From Longman Dictionary of Contemporary Englishcolonialistco‧lo‧ni‧al‧ist /kəˈləʊniəlɪst $ -ˈloʊ-/ noun [countable] PPPa supporter of colonialism —colonialist adjective colonialist attitudesFrom Longman Business Dictionarycolonialistco‧lo‧ni‧al‧ist1 /kəˈləʊniələst-ˈloʊ-/ noun [countable]ECONOMICS someone who supports colonialism or who is part of a colonialist systemThe region was neglected by the colonialists.colonialistcolonialist2 adjective [only before a noun]ECONOMICS relating to colonialismold-fashioned colonialist ideas