Definition of activist noun from the Oxford Advanced Learner's Dictionary

 

activist

 noun
noun
BrE BrE//ˈæktɪvɪst//
 
; NAmE NAmE//ˈæktɪvɪst//
 
 
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a person who works to achieve political or social change, especially as a member of an organization with particular aims gay activists Gay activists marched in London today to protest against the new law. The Prime Minister will face party activists when he addresses the Welsh Labour Conference tomorrow.
See the Oxford Advanced American Dictionary entry: activist