Entry 1 sense Webster, 1913 Darwinism /där'-wĭn-ĭzˌ-əm/ · Dar·win·ism · IPA /ˈdɑɹwənˌɪzəm/ 01 n. The theory or doctrines put forth by Darwin. See above. 1. The theory or doctrines put forth by Darwin. See above.(Biol.)