colonialist /kəˈloʊ.ni.ə.lɪst/adjective 1noun 1forms 3 adjective1 •Of or pertaining to colonialism.Outlines of a systemic relation between society and ecology are evident with the theoretical innovations underlying the ecoimperialist and colonialist critiques. — 2017 noun1 •One who supports or advocates colonialism.[Marc Jacobs] is a colonialist, an extender of brands, and in very good shape. — 2010 formscolonialists · more colonialist · most colonialist