Definition of activist noun from the Oxford Advanced American Dictionary

  

activist

 noun
noun
NAmE//ˈæktəvɪst//
 
 
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a person who works to achieve political or social change, especially as a member of an organization with particular aims animal rights activists
NAmE//ˈæktəˌvɪzəm//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: activist