Entry 1 sense Webster, 1913 Applicability /ăpˌ-lək-əb-ĭl'-ət-ē/ · Ap·pli·ca·bil·i·ty · IPA /ˌæpləkəbˈɪlətiː/ 01 n. The quality of being applicable or fit to be applied. 1. The quality of being applicable or fit to be applied.