Entry 1 sense Webster, 1913 Populism /päp'-yəl-ĭzˌ-əm/ · Pop·u·lism · IPA /pˈɑpjəlˌɪzəm/ 01 n. The political doctrines advocated by the People's party. 1. The political doctrines advocated by the People's party.(U. S. Politics)