Entry 1 sense Webster, 1913 Malleability /mălˌ-ē-əb-ĭl'-ət-ē/ · Mal·le·a·bil·i·ty · IPA /mˌæliːəbˈɪlətiː/ 01 n. The quality or state of being malleable; -- opposed to friability and brittleness. 1. The quality or state of being malleable; -- opposed to friability and brittleness.