Entry 1 sense Webster, 1913 Abolitionism /ăbˌ-əl-ĭsh'-ən-ĭzˌ-əm/ · Ab·o·li·tion·ism · IPA /ˌæb.əˈlɪʃ.əˌnɪz.m̩/ 01 n. The principles or measures of abolitionists. 1. The principles or measures of abolitionists.