Entry 1 sense Webster, 1913 Habituation /(hȧ*bĭt"ū̇*ā"shŭn)/ · Ha·bit·u·a·tion · IPA /həˌbɪt.juˈeɪ.ʃən/ 01 n. The act of habituating, or accustoming; the state of being habituated. 1. The act of habituating, or accustoming; the state of being habituated.