Entry 1 sense Webster, 1913 Disinheritance · Dis·in·her·it·ance · IPA /ˌdɪsɪnˈhɛrɪtən(t)s/ 01 n. The act of disinheriting, or the condition of being; disinherited; disherison. 1. The act of disinheriting, or the condition of being; disinherited; disherison.