIdentifiableAssetsDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_94b12b8a-9874-41e8-8269-cab5f7ec0297" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_721e16e9-d634-4a25-8b30-0055bccba762" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_94b12b8a-9874-41e8-8269-cab5f7ec0297" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_721e16e9-d634-4a25-8b30-0055bccba762" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ce8f24bd-1088-4969-a879-2e3c23b60633" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_721e16e9-d634-4a25-8b30-0055bccba762" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ce8f24bd-1088-4969-a879-2e3c23b60633" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ce8f24bd-1088-4969-a879-2e3c23b60633_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ce8f24bd-1088-4969-a879-2e3c23b60633" xlink:to="loc_us-gaap_SegmentDomain_ce8f24bd-1088-4969-a879-2e3c23b60633_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ce8f24bd-1088-4969-a879-2e3c23b60633" xlink:to="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PEFilmsMember_538f8e85-132e-424b-bddb-df54cd8be7be" xlink:href="tg-20231231.xsd#tg_PEFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:to="loc_tg_PEFilmsMember_538f8e85-132e-424b-bddb-df54cd8be7be" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GeneralCorporateMember_012616b2-a80e-4f57-800b-a0b52595cb03" xlink:href="tg-20231231.xsd#tg_GeneralCorporateMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:to="loc_tg_GeneralCorporateMember_012616b2-a80e-4f57-800b-a0b52595cb03" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SubtotalMember_322a2efc-c8aa-4edb-ab30-3d946d787c71" xlink:href="tg-20231231.xsd#tg_SubtotalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:to="loc_tg_SubtotalMember_322a2efc-c8aa-4edb-ab30-3d946d787c71" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_78c49360-1bcc-4e83-9886-dcf7138de2d4" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:to="loc_tg_AluminumExtrusionsMember_78c49360-1bcc-4e83-9886-dcf7138de2d4" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_f5d9f301-31d9-4a82-bf58-202885e4d33d" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_51606237-54f8-4425-8c67-b5d77ca0c431" xlink:to="loc_tg_FlexiblePackagingFilmsMember_f5d9f301-31d9-4a82-bf58-202885e4d33d" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_122bf599-d4fe-43c9-b0a0-050790bc4a15" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_721e16e9-d634-4a25-8b30-0055bccba762" xlink:to="loc_srt_ConsolidationItemsAxis_122bf599-d4fe-43c9-b0a0-050790bc4a15" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_122bf599-d4fe-43c9-b0a0-050790bc4a15_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_122bf599-d4fe-43c9-b0a0-050790bc4a15" xlink:to="loc_srt_ConsolidationItemsDomain_122bf599-d4fe-43c9-b0a0-050790bc4a15_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3fc911a0-1197-48e4-902a-bdd112b4c853" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_122bf599-d4fe-43c9-b0a0-050790bc4a15" xlink:to="loc_srt_ConsolidationItemsDomain_3fc911a0-1197-48e4-902a-bdd112b4c853" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_a8d5bf59-bedf-413b-9827-016df5634efa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3fc911a0-1197-48e4-902a-bdd112b4c853" xlink:to="loc_us-gaap_OperatingSegmentsMember_a8d5bf59-bedf-413b-9827-016df5634efa" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_4ce5f78d-80eb-4dec-8ba4-d44cfe7feb80" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_94b12b8a-9874-41e8-8269-cab5f7ec0297" xlink:to="loc_us-gaap_Assets_4ce5f78d-80eb-4dec-8ba4-d44cfe7feb80" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6d3af215-d952-4001-9443-af0469f9e650" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_94b12b8a-9874-41e8-8269-cab5f7ec0297" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6d3af215-d952-4001-9443-af0469f9e650" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfDepreciationAndAmortizationCapitalExpendituresDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfDepreciationAndAmortizationCapitalExpendituresDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfDepreciationAndAmortizationCapitalExpendituresDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_325fe689-a883-457e-9039-b63766443228" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d1eeba8a-b46b-49ab-96f7-2e51d6e2fb98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_325fe689-a883-457e-9039-b63766443228" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d1eeba8a-b46b-49ab-96f7-2e51d6e2fb98" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_e508a5df-155c-4e66-a801-818ceed857c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d1eeba8a-b46b-49ab-96f7-2e51d6e2fb98" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_e508a5df-155c-4e66-a801-818ceed857c4" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e508a5df-155c-4e66-a801-818ceed857c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e508a5df-155c-4e66-a801-818ceed857c4" xlink:to="loc_us-gaap_SegmentDomain_e508a5df-155c-4e66-a801-818ceed857c4_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e508a5df-155c-4e66-a801-818ceed857c4" xlink:to="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PEFilmsMember_6eab19ee-aed6-4b16-9dfd-2d7afaa8a6a8" xlink:href="tg-20231231.xsd#tg_PEFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:to="loc_tg_PEFilmsMember_6eab19ee-aed6-4b16-9dfd-2d7afaa8a6a8" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_aa6048f7-4b88-4c9f-9da3-863aa026dae7" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:to="loc_tg_AluminumExtrusionsMember_aa6048f7-4b88-4c9f-9da3-863aa026dae7" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SubtotalMember_45fa8784-420a-44c1-8753-7838320e6734" xlink:href="tg-20231231.xsd#tg_SubtotalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:to="loc_tg_SubtotalMember_45fa8784-420a-44c1-8753-7838320e6734" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GeneralCorporateMember_54f32a95-b8ef-4ae4-897d-88a761920e78" xlink:href="tg-20231231.xsd#tg_GeneralCorporateMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:to="loc_tg_GeneralCorporateMember_54f32a95-b8ef-4ae4-897d-88a761920e78" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_290d5088-f1e5-470f-bda3-40fee91d2b64" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d7e0def2-956c-43eb-b016-0fd0b4eae131" xlink:to="loc_tg_FlexiblePackagingFilmsMember_290d5088-f1e5-470f-bda3-40fee91d2b64" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_c96db6e1-ce66-49a0-9a80-54dc7a249521" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d1eeba8a-b46b-49ab-96f7-2e51d6e2fb98" xlink:to="loc_srt_ConsolidationItemsAxis_c96db6e1-ce66-49a0-9a80-54dc7a249521" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_c96db6e1-ce66-49a0-9a80-54dc7a249521_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_c96db6e1-ce66-49a0-9a80-54dc7a249521" xlink:to="loc_srt_ConsolidationItemsDomain_c96db6e1-ce66-49a0-9a80-54dc7a249521_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_0f6dcfd8-2d0e-4eb8-8b58-f7515a2e017b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_c96db6e1-ce66-49a0-9a80-54dc7a249521" xlink:to="loc_srt_ConsolidationItemsDomain_0f6dcfd8-2d0e-4eb8-8b58-f7515a2e017b" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_57f0ad49-d976-4260-adea-4580dba080ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0f6dcfd8-2d0e-4eb8-8b58-f7515a2e017b" xlink:to="loc_us-gaap_OperatingSegmentsMember_57f0ad49-d976-4260-adea-4580dba080ab" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDepreciationAndAmortization_cb2112ef-801b-47fb-9e64-7a0d870c53f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherDepreciationAndAmortization"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_325fe689-a883-457e-9039-b63766443228" xlink:to="loc_us-gaap_OtherDepreciationAndAmortization_cb2112ef-801b-47fb-9e64-7a0d870c53f0" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_081ff8b8-a3a0-4412-806f-52ce9c9b455f" 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_SegmentReportingInformationLineItems_325fe689-a883-457e-9039-b63766443228" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_081ff8b8-a3a0-4412-806f-52ce9c9b455f" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfNetSalesByGeographicAreaDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfNetSalesByGeographicAreaDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfNetSalesByGeographicAreaDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_ba85cdcf-b471-4035-ae6d-8358c4c7d931" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_6d9d1acf-e1c9-46cb-8508-8174ec3dc440" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ba85cdcf-b471-4035-ae6d-8358c4c7d931" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_6d9d1acf-e1c9-46cb-8508-8174ec3dc440" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1054bc3b-4612-42ca-83c4-1a4c7c57b030" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_6d9d1acf-e1c9-46cb-8508-8174ec3dc440" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1054bc3b-4612-42ca-83c4-1a4c7c57b030" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1054bc3b-4612-42ca-83c4-1a4c7c57b030_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1054bc3b-4612-42ca-83c4-1a4c7c57b030" xlink:to="loc_us-gaap_SegmentDomain_1054bc3b-4612-42ca-83c4-1a4c7c57b030_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c9912eea-b955-45b1-aeeb-5b514817196d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1054bc3b-4612-42ca-83c4-1a4c7c57b030" xlink:to="loc_us-gaap_SegmentDomain_c9912eea-b955-45b1-aeeb-5b514817196d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ExportsFromUnitedStatesMember_4f994987-4c10-43d4-88da-e3ab8679cc6a" xlink:href="tg-20231231.xsd#tg_ExportsFromUnitedStatesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c9912eea-b955-45b1-aeeb-5b514817196d" xlink:to="loc_tg_ExportsFromUnitedStatesMember_4f994987-4c10-43d4-88da-e3ab8679cc6a" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OperationsOutsideUnitedStatesMember_4afa29ee-c65e-4b46-9541-f17de96b911e" xlink:href="tg-20231231.xsd#tg_OperationsOutsideUnitedStatesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c9912eea-b955-45b1-aeeb-5b514817196d" xlink:to="loc_tg_OperationsOutsideUnitedStatesMember_4afa29ee-c65e-4b46-9541-f17de96b911e" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07" 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_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_6d9d1acf-e1c9-46cb-8508-8174ec3dc440" xlink:to="loc_srt_StatementGeographicalAxis_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07_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_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07" xlink:to="loc_srt_SegmentGeographicalDomain_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" 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_97a59c01-d873-4c1e-b0f5-8abf7ba1cc07" xlink:to="loc_srt_SegmentGeographicalDomain_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_country_US_b6b92238-0621-421a-b973-b895d2dd954b" 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_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_country_US_b6b92238-0621-421a-b973-b895d2dd954b" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_09f88f2f-730b-492b-8501-2e127e040699" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_srt_AsiaMember_09f88f2f-730b-492b-8501-2e127e040699" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_country_CA_4584d9b0-273d-4890-9398-d4b17865b3cd" 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_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_country_CA_4584d9b0-273d-4890-9398-d4b17865b3cd" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_32db9d99-6340-4810-9be4-a1a9c3facda6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EuropeMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_srt_EuropeMember_32db9d99-6340-4810-9be4-a1a9c3facda6" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_LatinAmericaMember_53f64fbc-5cce-4c70-b466-3c924f1fe8a0" 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_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_srt_LatinAmericaMember_53f64fbc-5cce-4c70-b466-3c924f1fe8a0" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_country_BR_97b1d970-51b0-41c8-ab94-1b8a8b56fce6" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_BR"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5ec02d87-5e4c-4daa-8863-19b73f0d9db8" xlink:to="loc_country_BR_97b1d970-51b0-41c8-ab94-1b8a8b56fce6" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NetSales_4bd8014c-5dc6-4fe0-8865-94eec1e4fea6" xlink:href="tg-20231231.xsd#tg_NetSales"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_ba85cdcf-b471-4035-ae6d-8358c4c7d931" xlink:to="loc_tg_NetSales_4bd8014c-5dc6-4fe0-8865-94eec1e4fea6" xlink:type="arc" order="0"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfIdentifiableAssetsByGeographicAreaPropertyPlantEquipmentNetByGeographicAreaDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfIdentifiableAssetsByGeographicAreaPropertyPlantEquipmentNetByGeographicAreaDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfIdentifiableAssetsByGeographicAreaPropertyPlantEquipmentNetByGeographicAreaDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e847d70f-8c9c-4147-a7b9-60ff70d97ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e847d70f-8c9c-4147-a7b9-60ff70d97ef0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_43ee496a-cdec-4391-8d0d-0d7c090495f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e847d70f-8c9c-4147-a7b9-60ff70d97ef0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_43ee496a-cdec-4391-8d0d-0d7c090495f8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_43ee496a-cdec-4391-8d0d-0d7c090495f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_43ee496a-cdec-4391-8d0d-0d7c090495f8" xlink:to="loc_us-gaap_SegmentDomain_43ee496a-cdec-4391-8d0d-0d7c090495f8_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ddd1b249-9542-4ea6-bd71-653d0a971476" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_43ee496a-cdec-4391-8d0d-0d7c090495f8" xlink:to="loc_us-gaap_SegmentDomain_ddd1b249-9542-4ea6-bd71-653d0a971476" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_GeneralCorporateMember_cad592f1-788b-45c0-8f2f-b40ffb2202df" xlink:href="tg-20231231.xsd#tg_GeneralCorporateMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ddd1b249-9542-4ea6-bd71-653d0a971476" xlink:to="loc_tg_GeneralCorporateMember_cad592f1-788b-45c0-8f2f-b40ffb2202df" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_OperationsOutsideUnitedStatesMember_d5727af7-7e6f-4832-95bb-885c0ef1d4a6" xlink:href="tg-20231231.xsd#tg_OperationsOutsideUnitedStatesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ddd1b249-9542-4ea6-bd71-653d0a971476" xlink:to="loc_tg_OperationsOutsideUnitedStatesMember_d5727af7-7e6f-4832-95bb-885c0ef1d4a6" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d" 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_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e847d70f-8c9c-4147-a7b9-60ff70d97ef0" xlink:to="loc_srt_StatementGeographicalAxis_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d_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_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d" xlink:to="loc_srt_SegmentGeographicalDomain_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b543113c-2dd3-44e1-aa77-c7ff43d1a4d8" 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_75a744c1-ee4f-4915-a5c8-3e1ed3ec719d" xlink:to="loc_srt_SegmentGeographicalDomain_b543113c-2dd3-44e1-aa77-c7ff43d1a4d8" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_country_US_678f3f1f-83e0-457e-8f5e-a088af4d6ccb" 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_b543113c-2dd3-44e1-aa77-c7ff43d1a4d8" xlink:to="loc_country_US_678f3f1f-83e0-457e-8f5e-a088af4d6ccb" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_country_BR_7889830c-1f2f-49ca-b4f3-7bd8dc79a8ad" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_BR"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_b543113c-2dd3-44e1-aa77-c7ff43d1a4d8" xlink:to="loc_country_BR_7889830c-1f2f-49ca-b4f3-7bd8dc79a8ad" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_country_CN_f3cefae7-5659-4e52-aa16-cd42b4aff915" 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_b543113c-2dd3-44e1-aa77-c7ff43d1a4d8" xlink:to="loc_country_CN_f3cefae7-5659-4e52-aa16-cd42b4aff915" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_e5f27984-fe2f-42da-b636-5c0bd32dc2d1" 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_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:to="loc_us-gaap_Assets_e5f27984-fe2f-42da-b636-5c0bd32dc2d1" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_a9971452-634a-4ea7-8c74-ee63d748e4cc" 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_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_a9971452-634a-4ea7-8c74-ee63d748e4cc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_7e479a01-4350-4794-9600-30398dde307f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsAndFederalFundsSold"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:to="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_7e479a01-4350-4794-9600-30398dde307f" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PropertyPlantEquipmentNetIncludingDiscontinuedOperations_64cf03e2-3862-40ec-a78c-39f899087007" xlink:href="tg-20231231.xsd#tg_PropertyPlantEquipmentNetIncludingDiscontinuedOperations"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_046200f7-ab2d-49b1-bd9b-2a16b7ac97bb" xlink:to="loc_tg_PropertyPlantEquipmentNetIncludingDiscontinuedOperations_64cf03e2-3862-40ec-a78c-39f899087007" xlink:type="arc" order="3"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/BusinessSegmentsScheduleOfNetSalesByProductGroupDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#BusinessSegmentsScheduleOfNetSalesByProductGroupDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/BusinessSegmentsScheduleOfNetSalesByProductGroupDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_bb580522-6d24-46af-8e3b-71fefa98d03f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d5cc6885-27da-479f-9166-5c7a57634817" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_bb580522-6d24-46af-8e3b-71fefa98d03f" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d5cc6885-27da-479f-9166-5c7a57634817" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_386e54b7-c033-4393-9edd-8af0a18c1520" 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_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d5cc6885-27da-479f-9166-5c7a57634817" xlink:to="loc_srt_ProductOrServiceAxis_386e54b7-c033-4393-9edd-8af0a18c1520" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_386e54b7-c033-4393-9edd-8af0a18c1520_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_386e54b7-c033-4393-9edd-8af0a18c1520" xlink:to="loc_srt_ProductsAndServicesDomain_386e54b7-c033-4393-9edd-8af0a18c1520_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" 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_386e54b7-c033-4393-9edd-8af0a18c1520" xlink:to="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PersonalCareMaterialsMember_9d351a57-5829-4340-8074-794897a20c59" xlink:href="tg-20231231.xsd#tg_PersonalCareMaterialsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_PersonalCareMaterialsMember_9d351a57-5829-4340-8074-794897a20c59" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_90245306-3592-4bd1-a58c-3c77ad5ab3a9" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_FlexiblePackagingFilmsMember_90245306-3592-4bd1-a58c-3c77ad5ab3a9" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SurfaceProtectionFilmsMember_5be4818c-f7d8-4ebe-a17a-cf5c7c952b6e" xlink:href="tg-20231231.xsd#tg_SurfaceProtectionFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_SurfaceProtectionFilmsMember_5be4818c-f7d8-4ebe-a17a-cf5c7c952b6e" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FilmProductsSubtotalMember_914a3e2e-18a4-46e5-964c-dcbb1e026ab9" xlink:href="tg-20231231.xsd#tg_FilmProductsSubtotalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_FilmProductsSubtotalMember_914a3e2e-18a4-46e5-964c-dcbb1e026ab9" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NonresidentialBuildingAndConstructionMember_60af7d1f-3fa7-47ec-9fdd-ec14aa7aee1f" xlink:href="tg-20231231.xsd#tg_NonresidentialBuildingAndConstructionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_NonresidentialBuildingAndConstructionMember_60af7d1f-3fa7-47ec-9fdd-ec14aa7aee1f" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ConsumerDurablesMember_6424569a-3664-4c56-8290-84686c2be0f4" xlink:href="tg-20231231.xsd#tg_ConsumerDurablesMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_ConsumerDurablesMember_6424569a-3664-4c56-8290-84686c2be0f4" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ResidentialBuildingAndConstructionMember_94b0be63-c5dd-481e-a53f-580930b87211" xlink:href="tg-20231231.xsd#tg_ResidentialBuildingAndConstructionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_ResidentialBuildingAndConstructionMember_94b0be63-c5dd-481e-a53f-580930b87211" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_4c47e791-7dba-4138-8927-b9b2423c6a3c" 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_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_4c47e791-7dba-4138-8927-b9b2423c6a3c" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AutomotiveMember_a048b62c-d332-41e5-b79d-896e149ac972" xlink:href="tg-20231231.xsd#tg_AutomotiveMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_AutomotiveMember_a048b62c-d332-41e5-b79d-896e149ac972" xlink:type="arc" order="8"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DistributionMember_b1e1f01c-c80b-4310-82a9-fc831e47f633" xlink:href="tg-20231231.xsd#tg_DistributionMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_DistributionMember_b1e1f01c-c80b-4310-82a9-fc831e47f633" xlink:type="arc" order="9"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ElectricalMember_e6b7fb33-0892-4ea9-bbf3-e8c891c2b641" xlink:href="tg-20231231.xsd#tg_ElectricalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_ElectricalMember_e6b7fb33-0892-4ea9-bbf3-e8c891c2b641" xlink:type="arc" order="10"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsSubtotalMember_3178be42-2c24-46e1-b32d-30412236a3cc" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsSubtotalMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21a96d50-bf65-43bf-b872-7f63c1e6008d" xlink:to="loc_tg_AluminumExtrusionsSubtotalMember_3178be42-2c24-46e1-b32d-30412236a3cc" xlink:type="arc" order="11"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_93803e02-9f7d-497f-a04e-5686f6e2fc28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d5cc6885-27da-479f-9166-5c7a57634817" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_93803e02-9f7d-497f-a04e-5686f6e2fc28" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_93803e02-9f7d-497f-a04e-5686f6e2fc28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_93803e02-9f7d-497f-a04e-5686f6e2fc28" xlink:to="loc_us-gaap_SegmentDomain_93803e02-9f7d-497f-a04e-5686f6e2fc28_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0bd7e49e-64ba-4e52-84ca-2db276c852b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_93803e02-9f7d-497f-a04e-5686f6e2fc28" xlink:to="loc_us-gaap_SegmentDomain_0bd7e49e-64ba-4e52-84ca-2db276c852b5" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_PEFilmsMember_5f559c54-9341-47c6-ad2f-58692a36b794" xlink:href="tg-20231231.xsd#tg_PEFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bd7e49e-64ba-4e52-84ca-2db276c852b5" xlink:to="loc_tg_PEFilmsMember_5f559c54-9341-47c6-ad2f-58692a36b794" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_AluminumExtrusionsMember_b812bd0c-83f4-46bb-921b-9cdf14868ebc" xlink:href="tg-20231231.xsd#tg_AluminumExtrusionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bd7e49e-64ba-4e52-84ca-2db276c852b5" xlink:to="loc_tg_AluminumExtrusionsMember_b812bd0c-83f4-46bb-921b-9cdf14868ebc" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_FlexiblePackagingFilmsMember_bb52aa7b-be6c-495d-aee8-8ddb56fd482b" xlink:href="tg-20231231.xsd#tg_FlexiblePackagingFilmsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0bd7e49e-64ba-4e52-84ca-2db276c852b5" xlink:to="loc_tg_FlexiblePackagingFilmsMember_bb52aa7b-be6c-495d-aee8-8ddb56fd482b" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_8a3a7276-132e-4c4b-b976-e53dcfc7a583" 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_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_d5cc6885-27da-479f-9166-5c7a57634817" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_8a3a7276-132e-4c4b-b976-e53dcfc7a583" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_8a3a7276-132e-4c4b-b976-e53dcfc7a583_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_8a3a7276-132e-4c4b-b976-e53dcfc7a583" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_8a3a7276-132e-4c4b-b976-e53dcfc7a583_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_2a3dae3b-7ff9-4c62-adc5-c9c297a27059" 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_8a3a7276-132e-4c4b-b976-e53dcfc7a583" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_2a3dae3b-7ff9-4c62-adc5-c9c297a27059" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_15d16c99-283a-46cf-878e-866b5a92ed52" 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_2a3dae3b-7ff9-4c62-adc5-c9c297a27059" xlink:to="loc_us-gaap_ForeignCountryMember_15d16c99-283a-46cf-878e-866b5a92ed52" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_NetSales_32ee4e0d-c100-4302-a670-a5a6b48e4ce7" xlink:href="tg-20231231.xsd#tg_NetSales"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_bb580522-6d24-46af-8e3b-71fefa98d03f" xlink:to="loc_tg_NetSales_32ee4e0d-c100-4302-a670-a5a6b48e4ce7" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_18b0496a-5a37-4e81-a98f-3ba8d8293385" 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_EntityWideInformationRevenueFromExternalCustomerLineItems_bb580522-6d24-46af-8e3b-71fefa98d03f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_18b0496a-5a37-4e81-a98f-3ba8d8293385" xlink:type="arc" order="1"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/SavingsPlanDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#SavingsPlanDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/SavingsPlanDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:href="tg-20231231.xsd#tg_SavingsPlanLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SavingsPlanTable_4a07842f-0c61-4ce7-bd11-6598189c9768" xlink:href="tg-20231231.xsd#tg_SavingsPlanTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_SavingsPlanTable_4a07842f-0c61-4ce7-bd11-6598189c9768" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameAxis_c9118c6f-0b2a-449b-9926-09012063908d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameAxis"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_tg_SavingsPlanTable_4a07842f-0c61-4ce7-bd11-6598189c9768" xlink:to="loc_us-gaap_RetirementPlanNameAxis_c9118c6f-0b2a-449b-9926-09012063908d" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_c9118c6f-0b2a-449b-9926-09012063908d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanNameAxis_c9118c6f-0b2a-449b-9926-09012063908d" xlink:to="loc_us-gaap_RetirementPlanNameDomain_c9118c6f-0b2a-449b-9926-09012063908d_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanNameDomain_04690aa7-acd3-4323-a89b-7e5b0dd75451" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanNameDomain"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanNameAxis_c9118c6f-0b2a-449b-9926-09012063908d" xlink:to="loc_us-gaap_RetirementPlanNameDomain_04690aa7-acd3-4323-a89b-7e5b0dd75451" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SavingsPlanMember_d14f934b-e71d-4d14-846e-24e2b28e1f93" xlink:href="tg-20231231.xsd#tg_SavingsPlanMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanNameDomain_04690aa7-acd3-4323-a89b-7e5b0dd75451" xlink:to="loc_tg_SavingsPlanMember_d14f934b-e71d-4d14-846e-24e2b28e1f93" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedContributionPlanEmployerEmployeeMatch_db581b37-e513-4dd1-959d-24548d4ddfae" xlink:href="tg-20231231.xsd#tg_DefinedContributionPlanEmployerEmployeeMatch"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_DefinedContributionPlanEmployerEmployeeMatch_db581b37-e513-4dd1-959d-24548d4ddfae" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedContributionPlanEmployerEmployeeContribution_eb2d7603-766f-4c7f-b9c5-dfc1640c2515" xlink:href="tg-20231231.xsd#tg_DefinedContributionPlanEmployerEmployeeContribution"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_DefinedContributionPlanEmployerEmployeeContribution_eb2d7603-766f-4c7f-b9c5-dfc1640c2515" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_a8bbc7eb-baea-4251-bcdc-3f08388be084" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_a8bbc7eb-baea-4251-bcdc-3f08388be084" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_DefinedContributionPlanAutomaticEnrollmentEmployeeContributionPercentage_e310c6a4-f7cf-45fa-961e-3f02731e6351" xlink:href="tg-20231231.xsd#tg_DefinedContributionPlanAutomaticEnrollmentEmployeeContributionPercentage"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_DefinedContributionPlanAutomaticEnrollmentEmployeeContributionPercentage_e310c6a4-f7cf-45fa-961e-3f02731e6351" xlink:type="arc" order="3"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_d89ae806-ea7b-434d-ae55-23b2132aa0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_d89ae806-ea7b-434d-ae55-23b2132aa0e6" xlink:type="arc" order="4"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_LiabilityUnderRestorationBenefitPlan_ae1c0c02-1cf2-419d-b6ed-8f7db541856a" xlink:href="tg-20231231.xsd#tg_LiabilityUnderRestorationBenefitPlan"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_LiabilityUnderRestorationBenefitPlan_ae1c0c02-1cf2-419d-b6ed-8f7db541856a" xlink:type="arc" order="5"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_SharesHeldByRestorationPlan_388d872e-ee3d-43fc-abf0-cbf043d46256" xlink:href="tg-20231231.xsd#tg_SharesHeldByRestorationPlan"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_SharesHeldByRestorationPlan_388d872e-ee3d-43fc-abf0-cbf043d46256" xlink:type="arc" order="6"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CommonStockSharesPurchasedForEmployeeTrustShares_4a5fddb6-e4d3-4faf-9bcb-6cf81bed7c60" xlink:href="tg-20231231.xsd#tg_CommonStockSharesPurchasedForEmployeeTrustShares"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_CommonStockSharesPurchasedForEmployeeTrustShares_4a5fddb6-e4d3-4faf-9bcb-6cf81bed7c60" xlink:type="arc" order="7"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_CommonStockSharesPurchasedForEmployeeTrust_e9ac3e09-8cf5-45f3-b60d-afaf7e6f5286" xlink:href="tg-20231231.xsd#tg_CommonStockSharesPurchasedForEmployeeTrust"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tg_SavingsPlanLineItems_9b2d120d-5168-4bf3-9601-2bdb0d17e0dc" xlink:to="loc_tg_CommonStockSharesPurchasedForEmployeeTrust_e9ac3e09-8cf5-45f3-b60d-afaf7e6f5286" xlink:type="arc" order="8"/>
</link:definitionLink>
<link:roleRef roleURI="http://www.tredegar.com/role/SupplyChainFinancingNarrativeDetails" xlink:type="simple" xlink:href="tg-20231231.xsd#SupplyChainFinancingNarrativeDetails"/>
<link:definitionLink xlink:role="http://www.tredegar.com/role/SupplyChainFinancingNarrativeDetails" xlink:type="extended">
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_351c4b01-eb98-4502-94e4-aab014310243" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:to="loc_us-gaap_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_351c4b01-eb98-4502-94e4-aab014310243" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_e5924736-5c8a-478d-9a77-1b93d9695b26" 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_ScheduleOfImpairedLongLivedAssetsHeldAndUsedTable_351c4b01-eb98-4502-94e4-aab014310243" xlink:to="loc_srt_CounterpartyNameAxis_e5924736-5c8a-478d-9a77-1b93d9695b26" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_e5924736-5c8a-478d-9a77-1b93d9695b26_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_e5924736-5c8a-478d-9a77-1b93d9695b26" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_e5924736-5c8a-478d-9a77-1b93d9695b26_default" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ef17b45b-c7bc-4acf-a108-ea0ee3f0d582" 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_e5924736-5c8a-478d-9a77-1b93d9695b26" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ef17b45b-c7bc-4acf-a108-ea0ee3f0d582" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_tg_ThirdPartyFinancialInstitutionsMember_ecf8038f-52cc-447f-9738-dc57f1b735aa" xlink:href="tg-20231231.xsd#tg_ThirdPartyFinancialInstitutionsMember"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ef17b45b-c7bc-4acf-a108-ea0ee3f0d582" xlink:to="loc_tg_ThirdPartyFinancialInstitutionsMember_ecf8038f-52cc-447f-9738-dc57f1b735aa" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligationIncrease_da7835bb-5dde-4e82-b670-e7c613e1b22d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplierFinanceProgramObligationIncrease"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:to="loc_us-gaap_SupplierFinanceProgramObligationIncrease_da7835bb-5dde-4e82-b670-e7c613e1b22d" xlink:type="arc" order="0"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligationDecreaseSettlement_8282906b-15a1-4ed6-a8da-03660ce48b50" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplierFinanceProgramObligationDecreaseSettlement"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:to="loc_us-gaap_SupplierFinanceProgramObligationDecreaseSettlement_8282906b-15a1-4ed6-a8da-03660ce48b50" xlink:type="arc" order="1"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplierFinanceProgramObligationPeriodIncreaseDecrease_8c7c4d75-f9ca-4228-81c4-b9e856dcc375" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplierFinanceProgramObligationPeriodIncreaseDecrease"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:to="loc_us-gaap_SupplierFinanceProgramObligationPeriodIncreaseDecrease_8c7c4d75-f9ca-4228-81c4-b9e856dcc375" xlink:type="arc" order="2"/>
<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_07163224-a7bc-4ca4-a24a-87dfbf2260fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems_7b6e6f83-9a2c-40dd-8cfa-b741c4cf8c47" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_07163224-a7bc-4ca4-a24a-87dfbf2260fe" xlink:type="arc" order="3"/>
</link:definitionLink>
</link:linkbase>


21 Previous Filings that this Filing References

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

12/28/23  Tredegar Corp.                    8-K:1,2,9  12/27/23   12:1.9M                                   Donnelley … Solutions/FA
11/06/23  Tredegar Corp.                    8-K:1,9    10/31/23   11:256K                                   Donnelley … Solutions/FA
10/04/23  Tredegar Corp.                    8-K:5,9     9/29/23   11:192K                                   Donnelley … Solutions/FA
 9/05/23  Tredegar Corp.                    8-K:1,7,9   9/01/23   12:791K                                   Donnelley … Solutions/FA
 8/09/23  Tredegar Corp.                    10-Q        6/30/23   65:8.6M
 8/07/23  Tredegar Corp.                    8-K:5,9     8/07/23   12:264K
 6/30/22  Tredegar Corp.                    8-K:1,2,9   6/29/22   13:1.3M                                   Donnelley … Solutions/FA
 3/25/21  Tredegar Corp.                    DEF 14A     5/06/21    1:3.5M                                   Broadridge Fin’l So… Inc
 5/11/20  Tredegar Corp.                    10-Q        3/31/20   76:11M
 3/16/20  Tredegar Corp.                    10-K       12/31/19  136:22M
 3/19/19  Tredegar Corp.                    S-8         3/19/19    5:142K                                   Broadridge Fin’l… Inc/FA
 5/07/18  Tredegar Corp.                    8-K:4,5,7,9 5/01/18    5:5.6M                                   Broadridge Fin’l So… Inc
 2/24/17  Tredegar Corp.                    8-K:5,9     2/20/17    2:133K                                   Broadridge Fin’l So… Inc
 5/06/16  Tredegar Corp.                    8-K:5,7,9   5/06/16    4:4.8M
 3/01/16  Tredegar Corp.                    8-K:5,9     2/25/16    4:126K                                   Broadridge Fin’l So… Inc
 2/28/14  Tredegar Corp.                    10-K       12/31/13  129:24M
 5/29/13  Tredegar Corp.                    8-K:5,7,9   5/22/13    5:3.7M                                   Broadridge Fin’l So… Inc
 2/27/13  Tredegar Corp.                    8-K:5,9     2/21/13    4:231K                                   Broadridge Fin’l So… Inc
 4/14/09  Tredegar Corp.                    DEF 14A     5/19/09    1:1.1M                                   Edgar Ease Svc Bureau/FA
 3/16/05  Tredegar Corp.                    10-K       12/31/04   24:2.7M                                   Edgar Ease Svc Bureau/FA
12/30/04  Tredegar Corp.                    8-K:1,9    12/28/04    2:21K
Top
Filing Submission 0000850429-24-000004   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
AboutPrivacyRedactionsHelp — Tue., May 14, 9:58:49.2am ET