colonialism Syllabification: (co·lo·ni·al·ism)Pronunciation: /kəˈlōnēəˌlizəm, kəˈlōnyəˌlizəm/Definition of colonialism noun the policy or practice of acquiring full or partial political control over another country, occupying it with settlers, and exploiting it economically. Derivatives colonialistPronunciation: /-list/ noun & adjective colonialism in other Oxford dictionaries Definition of colonialism in the British & World English dictionary