Entry 1 sense Webster, 1913 Adaptability /əd-ăpˌ-təb-ĭl'-ət-ē/ · A·dapt·a·bil·i·ty · IPA /əˌdæptəˈbɪləti/ 01 n. The quality of being adaptable; suitableness. 1. The quality of being adaptable; suitableness.