Entry 1 sense Webster, 1913 Flammability /flămˌ-əb-ĭl'-ĭt-ē/ · Flam·ma·bil·ity · IPA /flˌæməbˈɪlɪtiː/ 01 n. The quality of being flammable; inflammability. 1. The quality of being flammable; inflammability.[Obs.]