Definition of colonialism noun from the Oxford Advanced American Dictionary

 

colonialism

 noun
noun
NAmE//kəˈloʊniəˌlɪzəm//
 
[uncountable]
 
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the practice by which a powerful country controls another country or other countries European colonialism The history of tobacco growing is intimately associated with colonialism and slavery.
colonialist
 
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adjective, noun colonialist laws The colonialists imposed war on the country.
See the Oxford Advanced Learner's Dictionary entry: colonialism