<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:6ee30501-c3eb-42d0-b672-52faceb02c88,g:cb4c1161-acb0-459b-bd22-316bec71c7bf-->
<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.apog.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="apog-20251129.xsd#CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_6f057954-9bbb-4652-a6b4-92e35ddff9f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_21ab2e6b-4d06-4f45-abcc-b6fe71dff17e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_6f057954-9bbb-4652-a6b4-92e35ddff9f2" xlink:to="loc_us-gaap_StatementTable_21ab2e6b-4d06-4f45-abcc-b6fe71dff17e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f80b8ef9-129d-41d6-99c6-bddabda7102f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_21ab2e6b-4d06-4f45-abcc-b6fe71dff17e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f80b8ef9-129d-41d6-99c6-bddabda7102f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f80b8ef9-129d-41d6-99c6-bddabda7102f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f80b8ef9-129d-41d6-99c6-bddabda7102f" xlink:to="loc_us-gaap_EquityComponentDomain_f80b8ef9-129d-41d6-99c6-bddabda7102f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f80b8ef9-129d-41d6-99c6-bddabda7102f" xlink:to="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_ab98f205-698c-4f98-87a0-2709eadde2ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:to="loc_us-gaap_CommonStockMember_ab98f205-698c-4f98-87a0-2709eadde2ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_81d3a03b-2928-4e06-a336-546475a45448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_81d3a03b-2928-4e06-a336-546475a45448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_83a97446-fd16-4e66-be93-67938da7e113" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:to="loc_us-gaap_RetainedEarningsMember_83a97446-fd16-4e66-be93-67938da7e113" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad40fe88-b84e-455a-8634-3e8c925ef908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_95fbc856-343e-4cfa-a697-6269c8a13701" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad40fe88-b84e-455a-8634-3e8c925ef908" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6f057954-9bbb-4652-a6b4-92e35ddff9f2" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_a2cc6c12-f939-41a1-83d3-f88cb45e1638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_a2cc6c12-f939-41a1-83d3-f88cb45e1638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f49ba145-c775-42ad-bef3-e91eef60e9ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockholdersEquity_f49ba145-c775-42ad-bef3-e91eef60e9ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_64a9a856-efc5-4507-84b6-17543040f507" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_NetIncomeLoss_64a9a856-efc5-4507-84b6-17543040f507" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_307d27e6-28b6-4e64-93d5-a12bc7af1a37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_307d27e6-28b6-4e64-93d5-a12bc7af1a37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019b4c16-901f-7825-9031-1ce8333b2d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019b4c16-901f-7825-9031-1ce8333b2d3b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_SharesIssuedNetOfCancellations_9566a9a3-d220-490b-8ecd-3cccd93ea000" xlink:href="apog-20251129.xsd#apog_SharesIssuedNetOfCancellations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_apog_SharesIssuedNetOfCancellations_9566a9a3-d220-490b-8ecd-3cccd93ea000" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_f80d6aa6-54ca-4f3f-a2df-866238bbd00c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_f80d6aa6-54ca-4f3f-a2df-866238bbd00c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited_c0bf3c7c-8b86-4776-8ad6-2941b13fe443" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited_c0bf3c7c-8b86-4776-8ad6-2941b13fe443" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_54eb301b-ceb4-464f-8620-79aa457f5451" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_54eb301b-ceb4-464f-8620-79aa457f5451" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_32150351-4562-40fa-b1a7-7c42cc6db70c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_32150351-4562-40fa-b1a7-7c42cc6db70c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_bc5824f1-5ee2-4a6c-8c8f-287f5eefafe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_bc5824f1-5ee2-4a6c-8c8f-287f5eefafe1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRedeemedOrCalledDuringPeriodShares_b00bb4e2-809f-4b50-b8a0-32923aec8eca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRedeemedOrCalledDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockRedeemedOrCalledDuringPeriodShares_b00bb4e2-809f-4b50-b8a0-32923aec8eca" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_7d15eae6-d525-4894-b970-e085f30c6355" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRedeemedOrCalledDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_7d15eae6-d525-4894-b970-e085f30c6355" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_357ec0df-8ad9-4955-83ba-23bd27b137aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_24901207-f7ed-4d8c-a509-be49533857e5" xlink:to="loc_us-gaap_DividendsCommonStockCash_357ec0df-8ad9-4955-83ba-23bd27b137aa" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_06e8763a-8ae9-4309-84be-80f24490b47c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_3927dc0d-d21f-4cab-9475-860122e4aeda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofRevenueDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RevenueReceivablesandContractAssetsandLiabilitiesScheduleofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_a9e379e4-8547-41e5-b632-0bfb524080ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_819dc04c-3266-4db4-aacd-cd7f869a31e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a9e379e4-8547-41e5-b632-0bfb524080ac" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_819dc04c-3266-4db4-aacd-cd7f869a31e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_f596a6c8-23df-4232-861b-53a650d0ec5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_819dc04c-3266-4db4-aacd-cd7f869a31e4" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_f596a6c8-23df-4232-861b-53a650d0ec5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_f596a6c8-23df-4232-861b-53a650d0ec5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_f596a6c8-23df-4232-861b-53a650d0ec5d" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_f596a6c8-23df-4232-861b-53a650d0ec5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_6def6187-9902-4ec2-b682-4bcf615facd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_f596a6c8-23df-4232-861b-53a650d0ec5d" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_6def6187-9902-4ec2-b682-4bcf615facd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_93c856f2-ff84-4990-a4d6-f91c3343aa0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_6def6187-9902-4ec2-b682-4bcf615facd1" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_93c856f2-ff84-4990-a4d6-f91c3343aa0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_TransferredOverTimeInputMethodMember_e6d8475f-81df-4610-a8db-3ff76966912c" xlink:href="apog-20251129.xsd#apog_TransferredOverTimeInputMethodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_6def6187-9902-4ec2-b682-4bcf615facd1" xlink:to="loc_apog_TransferredOverTimeInputMethodMember_e6d8475f-81df-4610-a8db-3ff76966912c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_TransferredOverTimeOutputMethodMember_0e782e00-1634-454d-93e7-a8a98acd10ce" xlink:href="apog-20251129.xsd#apog_TransferredOverTimeOutputMethodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_6def6187-9902-4ec2-b682-4bcf615facd1" xlink:to="loc_apog_TransferredOverTimeOutputMethodMember_0e782e00-1634-454d-93e7-a8a98acd10ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f50cf5b0-50a1-4296-a872-35f4ba249f19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a9e379e4-8547-41e5-b632-0bfb524080ac" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f50cf5b0-50a1-4296-a872-35f4ba249f19" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesAccountsScheduleofReceivableDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RevenueReceivablesandContractAssetsandLiabilitiesAccountsScheduleofReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesAccountsScheduleofReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_43818a19-a37c-4e60-867f-6056b8cebf21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3af80b3f-f9ee-4254-8b4a-6b073c693a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_43818a19-a37c-4e60-867f-6056b8cebf21" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3af80b3f-f9ee-4254-8b4a-6b073c693a0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_e4a27efb-d419-46ac-b0ad-68b915b525c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_3af80b3f-f9ee-4254-8b4a-6b073c693a0b" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_e4a27efb-d419-46ac-b0ad-68b915b525c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_e4a27efb-d419-46ac-b0ad-68b915b525c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_e4a27efb-d419-46ac-b0ad-68b915b525c5" xlink:to="loc_us-gaap_ReceivableTypeDomain_e4a27efb-d419-46ac-b0ad-68b915b525c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_8fcf28db-93bf-4108-a056-4f8e6b57a013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_e4a27efb-d419-46ac-b0ad-68b915b525c5" xlink:to="loc_us-gaap_ReceivableTypeDomain_8fcf28db-93bf-4108-a056-4f8e6b57a013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_afe02e7d-b74d-429d-82b9-793366947d14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_8fcf28db-93bf-4108-a056-4f8e6b57a013" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_afe02e7d-b74d-429d-82b9-793366947d14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_AccountsReceivableConstructionContractsMember_2f9cca85-af45-42b4-98ed-e9216d6cce47" xlink:href="apog-20251129.xsd#apog_AccountsReceivableConstructionContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_8fcf28db-93bf-4108-a056-4f8e6b57a013" xlink:to="loc_apog_AccountsReceivableConstructionContractsMember_2f9cca85-af45-42b4-98ed-e9216d6cce47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGross_43275e85-0f25-4e8a-896d-6e1415dfb19e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_43818a19-a37c-4e60-867f-6056b8cebf21" xlink:to="loc_us-gaap_AccountsReceivableGross_43275e85-0f25-4e8a-896d-6e1415dfb19e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_d7d8e1c8-c9f2-4804-9391-378b5009f62b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_43818a19-a37c-4e60-867f-6056b8cebf21" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_d7d8e1c8-c9f2-4804-9391-378b5009f62b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_17e0821e-de42-4c09-86da-b67bca178b90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_43818a19-a37c-4e60-867f-6056b8cebf21" xlink:to="loc_us-gaap_AccountsReceivableNet_17e0821e-de42-4c09-86da-b67bca178b90" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f1e4d110-810a-4f22-9e1c-8c1751314028" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f1e4d110-810a-4f22-9e1c-8c1751314028" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6e85646d-4972-4779-a5a3-576cb1ab3120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f1e4d110-810a-4f22-9e1c-8c1751314028" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_6e85646d-4972-4779-a5a3-576cb1ab3120" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_979f03bb-5863-4b2b-bb5f-37fe20e23a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_979f03bb-5863-4b2b-bb5f-37fe20e23a4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_76cb6bef-8054-4e50-ac00-da350a8d93b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_76cb6bef-8054-4e50-ac00-da350a8d93b7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails_1" xlink:type="simple" xlink:href="apog-20251129.xsd#RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails_1"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofOthercontractrelateddisclosuresDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f1e4d110-810a-4f22-9e1c-8c1751314028" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f1e4d110-810a-4f22-9e1c-8c1751314028" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_979f03bb-5863-4b2b-bb5f-37fe20e23a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_979f03bb-5863-4b2b-bb5f-37fe20e23a4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_76cb6bef-8054-4e50-ac00-da350a8d93b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3476df22-95ec-42cd-8b57-63eecb0beb7e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_76cb6bef-8054-4e50-ac00-da350a8d93b7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofImpactofAdjustmentsonOperatingIncomeDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RevenueReceivablesandContractAssetsandLiabilitiesScheduleofImpactofAdjustmentsonOperatingIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RevenueReceivablesandContractAssetsandLiabilitiesScheduleofImpactofAdjustmentsonOperatingIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_4c989ec6-9394-4e95-93f9-3467e7c9b2ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_0def12e3-6f05-4747-9f8a-15c8a043c3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4c989ec6-9394-4e95-93f9-3467e7c9b2ff" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_0def12e3-6f05-4747-9f8a-15c8a043c3b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_f8f95ec1-3531-456e-b66b-a497d5648ae6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0def12e3-6f05-4747-9f8a-15c8a043c3b2" xlink:to="loc_srt_RestatementAxis_f8f95ec1-3531-456e-b66b-a497d5648ae6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f8f95ec1-3531-456e-b66b-a497d5648ae6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_f8f95ec1-3531-456e-b66b-a497d5648ae6" xlink:to="loc_srt_RestatementDomain_f8f95ec1-3531-456e-b66b-a497d5648ae6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_1737c748-8403-49c7-a395-a93630fa041d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_f8f95ec1-3531-456e-b66b-a497d5648ae6" xlink:to="loc_srt_RestatementDomain_1737c748-8403-49c7-a395-a93630fa041d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_1708c0f7-daa3-4d1f-8a16-d77cf1f1bcc4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_1737c748-8403-49c7-a395-a93630fa041d" xlink:to="loc_srt_RestatementAdjustmentMember_1708c0f7-daa3-4d1f-8a16-d77cf1f1bcc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_317384ff-1e4a-4e0a-a9f2-e53061922309" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4c989ec6-9394-4e95-93f9-3467e7c9b2ff" xlink:to="loc_us-gaap_OperatingIncomeLoss_317384ff-1e4a-4e0a-a9f2-e53061922309" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_4fd7accc-5c0d-4828-bc64-d32c6de33108" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4c989ec6-9394-4e95-93f9-3467e7c9b2ff" xlink:to="loc_us-gaap_EarningsPerShareAbstract_4fd7accc-5c0d-4828-bc64-d32c6de33108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_76700e1e-7896-46b0-9962-c466106f35c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_4fd7accc-5c0d-4828-bc64-d32c6de33108" xlink:to="loc_us-gaap_EarningsPerShareBasic_76700e1e-7896-46b0-9962-c466106f35c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_7348b03a-1ebc-48a6-8bb8-3af859647be6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_4fd7accc-5c0d-4828-bc64-d32c6de33108" xlink:to="loc_us-gaap_EarningsPerShareDiluted_7348b03a-1ebc-48a6-8bb8-3af859647be6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/FinancialInstrumentsScheduleofAvailableforSaleMarketableSecuritiesDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#FinancialInstrumentsScheduleofAvailableforSaleMarketableSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/FinancialInstrumentsScheduleofAvailableforSaleMarketableSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_5f38ba04-5ad3-4ccd-b850-30d20a802415" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_5f38ba04-5ad3-4ccd-b850-30d20a802415" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_5f38ba04-5ad3-4ccd-b850-30d20a802415" xlink:to="loc_us-gaap_FinancialInstrumentAxis_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ad8a8c4a-e97a-4ff8-9f04-d330e09e9b06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_33bce0fa-ee94-42ac-bf3c-59f0c70f1c58" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ad8a8c4a-e97a-4ff8-9f04-d330e09e9b06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_MunicipalandCorporateBondsMember_6886d76f-6023-4dd9-8e15-d9672000d790" xlink:href="apog-20251129.xsd#apog_MunicipalandCorporateBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ad8a8c4a-e97a-4ff8-9f04-d330e09e9b06" xlink:to="loc_apog_MunicipalandCorporateBondsMember_6886d76f-6023-4dd9-8e15-d9672000d790" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_f143ef9c-a86f-4051-b927-45f6e53ee387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_f143ef9c-a86f-4051-b927-45f6e53ee387" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_dddd79f0-9da2-4326-a0f7-efb7c41c412e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain_dddd79f0-9da2-4326-a0f7-efb7c41c412e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_b2014922-2cf7-44de-93d5-29f35d10c49e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss_b2014922-2cf7-44de-93d5-29f35d10c49e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_3299e6fe-8a12-4bdd-aedb-06012eb72699" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_d15951d8-b7ca-45f9-80dd-335df899062b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_3299e6fe-8a12-4bdd-aedb-06012eb72699" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/FinancialInstrumentsAdditionalInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#FinancialInstrumentsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/FinancialInstrumentsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_290307c3-c13c-4fdb-9acb-4c12798cca94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_70ef89fd-46e9-4871-8e18-a9efab0029fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_290307c3-c13c-4fdb-9acb-4c12798cca94" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_70ef89fd-46e9-4871-8e18-a9efab0029fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_61e4cf41-fc36-42a9-9855-a6d837b32e28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_70ef89fd-46e9-4871-8e18-a9efab0029fe" xlink:to="loc_us-gaap_HedgingDesignationAxis_61e4cf41-fc36-42a9-9855-a6d837b32e28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_61e4cf41-fc36-42a9-9855-a6d837b32e28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_61e4cf41-fc36-42a9-9855-a6d837b32e28" xlink:to="loc_us-gaap_HedgingDesignationDomain_61e4cf41-fc36-42a9-9855-a6d837b32e28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_1362df90-509b-45b4-99d7-f863b6266587" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_61e4cf41-fc36-42a9-9855-a6d837b32e28" xlink:to="loc_us-gaap_HedgingDesignationDomain_1362df90-509b-45b4-99d7-f863b6266587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_9d1bb91b-b03d-4062-a702-70594a41ae06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1362df90-509b-45b4-99d7-f863b6266587" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_9d1bb91b-b03d-4062-a702-70594a41ae06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_087b519a-21d4-4c33-80c9-245c6e8ada26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_70ef89fd-46e9-4871-8e18-a9efab0029fe" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_087b519a-21d4-4c33-80c9-245c6e8ada26" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_087b519a-21d4-4c33-80c9-245c6e8ada26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_087b519a-21d4-4c33-80c9-245c6e8ada26" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_087b519a-21d4-4c33-80c9-245c6e8ada26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d968283a-805a-490a-a70b-4279a356623f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_087b519a-21d4-4c33-80c9-245c6e8ada26" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d968283a-805a-490a-a70b-4279a356623f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_f695babf-a5da-4b3a-a5e2-9808f1c6f01b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_d968283a-805a-490a-a70b-4279a356623f" xlink:to="loc_us-gaap_InterestRateSwapMember_f695babf-a5da-4b3a-a5e2-9808f1c6f01b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_c1a85257-3fbe-4f55-9e5f-7ff8820340c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_290307c3-c13c-4fdb-9acb-4c12798cca94" xlink:to="loc_us-gaap_DerivativeNotionalAmount_c1a85257-3fbe-4f55-9e5f-7ff8820340c7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/FinancialInstrumentsScheduleofFairValueMeasurementsDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#FinancialInstrumentsScheduleofFairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/FinancialInstrumentsScheduleofFairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_25c64062-1d9e-4493-8380-adc863024249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_25c64062-1d9e-4493-8380-adc863024249" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7cbe0e79-5847-4680-a847-026012fd0c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_25c64062-1d9e-4493-8380-adc863024249" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7cbe0e79-5847-4680-a847-026012fd0c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7cbe0e79-5847-4680-a847-026012fd0c7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7cbe0e79-5847-4680-a847-026012fd0c7b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7cbe0e79-5847-4680-a847-026012fd0c7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_91081758-518b-47de-abbc-bcec6079f725" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7cbe0e79-5847-4680-a847-026012fd0c7b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_91081758-518b-47de-abbc-bcec6079f725" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_f1eb1223-d5c2-4d6d-9670-9860903abe1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_91081758-518b-47de-abbc-bcec6079f725" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_f1eb1223-d5c2-4d6d-9670-9860903abe1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_e70a8073-8f54-4755-a149-9e935a77d572" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_91081758-518b-47de-abbc-bcec6079f725" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_e70a8073-8f54-4755-a149-9e935a77d572" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_bc1c0197-53d3-4328-a4f7-46ae7e12a90d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_25c64062-1d9e-4493-8380-adc863024249" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_bc1c0197-53d3-4328-a4f7-46ae7e12a90d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bc1c0197-53d3-4328-a4f7-46ae7e12a90d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bc1c0197-53d3-4328-a4f7-46ae7e12a90d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bc1c0197-53d3-4328-a4f7-46ae7e12a90d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c961719a-7ffa-4ea5-ab88-e939a0989218" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_bc1c0197-53d3-4328-a4f7-46ae7e12a90d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c961719a-7ffa-4ea5-ab88-e939a0989218" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_d9a247cc-2106-4fe5-bd9c-7d40be286791" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c961719a-7ffa-4ea5-ab88-e939a0989218" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_d9a247cc-2106-4fe5-bd9c-7d40be286791" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_27437168-b339-48a4-bc25-6c8a2a839ebd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c961719a-7ffa-4ea5-ab88-e939a0989218" xlink:to="loc_us-gaap_InterestRateSwapMember_27437168-b339-48a4-bc25-6c8a2a839ebd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsAtCarryingValue_199f9dab-f709-49da-b803-3ca5d0e978be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:to="loc_us-gaap_MoneyMarketFundsAtCarryingValue_199f9dab-f709-49da-b803-3ca5d0e978be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019b0515-6ab3-7811-b6eb-f0a4fe226f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019b0515-6ab3-7811-b6eb-f0a4fe226f6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_35764d5b-ff5f-4746-a4c7-eaf8eb989167" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:to="loc_us-gaap_DerivativeAssets_35764d5b-ff5f-4746-a4c7-eaf8eb989167" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_794cf0a0-d496-42a3-a4d0-735d48beb739" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_34f064de-1808-4882-b21d-cf982a9ca5d4" xlink:to="loc_us-gaap_DerivativeLiabilities_794cf0a0-d496-42a3-a4d0-735d48beb739" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/DebtAdditionalInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#DebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/DebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1b90b872-d958-4d2d-9927-b990d4e564af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_DebtInstrumentAxis_1b90b872-d958-4d2d-9927-b990d4e564af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1b90b872-d958-4d2d-9927-b990d4e564af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1b90b872-d958-4d2d-9927-b990d4e564af" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1b90b872-d958-4d2d-9927-b990d4e564af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fed57a86-3f4e-468b-99a5-358944944751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1b90b872-d958-4d2d-9927-b990d4e564af" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fed57a86-3f4e-468b-99a5-358944944751" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_UnsecuredSeniorCreditFacilityMember_544ce25f-51bb-41b6-a400-605844a9f16d" xlink:href="apog-20251129.xsd#apog_UnsecuredSeniorCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fed57a86-3f4e-468b-99a5-358944944751" xlink:to="loc_apog_UnsecuredSeniorCreditFacilityMember_544ce25f-51bb-41b6-a400-605844a9f16d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6cfb535a-0381-413f-932d-a942d683cfda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6cfb535a-0381-413f-932d-a942d683cfda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6cfb535a-0381-413f-932d-a942d683cfda_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6cfb535a-0381-413f-932d-a942d683cfda" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6cfb535a-0381-413f-932d-a942d683cfda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_de9869b8-c121-4dbd-bf38-9e6d7e3a8f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6cfb535a-0381-413f-932d-a942d683cfda" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_de9869b8-c121-4dbd-bf38-9e6d7e3a8f4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_2241eae2-1670-4c82-9e6f-a3380a33f647" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_de9869b8-c121-4dbd-bf38-9e6d7e3a8f4b" xlink:to="loc_us-gaap_LineOfCreditMember_2241eae2-1670-4c82-9e6f-a3380a33f647" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_8cbea047-5e43-488b-9839-20767843ad55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_CreditFacilityAxis_8cbea047-5e43-488b-9839-20767843ad55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_8cbea047-5e43-488b-9839-20767843ad55_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_8cbea047-5e43-488b-9839-20767843ad55" xlink:to="loc_us-gaap_CreditFacilityDomain_8cbea047-5e43-488b-9839-20767843ad55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_efe53397-8383-44c4-8c5c-5fb393f5eba3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_8cbea047-5e43-488b-9839-20767843ad55" xlink:to="loc_us-gaap_CreditFacilityDomain_efe53397-8383-44c4-8c5c-5fb393f5eba3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_1f8b9c71-230f-41ba-bbfa-734376fda95f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_efe53397-8383-44c4-8c5c-5fb393f5eba3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_1f8b9c71-230f-41ba-bbfa-734376fda95f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_TermLoanFacilityMember_3e320717-f2fd-4528-8cae-90fef032e8df" xlink:href="apog-20251129.xsd#apog_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_efe53397-8383-44c4-8c5c-5fb393f5eba3" xlink:to="loc_apog_TermLoanFacilityMember_3e320717-f2fd-4528-8cae-90fef032e8df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_RevolvingCreditFacilityCADMember_0cd92546-fc71-42e2-b754-0a1ccc557573" xlink:href="apog-20251129.xsd#apog_RevolvingCreditFacilityCADMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_efe53397-8383-44c4-8c5c-5fb393f5eba3" xlink:to="loc_apog_RevolvingCreditFacilityCADMember_0cd92546-fc71-42e2-b754-0a1ccc557573" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_82724582-188b-46b4-8ca8-71561e5318a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_82724582-188b-46b4-8ca8-71561e5318a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_82724582-188b-46b4-8ca8-71561e5318a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_82724582-188b-46b4-8ca8-71561e5318a3" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_82724582-188b-46b4-8ca8-71561e5318a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_3457e0e5-16ba-4ae7-a0b2-82a957b1c903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_82724582-188b-46b4-8ca8-71561e5318a3" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_3457e0e5-16ba-4ae7-a0b2-82a957b1c903" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_WellsFargoBankN.A.Member_b7cb6102-dec3-4f0b-939d-29b446db575b" xlink:href="apog-20251129.xsd#apog_WellsFargoBankN.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_3457e0e5-16ba-4ae7-a0b2-82a957b1c903" xlink:to="loc_apog_WellsFargoBankN.A.Member_b7cb6102-dec3-4f0b-939d-29b446db575b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BankOfMontrealMember_a653b320-c5e7-4c60-b9b9-402fc27ec0b6" xlink:href="apog-20251129.xsd#apog_BankOfMontrealMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_3457e0e5-16ba-4ae7-a0b2-82a957b1c903" xlink:to="loc_apog_BankOfMontrealMember_a653b320-c5e7-4c60-b9b9-402fc27ec0b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtFeesAxisAxis_52d4adfb-2d57-47de-99ba-2168e2e66601" xlink:href="apog-20251129.xsd#apog_DebtFeesAxisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_apog_DebtFeesAxisAxis_52d4adfb-2d57-47de-99ba-2168e2e66601" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtFeesAxisDomain_52d4adfb-2d57-47de-99ba-2168e2e66601_default" xlink:href="apog-20251129.xsd#apog_DebtFeesAxisDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_apog_DebtFeesAxisAxis_52d4adfb-2d57-47de-99ba-2168e2e66601" xlink:to="loc_apog_DebtFeesAxisDomain_52d4adfb-2d57-47de-99ba-2168e2e66601_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtFeesAxisDomain_ee4d0c5b-8761-4211-b09d-66c0321c6b3f" xlink:href="apog-20251129.xsd#apog_DebtFeesAxisDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_apog_DebtFeesAxisAxis_52d4adfb-2d57-47de-99ba-2168e2e66601" xlink:to="loc_apog_DebtFeesAxisDomain_ee4d0c5b-8761-4211-b09d-66c0321c6b3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_LenderFeesMember_313c5071-e0fd-458f-be50-aed3867f50c2" xlink:href="apog-20251129.xsd#apog_LenderFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apog_DebtFeesAxisDomain_ee4d0c5b-8761-4211-b09d-66c0321c6b3f" xlink:to="loc_apog_LenderFeesMember_313c5071-e0fd-458f-be50-aed3867f50c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ThirdPartyFeesMember_afaa936a-429b-481b-bbcc-5536247ef08c" xlink:href="apog-20251129.xsd#apog_ThirdPartyFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apog_DebtFeesAxisDomain_ee4d0c5b-8761-4211-b09d-66c0321c6b3f" xlink:to="loc_apog_ThirdPartyFeesMember_afaa936a-429b-481b-bbcc-5536247ef08c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtCovenantAxis_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7" xlink:href="apog-20251129.xsd#apog_DebtCovenantAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_apog_DebtCovenantAxis_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtCovenantDomain_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7_default" xlink:href="apog-20251129.xsd#apog_DebtCovenantDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_apog_DebtCovenantAxis_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7" xlink:to="loc_apog_DebtCovenantDomain_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtCovenantDomain_e4f6836b-b6d4-4e02-bcc8-44bd27d1e9c7" xlink:href="apog-20251129.xsd#apog_DebtCovenantDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_apog_DebtCovenantAxis_8c4c7ae5-ca4b-4842-baef-1ae35e2e96e7" xlink:to="loc_apog_DebtCovenantDomain_e4f6836b-b6d4-4e02-bcc8-44bd27d1e9c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_AcquisitionHolidayConditionMember_7f9b3325-19df-4807-99ec-78466509c7be" xlink:href="apog-20251129.xsd#apog_AcquisitionHolidayConditionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apog_DebtCovenantDomain_e4f6836b-b6d4-4e02-bcc8-44bd27d1e9c7" xlink:to="loc_apog_AcquisitionHolidayConditionMember_7f9b3325-19df-4807-99ec-78466509c7be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d176f3d3-f36d-4081-b753-33d6420b687a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_srt_RangeAxis_d176f3d3-f36d-4081-b753-33d6420b687a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d176f3d3-f36d-4081-b753-33d6420b687a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d176f3d3-f36d-4081-b753-33d6420b687a" xlink:to="loc_srt_RangeMember_d176f3d3-f36d-4081-b753-33d6420b687a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2bac0237-471a-4711-8b5e-32bfaed79f02" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d176f3d3-f36d-4081-b753-33d6420b687a" xlink:to="loc_srt_RangeMember_2bac0237-471a-4711-8b5e-32bfaed79f02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6f1c510b-0e1d-400d-bb0b-84d35a38b34d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2bac0237-471a-4711-8b5e-32bfaed79f02" xlink:to="loc_srt_MinimumMember_6f1c510b-0e1d-400d-bb0b-84d35a38b34d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2f8fc785-9fca-446b-99b7-2b2c1b39f2e1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2bac0237-471a-4711-8b5e-32bfaed79f02" xlink:to="loc_srt_MaximumMember_2f8fc785-9fca-446b-99b7-2b2c1b39f2e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_d9b790fc-c072-4fb2-93b6-8882461e8cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_VariableRateAxis_d9b790fc-c072-4fb2-93b6-8882461e8cd7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d9b790fc-c072-4fb2-93b6-8882461e8cd7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_d9b790fc-c072-4fb2-93b6-8882461e8cd7" xlink:to="loc_us-gaap_VariableRateDomain_d9b790fc-c072-4fb2-93b6-8882461e8cd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f2d9b555-e74b-4f45-b812-5f7fa221948d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_d9b790fc-c072-4fb2-93b6-8882461e8cd7" xlink:to="loc_us-gaap_VariableRateDomain_f2d9b555-e74b-4f45-b812-5f7fa221948d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_015a4a46-ed76-4459-bd29-3a5d49b3c995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_f2d9b555-e74b-4f45-b812-5f7fa221948d" xlink:to="loc_us-gaap_BaseRateMember_015a4a46-ed76-4459-bd29-3a5d49b3c995" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_TermSOFRAndCORRAMember_26d82e8a-9358-4d36-9dbc-5dfd0bd9a579" xlink:href="apog-20251129.xsd#apog_TermSOFRAndCORRAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_f2d9b555-e74b-4f45-b812-5f7fa221948d" xlink:to="loc_apog_TermSOFRAndCORRAMember_26d82e8a-9358-4d36-9dbc-5dfd0bd9a579" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_IncrementalTermSOFRAndCORRAAdjustmentMember_9a1411da-7354-4352-b880-d0181aa7ae2f" xlink:href="apog-20251129.xsd#apog_IncrementalTermSOFRAndCORRAAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_f2d9b555-e74b-4f45-b812-5f7fa221948d" xlink:to="loc_apog_IncrementalTermSOFRAndCORRAAdjustmentMember_9a1411da-7354-4352-b880-d0181aa7ae2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_e2d364cd-fba0-4c67-abe0-8e923b175d7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aa038ee0-2999-4a2f-9999-719052be459c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_e2d364cd-fba0-4c67-abe0-8e923b175d7d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e2d364cd-fba0-4c67-abe0-8e923b175d7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e2d364cd-fba0-4c67-abe0-8e923b175d7d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e2d364cd-fba0-4c67-abe0-8e923b175d7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_536e54d2-deab-4cf5-8799-59e918cd6b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e2d364cd-fba0-4c67-abe0-8e923b175d7d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_536e54d2-deab-4cf5-8799-59e918cd6b2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_3f4b3b18-e4ec-4b6a-9a9b-4889d2490b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_536e54d2-deab-4cf5-8799-59e918cd6b2f" xlink:to="loc_us-gaap_InterestRateSwapMember_3f4b3b18-e4ec-4b6a-9a9b-4889d2490b2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6ffd7056-7e89-4522-9999-8a1b41fe76b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6ffd7056-7e89-4522-9999-8a1b41fe76b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_2ce52ca5-2f65-4d2a-a771-5a2a93abc59b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_DebtInstrumentTerm_2ce52ca5-2f65-4d2a-a771-5a2a93abc59b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_NumberOfDrawdowns_f1c98d20-4f44-4189-8da2-e234dac520de" xlink:href="apog-20251129.xsd#apog_NumberOfDrawdowns"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_NumberOfDrawdowns_f1c98d20-4f44-4189-8da2-e234dac520de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_NumberOfLinesOfCredit_67bfca47-fe68-47bc-914f-258e81516ba3" xlink:href="apog-20251129.xsd#apog_NumberOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_NumberOfLinesOfCredit_67bfca47-fe68-47bc-914f-258e81516ba3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_8e0808e8-ad0d-41db-a91c-5574889fc22c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_8e0808e8-ad0d-41db-a91c-5574889fc22c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_0678d1fe-feb5-4cc0-a9f6-9ee2b31937f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_InterestCostsCapitalized_0678d1fe-feb5-4cc0-a9f6-9ee2b31937f8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtInstrumentCovenantNetDebtToEBITDARatioMaximum_11d22266-9559-450b-b9d3-6ddd5523f372" xlink:href="apog-20251129.xsd#apog_DebtInstrumentCovenantNetDebtToEBITDARatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_DebtInstrumentCovenantNetDebtToEBITDARatioMaximum_11d22266-9559-450b-b9d3-6ddd5523f372" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtInstrumentCovenantEBITDAToInterestExpenseRatioMinimum_6c2c4015-d8d3-4be2-9431-720f602f28da" xlink:href="apog-20251129.xsd#apog_DebtInstrumentCovenantEBITDAToInterestExpenseRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_DebtInstrumentCovenantEBITDAToInterestExpenseRatioMinimum_6c2c4015-d8d3-4be2-9431-720f602f28da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DebtInstrumentCovenantAcquisitionHoliday_d7758fed-bfd1-44c9-95d5-f5dade66c2dc" xlink:href="apog-20251129.xsd#apog_DebtInstrumentCovenantAcquisitionHoliday"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_DebtInstrumentCovenantAcquisitionHoliday_d7758fed-bfd1-44c9-95d5-f5dade66c2dc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_MaximumNumberOfAcquisitionHolidays_19a92ae7-4246-46a9-99ff-1757672c5070" xlink:href="apog-20251129.xsd#apog_MaximumNumberOfAcquisitionHolidays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_MaximumNumberOfAcquisitionHolidays_19a92ae7-4246-46a9-99ff-1757672c5070" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_NumberOfQuartersSeparatingAcquisitionHolidays_8a3754c7-3af8-41a3-a0e0-1d9329dcb8e6" xlink:href="apog-20251129.xsd#apog_NumberOfQuartersSeparatingAcquisitionHolidays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_apog_NumberOfQuartersSeparatingAcquisitionHolidays_8a3754c7-3af8-41a3-a0e0-1d9329dcb8e6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a858aa60-0ce3-4fc2-9c7e-0dacbddf0aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a858aa60-0ce3-4fc2-9c7e-0dacbddf0aa9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromUnsecuredLinesOfCredit_62275c4b-abe0-4907-8f62-5a00663c9533" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromUnsecuredLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_ProceedsFromUnsecuredLinesOfCredit_62275c4b-abe0-4907-8f62-5a00663c9533" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_705ad8af-7c98-4757-9d3b-f613ff384a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_LineOfCredit_705ad8af-7c98-4757-9d3b-f613ff384a2d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_f7e07b8b-7e7c-471c-a654-97cae28de5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_f7e07b8b-7e7c-471c-a654-97cae28de5a2" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7b69bf05-943e-4166-85d8-272672292497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7b69bf05-943e-4166-85d8-272672292497" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaid_6ad79124-520d-40ac-a211-4ae12669d96c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_InterestPaid_6ad79124-520d-40ac-a211-4ae12669d96c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_b9b303e2-5b76-420b-b914-28486c631114" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4309e9d8-0347-4c43-99c6-9c7e47abc96c" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_b9b303e2-5b76-420b-b914-28486c631114" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/ShareholdersEquityDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#ShareholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/ShareholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_13891a5f-a6bf-42ef-9813-39387736953f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_13891a5f-a6bf-42ef-9813-39387736953f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_517ee430-b13a-4f10-a948-77d7db291ab7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_13891a5f-a6bf-42ef-9813-39387736953f" xlink:to="loc_srt_ShareRepurchaseProgramAxis_517ee430-b13a-4f10-a948-77d7db291ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_517ee430-b13a-4f10-a948-77d7db291ab7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_517ee430-b13a-4f10-a948-77d7db291ab7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_517ee430-b13a-4f10-a948-77d7db291ab7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_e8f7307f-e042-4d0e-8dff-27f19406cc9f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_517ee430-b13a-4f10-a948-77d7db291ab7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_e8f7307f-e042-4d0e-8dff-27f19406cc9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ShareRepurchaseProgramMember_93582e38-704d-4871-9c83-9f8b2dd6a312" xlink:href="apog-20251129.xsd#apog_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_e8f7307f-e042-4d0e-8dff-27f19406cc9f" xlink:to="loc_apog_ShareRepurchaseProgramMember_93582e38-704d-4871-9c83-9f8b2dd6a312" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_f1c7e760-9914-4b72-a33f-8471a026cf67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_f1c7e760-9914-4b72-a33f-8471a026cf67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_10dc3691-82eb-4303-a1e5-b7007bf87e10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_10dc3691-82eb-4303-a1e5-b7007bf87e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_50c6eeaf-4da1-42d4-b36a-c9a72e2eb7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_50c6eeaf-4da1-42d4-b36a-c9a72e2eb7ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_cfb346aa-fb30-4ca1-8797-3f418678f658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_cfb346aa-fb30-4ca1-8797-3f418678f658" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_9fc4a73b-bab2-4d24-95d1-19b526be4ad3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b27b9332-6c03-4b79-8025-264362a7a052" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_9fc4a73b-bab2-4d24-95d1-19b526be4ad3" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/ShareBasedCompensationScheduleofStockBasedCompensationAwardsGrantedandWeightedAverageGrantDateFairValueDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#ShareBasedCompensationScheduleofStockBasedCompensationAwardsGrantedandWeightedAverageGrantDateFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/ShareBasedCompensationScheduleofStockBasedCompensationAwardsGrantedandWeightedAverageGrantDateFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5ea21826-a94e-4827-b9fb-b24ac0c0b224" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5ea21826-a94e-4827-b9fb-b24ac0c0b224" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a767fe9b-8f50-40fe-a982-74eadf3f1670" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5ea21826-a94e-4827-b9fb-b24ac0c0b224" xlink:to="loc_us-gaap_AwardTypeAxis_a767fe9b-8f50-40fe-a982-74eadf3f1670" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a767fe9b-8f50-40fe-a982-74eadf3f1670_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_a767fe9b-8f50-40fe-a982-74eadf3f1670" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a767fe9b-8f50-40fe-a982-74eadf3f1670_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53bbf1f8-9d43-4354-809c-55ebc35e0810" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_a767fe9b-8f50-40fe-a982-74eadf3f1670" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53bbf1f8-9d43-4354-809c-55ebc35e0810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_d6fd32b8-c352-48c7-bb35-c9f35766ddda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53bbf1f8-9d43-4354-809c-55ebc35e0810" xlink:to="loc_us-gaap_RestrictedStockMember_d6fd32b8-c352-48c7-bb35-c9f35766ddda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_fb794ab3-7546-4679-b3f4-9bd0dd3fb143" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53bbf1f8-9d43-4354-809c-55ebc35e0810" xlink:to="loc_us-gaap_PerformanceSharesMember_fb794ab3-7546-4679-b3f4-9bd0dd3fb143" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5ea21826-a94e-4827-b9fb-b24ac0c0b224" xlink:to="loc_srt_RangeAxis_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb" xlink:to="loc_srt_RangeMember_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ebb82d12-f5b8-47dc-98c9-d34e50707465" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_aaa53b21-5c2e-4e21-90a1-6e5e1a31c5eb" xlink:to="loc_srt_RangeMember_ebb82d12-f5b8-47dc-98c9-d34e50707465" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c851133f-25ea-4f4c-af60-9376292954f9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ebb82d12-f5b8-47dc-98c9-d34e50707465" xlink:to="loc_srt_MinimumMember_c851133f-25ea-4f4c-af60-9376292954f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2e02c203-6417-429d-8a4c-37b5fe2366f7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ebb82d12-f5b8-47dc-98c9-d34e50707465" xlink:to="loc_srt_MaximumMember_2e02c203-6417-429d-8a4c-37b5fe2366f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_445f1159-41c1-404d-82ad-6b6229495f25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_445f1159-41c1-404d-82ad-6b6229495f25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2a4d69c4-5bfd-4152-b918-2a68290bb9dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2a4d69c4-5bfd-4152-b918-2a68290bb9dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_3b39cdf1-62c3-4e89-8a37-efa8d458d8ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_3b39cdf1-62c3-4e89-8a37-efa8d458d8ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_TargetNumberOfPerformanceShares_b8897979-1d68-45f2-9bff-9c42ca794d78" xlink:href="apog-20251129.xsd#apog_TargetNumberOfPerformanceShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f3c8f96-5ed7-4536-893c-597fd61b783e" xlink:to="loc_apog_TargetNumberOfPerformanceShares_b8897979-1d68-45f2-9bff-9c42ca794d78" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#ShareBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_26e33550-5e29-482d-9158-7b0d18189ed9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_26e33550-5e29-482d-9158-7b0d18189ed9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_26e33550-5e29-482d-9158-7b0d18189ed9" xlink:to="loc_us-gaap_AwardTypeAxis_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff64b2a1-1175-4322-9fa2-111bbb56b14e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_78ed6493-ca18-4f7d-9aaa-bd4e4a40b8e4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff64b2a1-1175-4322-9fa2-111bbb56b14e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_f8260d45-2f72-47c3-929e-f8673ba96475" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ff64b2a1-1175-4322-9fa2-111bbb56b14e" xlink:to="loc_us-gaap_RestrictedStockMember_f8260d45-2f72-47c3-929e-f8673ba96475" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_cd9e9fed-21c1-484e-aca4-548554c49521" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_ShareBasedCompensation_cd9e9fed-21c1-484e-aca4-548554c49521" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_019b8ed5-ed78-7e08-8f12-82dbb7f11412" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_019b8ed5-ed78-7e08-8f12-82dbb7f11412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_501a7ee5-d714-45c3-9caf-d1f7e861f40f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_501a7ee5-d714-45c3-9caf-d1f7e861f40f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_cc89ab8e-6c17-47f2-9d28-1a9eef6c7d11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_cc89ab8e-6c17-47f2-9d28-1a9eef6c7d11" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_c5cd7b3d-d5d1-4153-87db-3c45b27bc671" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_72cbddd5-8226-42df-a981-4c0a99a20d36" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_c5cd7b3d-d5d1-4153-87db-3c45b27bc671" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/BusinessSegmentDataScheduleofCertainSegmentDataDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#BusinessSegmentDataScheduleofCertainSegmentDataDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/BusinessSegmentDataScheduleofCertainSegmentDataDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2a81e77e-1040-4cbf-a392-497fce61ecc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2a81e77e-1040-4cbf-a392-497fce61ecc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2a81e77e-1040-4cbf-a392-497fce61ecc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2a81e77e-1040-4cbf-a392-497fce61ecc6" xlink:to="loc_us-gaap_SegmentDomain_2a81e77e-1040-4cbf-a392-497fce61ecc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2a81e77e-1040-4cbf-a392-497fce61ecc6" xlink:to="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalMetalsSegmentMember_f410b0f7-5e58-4309-9965-79ee59d92d88" xlink:href="apog-20251129.xsd#apog_ArchitecturalMetalsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:to="loc_apog_ArchitecturalMetalsSegmentMember_f410b0f7-5e58-4309-9965-79ee59d92d88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalServicesSegmentMember_b80aa0b6-a9bd-491f-8c0e-462f9c43da63" xlink:href="apog-20251129.xsd#apog_ArchitecturalServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:to="loc_apog_ArchitecturalServicesSegmentMember_b80aa0b6-a9bd-491f-8c0e-462f9c43da63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalGlassSegmentMember_83a9d77e-ecbe-4377-947d-d99fcf95acf0" xlink:href="apog-20251129.xsd#apog_ArchitecturalGlassSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:to="loc_apog_ArchitecturalGlassSegmentMember_83a9d77e-ecbe-4377-947d-d99fcf95acf0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_PerformanceSurfacesMember_140738ca-65f5-41a7-af0b-502c120b8b9b" xlink:href="apog-20251129.xsd#apog_PerformanceSurfacesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e2adb6c3-6de8-490d-ab1c-fc80ee3d6418" xlink:to="loc_apog_PerformanceSurfacesMember_140738ca-65f5-41a7-af0b-502c120b8b9b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:to="loc_srt_ConsolidationItemsAxis_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4" xlink:to="loc_srt_ConsolidationItemsDomain_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_777c5074-c5d2-4a65-8023-3baba0e80604" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_478ace46-92f6-4bf7-a6fa-c3031b4ce1f4" xlink:to="loc_srt_ConsolidationItemsDomain_777c5074-c5d2-4a65-8023-3baba0e80604" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_448ca5cd-060f-4ffb-a151-e58332a39782" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_777c5074-c5d2-4a65-8023-3baba0e80604" xlink:to="loc_us-gaap_IntersegmentEliminationMember_448ca5cd-060f-4ffb-a151-e58332a39782" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_289ad0bd-3342-48bd-9c03-fbb34e797d67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_777c5074-c5d2-4a65-8023-3baba0e80604" xlink:to="loc_us-gaap_OperatingSegmentsMember_289ad0bd-3342-48bd-9c03-fbb34e797d67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d0dbfc68-6c2d-43e3-a412-0f659a1e3602" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d0dbfc68-6c2d-43e3-a412-0f659a1e3602" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d0dbfc68-6c2d-43e3-a412-0f659a1e3602_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d0dbfc68-6c2d-43e3-a412-0f659a1e3602" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d0dbfc68-6c2d-43e3-a412-0f659a1e3602_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5ff4d889-0409-40ce-8a77-a9fd5d326e09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d0dbfc68-6c2d-43e3-a412-0f659a1e3602" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5ff4d889-0409-40ce-8a77-a9fd5d326e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_8fab0da4-efd0-464e-a676-ffa8b7863a41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5ff4d889-0409-40ce-8a77-a9fd5d326e09" xlink:to="loc_us-gaap_CostOfSalesMember_8fab0da4-efd0-464e-a676-ffa8b7863a41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_46d77104-7d81-4fed-8981-d3ba15064340" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5ff4d889-0409-40ce-8a77-a9fd5d326e09" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_46d77104-7d81-4fed-8981-d3ba15064340" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2e830272-d5ff-4289-a4b9-cdef9ea92766" xlink:to="loc_us-gaap_RestructuringPlanAxis_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9" xlink:to="loc_us-gaap_RestructuringPlanDomain_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_80c3345c-3d48-42d1-a966-a1bee037c67c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_cbc00c69-1cf9-4ed2-aa23-860ae86b8aa9" xlink:to="loc_us-gaap_RestructuringPlanDomain_80c3345c-3d48-42d1-a966-a1bee037c67c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ProjectFortifyMember_3011009b-28c4-49a6-8cf0-44476fd33ef3" xlink:href="apog-20251129.xsd#apog_ProjectFortifyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_80c3345c-3d48-42d1-a966-a1bee037c67c" xlink:to="loc_apog_ProjectFortifyMember_3011009b-28c4-49a6-8cf0-44476fd33ef3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0a5a3857-e661-476a-8620-1a2fb79552bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0a5a3857-e661-476a-8620-1a2fb79552bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_CostOfGoodsAndServicesSoldAdjusted_e6dc0959-5fa3-4959-8567-78da256418f7" xlink:href="apog-20251129.xsd#apog_CostOfGoodsAndServicesSoldAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_CostOfGoodsAndServicesSoldAdjusted_e6dc0959-5fa3-4959-8567-78da256418f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_SellingGeneralAndAdministrativeExpenseAdjusted_c6abe133-b815-4a8e-aa5e-ab03c31a2e3c" xlink:href="apog-20251129.xsd#apog_SellingGeneralAndAdministrativeExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_SellingGeneralAndAdministrativeExpenseAdjusted_c6abe133-b815-4a8e-aa5e-ab03c31a2e3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_OtherNonoperatingIncomeExpenseAdjusted_7e77d163-38db-4c6e-b0d9-ea3c0c800c43" xlink:href="apog-20251129.xsd#apog_OtherNonoperatingIncomeExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_OtherNonoperatingIncomeExpenseAdjusted_7e77d163-38db-4c6e-b0d9-ea3c0c800c43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_DepreciationDepletionAndAmortizationAdjusted_408b7c79-d800-4cd2-9f75-bdf1cc2815b9" xlink:href="apog-20251129.xsd#apog_DepreciationDepletionAndAmortizationAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_DepreciationDepletionAndAmortizationAdjusted_408b7c79-d800-4cd2-9f75-bdf1cc2815b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_EarningsBeforeInterestTaxDepreciationAndAmortizationAdjusted_49ef6e3a-861b-44d5-b2c6-0c40af85fe00" xlink:href="apog-20251129.xsd#apog_EarningsBeforeInterestTaxDepreciationAndAmortizationAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_EarningsBeforeInterestTaxDepreciationAndAmortizationAdjusted_49ef6e3a-861b-44d5-b2c6-0c40af85fe00" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_AcquisitionRestructuringAndImpairmentCosts_950bfd1a-5432-4e41-bd43-209938ad8c00" xlink:href="apog-20251129.xsd#apog_AcquisitionRestructuringAndImpairmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_AcquisitionRestructuringAndImpairmentCosts_950bfd1a-5432-4e41-bd43-209938ad8c00" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_SettlementOfNewMarketsTaxCreditTransaction_c056e531-be62-4658-a5a9-df3191271d5b" xlink:href="apog-20251129.xsd#apog_SettlementOfNewMarketsTaxCreditTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_2168aae0-9b17-43e8-b35c-715c82e65a48" xlink:to="loc_apog_SettlementOfNewMarketsTaxCreditTransaction_c056e531-be62-4658-a5a9-df3191271d5b" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/BusinessSegmentDataScheduleofAdjustedEBITDADetails" xlink:type="simple" xlink:href="apog-20251129.xsd#BusinessSegmentDataScheduleofAdjustedEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/BusinessSegmentDataScheduleofAdjustedEBITDADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_35aef653-8cd1-4ade-9e1c-e9dbcf36da18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_35aef653-8cd1-4ade-9e1c-e9dbcf36da18" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_35aef653-8cd1-4ade-9e1c-e9dbcf36da18" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6" xlink:to="loc_us-gaap_SegmentDomain_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5bd8c895-6990-474f-b776-5c11f5fc2783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_726e9b76-0be5-4587-9c2e-0aaf4f0b80c6" xlink:to="loc_us-gaap_SegmentDomain_5bd8c895-6990-474f-b776-5c11f5fc2783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ReportableSegmentMember_cbecbc35-c5a0-47b0-9948-3fde3c8e5648" xlink:href="apog-20251129.xsd#apog_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5bd8c895-6990-474f-b776-5c11f5fc2783" xlink:to="loc_apog_ReportableSegmentMember_cbecbc35-c5a0-47b0-9948-3fde3c8e5648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_EarningsBeforeInterestAndTaxAdjusted_db5e8c6c-0712-4d42-8728-da588ce26167" xlink:href="apog-20251129.xsd#apog_EarningsBeforeInterestAndTaxAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_apog_EarningsBeforeInterestAndTaxAdjusted_db5e8c6c-0712-4d42-8728-da588ce26167" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_CorporateAndOtherExpenses_bc361899-b525-419e-b708-2499a25d4d01" xlink:href="apog-20251129.xsd#apog_CorporateAndOtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_apog_CorporateAndOtherExpenses_bc361899-b525-419e-b708-2499a25d4d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_56e9f52e-563d-4c2c-b05f-110416e4f9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_56e9f52e-563d-4c2c-b05f-110416e4f9b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_e2e2fb09-8b69-44ae-aba1-c2746c900407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_RestructuringCosts_e2e2fb09-8b69-44ae-aba1-c2746c900407" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_cab846f1-7a32-4dc1-95f3-0d4720d0b6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_Depreciation_cab846f1-7a32-4dc1-95f3-0d4720d0b6b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncome_64b6ff50-3769-4484-ab6d-fa98d61394d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_OtherOperatingIncome_64b6ff50-3769-4484-ab6d-fa98d61394d9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_3f24a2fc-11ae-46fc-8d47-3e4ae649a211" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_InterestExpenseNonoperating_3f24a2fc-11ae-46fc-8d47-3e4ae649a211" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_f0005260-036d-4794-a76b-8d9e02bf1e2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_f0005260-036d-4794-a76b-8d9e02bf1e2a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c1636535-109b-4231-8797-63e0bc1ce1bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_60d20237-97fa-48de-8098-8dbff4744ea2" xlink:to="loc_us-gaap_NetIncomeLoss_c1636535-109b-4231-8797-63e0bc1ce1bb" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#AcquisitionsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15baa24d-48ae-4c98-99cb-aefe0ed660c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15baa24d-48ae-4c98-99cb-aefe0ed660c3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9e6f0626-3370-4e0a-af97-00460cb342ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15baa24d-48ae-4c98-99cb-aefe0ed660c3" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9e6f0626-3370-4e0a-af97-00460cb342ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9e6f0626-3370-4e0a-af97-00460cb342ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9e6f0626-3370-4e0a-af97-00460cb342ff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9e6f0626-3370-4e0a-af97-00460cb342ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d0b43fa-fad3-44e5-bec1-9a52556b3ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9e6f0626-3370-4e0a-af97-00460cb342ff" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d0b43fa-fad3-44e5-bec1-9a52556b3ce5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_UWIntercoLLCMember_075f1bfa-d2b2-4e18-a40f-4b01294316d0" xlink:href="apog-20251129.xsd#apog_UWIntercoLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d0b43fa-fad3-44e5-bec1-9a52556b3ce5" xlink:to="loc_apog_UWIntercoLLCMember_075f1bfa-d2b2-4e18-a40f-4b01294316d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_45bf5060-7f26-4c86-8da4-a323be8fc0f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15baa24d-48ae-4c98-99cb-aefe0ed660c3" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_45bf5060-7f26-4c86-8da4-a323be8fc0f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_45bf5060-7f26-4c86-8da4-a323be8fc0f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_45bf5060-7f26-4c86-8da4-a323be8fc0f5" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_45bf5060-7f26-4c86-8da4-a323be8fc0f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9b70f93a-4f8b-4342-8bee-e8d910f9139f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_45bf5060-7f26-4c86-8da4-a323be8fc0f5" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9b70f93a-4f8b-4342-8bee-e8d910f9139f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_deae865a-a967-4d32-b7fe-74d0967edde6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9b70f93a-4f8b-4342-8bee-e8d910f9139f" xlink:to="loc_us-gaap_CostOfSalesMember_deae865a-a967-4d32-b7fe-74d0967edde6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_b5cfff08-4bc5-4b21-a06a-ded8ef742a50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9b70f93a-4f8b-4342-8bee-e8d910f9139f" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_b5cfff08-4bc5-4b21-a06a-ded8ef742a50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_34eb1bc9-39e9-495a-a84d-210e93ef43e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_34eb1bc9-39e9-495a-a84d-210e93ef43e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_c354a1ca-4c8a-4a5f-b288-95337d7f1524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_c354a1ca-4c8a-4a5f-b288-95337d7f1524" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationNetWorkingCapitalAdjustment_704baf0d-b8ba-4c57-8fce-bca8d23dc7b1" xlink:href="apog-20251129.xsd#apog_BusinessCombinationNetWorkingCapitalAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_apog_BusinessCombinationNetWorkingCapitalAdjustment_704baf0d-b8ba-4c57-8fce-bca8d23dc7b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_490e89ba-80e9-464d-82bb-8fb57590cdc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_490e89ba-80e9-464d-82bb-8fb57590cdc2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_c9842c1d-3bd7-40da-9981-7ce59c2c62cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_c9842c1d-3bd7-40da-9981-7ce59c2c62cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_2eadb71c-2aa5-4293-b88d-805b3cc97e97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationIntegrationRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationIntegrationRelatedCosts_2eadb71c-2aa5-4293-b88d-805b3cc97e97" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_5421c904-caae-4bc7-bce0-1925ba888a95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_Goodwill_5421c904-caae-4bc7-bce0-1925ba888a95" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_542207a4-1741-4a10-a538-39237a4f65c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_542207a4-1741-4a10-a538-39237a4f65c7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_de0d99a4-8b1e-4bb7-abcc-8f110ca2919d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_de0d99a4-8b1e-4bb7-abcc-8f110ca2919d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationNonRecurringChargesIntegrationCosts_019b4c0d-ff69-70d6-98f4-a2ee227417aa" xlink:href="apog-20251129.xsd#apog_BusinessCombinationNonRecurringChargesIntegrationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_apog_BusinessCombinationNonRecurringChargesIntegrationCosts_019b4c0d-ff69-70d6-98f4-a2ee227417aa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_019b8ede-c84c-78d2-aad3-e11d395006a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed_019b8ede-c84c-78d2-aad3-e11d395006a6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationNonRecurringChargesAmortizationOfAcquiredBacklog_019b4c0d-ff69-7038-9367-ceac4fe2b4b2" xlink:href="apog-20251129.xsd#apog_BusinessCombinationNonRecurringChargesAmortizationOfAcquiredBacklog"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_apog_BusinessCombinationNonRecurringChargesAmortizationOfAcquiredBacklog_019b4c0d-ff69-7038-9367-ceac4fe2b4b2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationNonRecurringChargesInventoryStepUpExpense_019b4c0d-ff69-7a36-9684-ea01044f0d8c" xlink:href="apog-20251129.xsd#apog_BusinessCombinationNonRecurringChargesInventoryStepUpExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_bd468ffd-2f39-4be7-b7b9-048580f88a2e" xlink:to="loc_apog_BusinessCombinationNonRecurringChargesInventoryStepUpExpense_019b4c0d-ff69-7a36-9684-ea01044f0d8c" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/AcquisitionsScheduleofEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#AcquisitionsScheduleofEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/AcquisitionsScheduleofEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ef523577-1c34-4e09-b601-a6c1ee802046" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19369c99-2520-4689-b57f-734eade2af1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ef523577-1c34-4e09-b601-a6c1ee802046" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19369c99-2520-4689-b57f-734eade2af1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3a4a044b-d877-4c96-8822-dda6c13a1773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19369c99-2520-4689-b57f-734eade2af1b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3a4a044b-d877-4c96-8822-dda6c13a1773" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3a4a044b-d877-4c96-8822-dda6c13a1773_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3a4a044b-d877-4c96-8822-dda6c13a1773" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3a4a044b-d877-4c96-8822-dda6c13a1773_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2ea4ee8e-c728-4284-a68e-eafd8bda2d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3a4a044b-d877-4c96-8822-dda6c13a1773" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2ea4ee8e-c728-4284-a68e-eafd8bda2d1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_UWIntercoLLCMember_f2e94685-15d2-4ddb-87fa-8f1dee94e119" xlink:href="apog-20251129.xsd#apog_UWIntercoLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2ea4ee8e-c728-4284-a68e-eafd8bda2d1a" xlink:to="loc_apog_UWIntercoLLCMember_f2e94685-15d2-4ddb-87fa-8f1dee94e119" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ef523577-1c34-4e09-b601-a6c1ee802046" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_2005d329-97b7-47ed-9a91-f6adedf9c6bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_2005d329-97b7-47ed-9a91-f6adedf9c6bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_a21599a5-cf4b-464f-9058-b4902020b7be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_a21599a5-cf4b-464f-9058-b4902020b7be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6f162999-2612-4e37-914d-c4a272a89072" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6f162999-2612-4e37-914d-c4a272a89072" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_6cfe2845-68a4-43d7-a1f4-a232d4d4e931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_6cfe2845-68a4-43d7-a1f4-a232d4d4e931" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_893d039a-395a-4d6b-8f4a-58f56c7e979e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_893d039a-395a-4d6b-8f4a-58f56c7e979e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets_6e00e814-9c90-4300-b535-88ac74c946b2" xlink:href="apog-20251129.xsd#apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets_6e00e814-9c90-4300-b535-88ac74c946b2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_c137d67a-aa6d-4865-981e-d86696446201" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_Goodwill_c137d67a-aa6d-4865-981e-d86696446201" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_ebda7f72-62f8-4eb3-b0e4-cb2108ac76f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_ebda7f72-62f8-4eb3-b0e4-cb2108ac76f5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_e487f209-7f7c-453b-8c52-f8936d4cbb83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_e487f209-7f7c-453b-8c52-f8936d4cbb83" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_a82dfdc0-3f59-4d49-8795-6f9fdc244b5d" xlink:href="apog-20251129.xsd#apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_0c62a626-999f-4aad-8e21-5484849def4d" xlink:to="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_a82dfdc0-3f59-4d49-8795-6f9fdc244b5d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ef523577-1c34-4e09-b601-a6c1ee802046" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1de5d7d1-2636-4d85-94dc-f18a2d324830" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1de5d7d1-2636-4d85-94dc-f18a2d324830" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedCompensationAndBenefits_f1f93422-e45e-4de8-917c-3a19c9ec7d16" xlink:href="apog-20251129.xsd#apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedCompensationAndBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedCompensationAndBenefits_f1f93422-e45e-4de8-917c-3a19c9ec7d16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesCurrent_10fd6cbf-567b-4960-b92a-50ce340d323d" xlink:href="apog-20251129.xsd#apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesCurrent_10fd6cbf-567b-4960-b92a-50ce340d323d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_4d880602-9407-4814-ac3b-30467f9c6389" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_4d880602-9407-4814-ac3b-30467f9c6389" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesNoncurrent_2d92b6b3-1fd7-42d4-94de-6937dc0f1d45" xlink:href="apog-20251129.xsd#apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_apog_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesNoncurrent_2d92b6b3-1fd7-42d4-94de-6937dc0f1d45" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_20300392-33e5-4e51-85d3-1c39b5ec13dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_fff39f3a-f15d-47e7-94d0-807d45779032" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_20300392-33e5-4e51-85d3-1c39b5ec13dd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_295d0a82-900d-4ca1-812e-7ee75dbe643a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ef523577-1c34-4e09-b601-a6c1ee802046" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_295d0a82-900d-4ca1-812e-7ee75dbe643a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/AcquisitionsScheduleofSupplementalUnauditedProFormaInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#AcquisitionsScheduleofSupplementalUnauditedProFormaInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/AcquisitionsScheduleofSupplementalUnauditedProFormaInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_2107b141-100b-4128-be62-fc457962dad5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c7c14b0d-3dc5-4d7a-b510-24f0d14a7f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2107b141-100b-4128-be62-fc457962dad5" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c7c14b0d-3dc5-4d7a-b510-24f0d14a7f2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_ab368d7e-32ee-47bf-8470-b940caa2e6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c7c14b0d-3dc5-4d7a-b510-24f0d14a7f2a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_ab368d7e-32ee-47bf-8470-b940caa2e6b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab368d7e-32ee-47bf-8470-b940caa2e6b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ab368d7e-32ee-47bf-8470-b940caa2e6b1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab368d7e-32ee-47bf-8470-b940caa2e6b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0da4614-1689-4f22-a3af-1e0502eba393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ab368d7e-32ee-47bf-8470-b940caa2e6b1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0da4614-1689-4f22-a3af-1e0502eba393" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_UWIntercoLLCMember_65339308-15e9-470b-87be-8fcb20d56807" xlink:href="apog-20251129.xsd#apog_UWIntercoLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0da4614-1689-4f22-a3af-1e0502eba393" xlink:to="loc_apog_UWIntercoLLCMember_65339308-15e9-470b-87be-8fcb20d56807" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_43319f50-2298-4bb0-8314-01a20839fb85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2107b141-100b-4128-be62-fc457962dad5" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_43319f50-2298-4bb0-8314-01a20839fb85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_fea9d413-9569-40e4-80cf-13075e4c95f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2107b141-100b-4128-be62-fc457962dad5" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_fea9d413-9569-40e4-80cf-13075e4c95f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_BusinessAcquisitionProFormaEarningsPerShareAbstract_f707704a-ec75-4c4c-b9aa-e3dad0df766a" xlink:href="apog-20251129.xsd#apog_BusinessAcquisitionProFormaEarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_2107b141-100b-4128-be62-fc457962dad5" xlink:to="loc_apog_BusinessAcquisitionProFormaEarningsPerShareAbstract_f707704a-ec75-4c4c-b9aa-e3dad0df766a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_a8272154-473a-4397-afd3-01946dbcea17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apog_BusinessAcquisitionProFormaEarningsPerShareAbstract_f707704a-ec75-4c4c-b9aa-e3dad0df766a" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_a8272154-473a-4397-afd3-01946dbcea17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_57a43d47-b416-409f-a7da-f945556db44e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_apog_BusinessAcquisitionProFormaEarningsPerShareAbstract_f707704a-ec75-4c4c-b9aa-e3dad0df766a" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_57a43d47-b416-409f-a7da-f945556db44e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RestructuringAdditionalInformationDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RestructuringAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RestructuringAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_cd2cccb0-8985-446c-b890-c615e4798f4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_cd2cccb0-8985-446c-b890-c615e4798f4e" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_19e7b1e7-071b-49c7-a8e3-cc201ea576db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_srt_RangeAxis_19e7b1e7-071b-49c7-a8e3-cc201ea576db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_19e7b1e7-071b-49c7-a8e3-cc201ea576db_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_19e7b1e7-071b-49c7-a8e3-cc201ea576db" xlink:to="loc_srt_RangeMember_19e7b1e7-071b-49c7-a8e3-cc201ea576db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_450d76b6-6d25-492b-9cd2-dd8a7e6e33c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_19e7b1e7-071b-49c7-a8e3-cc201ea576db" xlink:to="loc_srt_RangeMember_450d76b6-6d25-492b-9cd2-dd8a7e6e33c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c61b089b-617b-4bcd-ae06-5f2208336b6d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_450d76b6-6d25-492b-9cd2-dd8a7e6e33c7" xlink:to="loc_srt_MinimumMember_c61b089b-617b-4bcd-ae06-5f2208336b6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d133a2a5-bb9c-42a1-8069-8ce09e4ea3f9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_450d76b6-6d25-492b-9cd2-dd8a7e6e33c7" xlink:to="loc_srt_MaximumMember_d133a2a5-bb9c-42a1-8069-8ce09e4ea3f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_65749a55-c862-4981-a2e3-73216badc13e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_us-gaap_RestructuringPlanAxis_65749a55-c862-4981-a2e3-73216badc13e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_65749a55-c862-4981-a2e3-73216badc13e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_65749a55-c862-4981-a2e3-73216badc13e" xlink:to="loc_us-gaap_RestructuringPlanDomain_65749a55-c862-4981-a2e3-73216badc13e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_430a82f0-7ed3-4aeb-a223-4a41bda49b6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_65749a55-c862-4981-a2e3-73216badc13e" xlink:to="loc_us-gaap_RestructuringPlanDomain_430a82f0-7ed3-4aeb-a223-4a41bda49b6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ProjectFortifyMember_69fc7c77-280a-4b4d-b48d-67e7890ad72f" xlink:href="apog-20251129.xsd#apog_ProjectFortifyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_430a82f0-7ed3-4aeb-a223-4a41bda49b6e" xlink:to="loc_apog_ProjectFortifyMember_69fc7c77-280a-4b4d-b48d-67e7890ad72f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_c30b92fb-dcc5-4c93-b089-d2fdfba01277" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_c30b92fb-dcc5-4c93-b089-d2fdfba01277" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_c30b92fb-dcc5-4c93-b089-d2fdfba01277_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_c30b92fb-dcc5-4c93-b089-d2fdfba01277" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_c30b92fb-dcc5-4c93-b089-d2fdfba01277_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_2fa10841-0170-4dfa-b6c1-a8501430e39b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_c30b92fb-dcc5-4c93-b089-d2fdfba01277" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_2fa10841-0170-4dfa-b6c1-a8501430e39b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_18e3070c-8cbd-4d13-b226-329aed86f41b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_2fa10841-0170-4dfa-b6c1-a8501430e39b" xlink:to="loc_us-gaap_EmployeeSeveranceMember_18e3070c-8cbd-4d13-b226-329aed86f41b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractTerminationMember_c95a8319-6cc4-4978-816c-575328e05c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractTerminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_2fa10841-0170-4dfa-b6c1-a8501430e39b" xlink:to="loc_us-gaap_ContractTerminationMember_c95a8319-6cc4-4978-816c-575328e05c4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_187a6cca-e79a-4d4a-86af-f2683b3cdbe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_2fa10841-0170-4dfa-b6c1-a8501430e39b" xlink:to="loc_us-gaap_OtherRestructuringMember_187a6cca-e79a-4d4a-86af-f2683b3cdbe1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_0c7b1658-4915-4d60-b6ad-44d502e01ae8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_srt_StatementScenarioAxis_0c7b1658-4915-4d60-b6ad-44d502e01ae8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_0c7b1658-4915-4d60-b6ad-44d502e01ae8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_0c7b1658-4915-4d60-b6ad-44d502e01ae8" xlink:to="loc_srt_ScenarioUnspecifiedDomain_0c7b1658-4915-4d60-b6ad-44d502e01ae8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_4fc086ad-0a9f-4011-85c7-eb515baf8025" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_0c7b1658-4915-4d60-b6ad-44d502e01ae8" xlink:to="loc_srt_ScenarioUnspecifiedDomain_4fc086ad-0a9f-4011-85c7-eb515baf8025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_9418d793-fbc0-4559-a1ee-2ddc2e326447" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_4fc086ad-0a9f-4011-85c7-eb515baf8025" xlink:to="loc_srt_ScenarioForecastMember_9418d793-fbc0-4559-a1ee-2ddc2e326447" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_95729fc6-eecc-4801-9acd-2e0a571a2d47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_95729fc6-eecc-4801-9acd-2e0a571a2d47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_95729fc6-eecc-4801-9acd-2e0a571a2d47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_95729fc6-eecc-4801-9acd-2e0a571a2d47" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_95729fc6-eecc-4801-9acd-2e0a571a2d47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c87453ce-ffd2-4b5d-9524-f8a77eb53390" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_95729fc6-eecc-4801-9acd-2e0a571a2d47" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c87453ce-ffd2-4b5d-9524-f8a77eb53390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_147ddf18-985c-4b91-a2ab-89a35ac5b2d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c87453ce-ffd2-4b5d-9524-f8a77eb53390" xlink:to="loc_us-gaap_CostOfSalesMember_147ddf18-985c-4b91-a2ab-89a35ac5b2d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_decf80ed-69ba-4bf8-b0aa-66647629d118" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c87453ce-ffd2-4b5d-9524-f8a77eb53390" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_decf80ed-69ba-4bf8-b0aa-66647629d118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_38aba4c3-3b0a-478a-8e19-4ffa72f75939" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_47aad091-7d88-4322-8dfe-d11794673a26" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_38aba4c3-3b0a-478a-8e19-4ffa72f75939" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_38aba4c3-3b0a-478a-8e19-4ffa72f75939_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_38aba4c3-3b0a-478a-8e19-4ffa72f75939" xlink:to="loc_us-gaap_SegmentDomain_38aba4c3-3b0a-478a-8e19-4ffa72f75939_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ec9d644f-2dfb-4583-b111-5fba90fe3c64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_38aba4c3-3b0a-478a-8e19-4ffa72f75939" xlink:to="loc_us-gaap_SegmentDomain_ec9d644f-2dfb-4583-b111-5fba90fe3c64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalServicesSegmentMember_d2bd1b30-ab6d-485c-8a0c-7ce696f4e1a7" xlink:href="apog-20251129.xsd#apog_ArchitecturalServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ec9d644f-2dfb-4583-b111-5fba90fe3c64" xlink:to="loc_apog_ArchitecturalServicesSegmentMember_d2bd1b30-ab6d-485c-8a0c-7ce696f4e1a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_887c63a0-5ab2-43cf-b8a3-f0da0da6264d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ec9d644f-2dfb-4583-b111-5fba90fe3c64" xlink:to="loc_us-gaap_CorporateAndOtherMember_887c63a0-5ab2-43cf-b8a3-f0da0da6264d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_e728bd7a-41a2-412a-aaa4-a39dc19826e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_cd2cccb0-8985-446c-b890-c615e4798f4e" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_e728bd7a-41a2-412a-aaa4-a39dc19826e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_b5201cc4-c5e7-411e-900f-027bc98af499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_cd2cccb0-8985-446c-b890-c615e4798f4e" xlink:to="loc_us-gaap_RestructuringCosts_b5201cc4-c5e7-411e-900f-027bc98af499" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_AcquisitionRestructuringAndImpairmentCosts_707e105d-5c9d-4351-bda1-d2dddfea2a1b" xlink:href="apog-20251129.xsd#apog_AcquisitionRestructuringAndImpairmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_cd2cccb0-8985-446c-b890-c615e4798f4e" xlink:to="loc_apog_AcquisitionRestructuringAndImpairmentCosts_707e105d-5c9d-4351-bda1-d2dddfea2a1b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RestructuringScheduleofRestructuringCostsDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RestructuringScheduleofRestructuringCostsDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RestructuringScheduleofRestructuringCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_3575cc85-01a4-404c-b7dc-46c8c4e5f4fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b2b9ba64-1a06-4c03-b9d8-83e897587d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3575cc85-01a4-404c-b7dc-46c8c4e5f4fc" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b2b9ba64-1a06-4c03-b9d8-83e897587d8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1bd37715-28e6-44b3-8f2e-dbe6d33010a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b2b9ba64-1a06-4c03-b9d8-83e897587d8d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1bd37715-28e6-44b3-8f2e-dbe6d33010a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1bd37715-28e6-44b3-8f2e-dbe6d33010a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1bd37715-28e6-44b3-8f2e-dbe6d33010a1" xlink:to="loc_us-gaap_SegmentDomain_1bd37715-28e6-44b3-8f2e-dbe6d33010a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_333d527a-8b30-4a99-8d24-d048bbb64b03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1bd37715-28e6-44b3-8f2e-dbe6d33010a1" xlink:to="loc_us-gaap_SegmentDomain_333d527a-8b30-4a99-8d24-d048bbb64b03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalFramingSegmentMember_1736f3bd-f4fa-4388-b5c6-d333340f4aae" xlink:href="apog-20251129.xsd#apog_ArchitecturalFramingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_333d527a-8b30-4a99-8d24-d048bbb64b03" xlink:to="loc_apog_ArchitecturalFramingSegmentMember_1736f3bd-f4fa-4388-b5c6-d333340f4aae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalServicesSegmentMember_17ebdf3b-fef3-4fad-b381-ee9151b6a25d" xlink:href="apog-20251129.xsd#apog_ArchitecturalServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_333d527a-8b30-4a99-8d24-d048bbb64b03" xlink:to="loc_apog_ArchitecturalServicesSegmentMember_17ebdf3b-fef3-4fad-b381-ee9151b6a25d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_76005a48-253f-4706-8830-b562f4f0847c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_333d527a-8b30-4a99-8d24-d048bbb64b03" xlink:to="loc_us-gaap_CorporateAndOtherMember_76005a48-253f-4706-8830-b562f4f0847c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_17bfc0ab-49bd-4007-b3d0-9e80876d333c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b2b9ba64-1a06-4c03-b9d8-83e897587d8d" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_17bfc0ab-49bd-4007-b3d0-9e80876d333c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_17bfc0ab-49bd-4007-b3d0-9e80876d333c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_17bfc0ab-49bd-4007-b3d0-9e80876d333c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_17bfc0ab-49bd-4007-b3d0-9e80876d333c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8fe99f56-53ea-4ad3-b9a4-f85459966349" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_17bfc0ab-49bd-4007-b3d0-9e80876d333c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8fe99f56-53ea-4ad3-b9a4-f85459966349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_0a601308-8568-41f0-a442-491643b23c38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8fe99f56-53ea-4ad3-b9a4-f85459966349" xlink:to="loc_us-gaap_EmployeeSeveranceMember_0a601308-8568-41f0-a442-491643b23c38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractTerminationMember_753059ae-5821-4cd7-9b1d-3d06706a8522" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractTerminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8fe99f56-53ea-4ad3-b9a4-f85459966349" xlink:to="loc_us-gaap_ContractTerminationMember_753059ae-5821-4cd7-9b1d-3d06706a8522" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_828ad8dc-91a4-41ae-8b32-5c6fb1c68619" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8fe99f56-53ea-4ad3-b9a4-f85459966349" xlink:to="loc_us-gaap_OtherRestructuringMember_828ad8dc-91a4-41ae-8b32-5c6fb1c68619" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_fc02eea4-15d7-4cf0-849b-aa6981c1a4b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3575cc85-01a4-404c-b7dc-46c8c4e5f4fc" xlink:to="loc_us-gaap_RestructuringCosts_fc02eea4-15d7-4cf0-849b-aa6981c1a4b2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.apog.com/role/RestructuringScheduleofReserveDetails" xlink:type="simple" xlink:href="apog-20251129.xsd#RestructuringScheduleofReserveDetails"/>
  <link:definitionLink xlink:role="http://www.apog.com/role/RestructuringScheduleofReserveDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_a5637549-ee03-41dd-b16a-42cdc59c6363" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6ba973e4-37d2-443d-98f5-0f84cf140907" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_a5637549-ee03-41dd-b16a-42cdc59c6363" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6ba973e4-37d2-443d-98f5-0f84cf140907" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_e134a1b2-9f8d-4d17-8934-3505f9310555" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6ba973e4-37d2-443d-98f5-0f84cf140907" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_e134a1b2-9f8d-4d17-8934-3505f9310555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e134a1b2-9f8d-4d17-8934-3505f9310555_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e134a1b2-9f8d-4d17-8934-3505f9310555" xlink:to="loc_us-gaap_SegmentDomain_e134a1b2-9f8d-4d17-8934-3505f9310555_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_922b7e36-374d-419c-908a-8efc17264e0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e134a1b2-9f8d-4d17-8934-3505f9310555" xlink:to="loc_us-gaap_SegmentDomain_922b7e36-374d-419c-908a-8efc17264e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalFramingSegmentMember_b305067f-c40a-4821-a5f8-1e1f2876789d" xlink:href="apog-20251129.xsd#apog_ArchitecturalFramingSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_922b7e36-374d-419c-908a-8efc17264e0b" xlink:to="loc_apog_ArchitecturalFramingSegmentMember_b305067f-c40a-4821-a5f8-1e1f2876789d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_apog_ArchitecturalServicesSegmentMember_a489acd1-f537-4c16-a400-6d10e90b998b" xlink:href="apog-20251129.xsd#apog_ArchitecturalServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_922b7e36-374d-419c-908a-8efc17264e0b" xlink:to="loc_apog_ArchitecturalServicesSegmentMember_a489acd1-f537-4c16-a400-6d10e90b998b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_7685e9ea-37c8-4759-948c-66ba814287e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_922b7e36-374d-419c-908a-8efc17264e0b" xlink:to="loc_us-gaap_CorporateAndOtherMember_7685e9ea-37c8-4759-948c-66ba814287e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019b0512-2f5d-72e0-ba72-c20881ff628c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_a5637549-ee03-41dd-b16a-42cdc59c6363" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019b0512-2f5d-72e0-ba72-c20881ff628c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_306fde5c-c95f-46cc-b78e-db36d28fcf4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019b0512-2f5d-72e0-ba72-c20881ff628c" xlink:to="loc_us-gaap_RestructuringReserve_306fde5c-c95f-46cc-b78e-db36d28fcf4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_730cfd5f-9ad7-4dbe-aaac-f7963388e83f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019b0512-2f5d-72e0-ba72-c20881ff628c" xlink:to="loc_us-gaap_RestructuringCharges_730cfd5f-9ad7-4dbe-aaac-f7963388e83f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_a4f01a34-6b41-401d-a98f-51ce4cfd7ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019b0512-2f5d-72e0-ba72-c20881ff628c" xlink:to="loc_us-gaap_PaymentsForRestructuring_a4f01a34-6b41-401d-a98f-51ce4cfd7ec4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_740f0299-ffb7-4e87-87c7-87dc4ac6919c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
</link:linkbase>
