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English definition of “activist”

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activist

noun [C] uk   /ˈæk.tɪ.vɪst/ us  
a person who believes strongly in political or social change and takes part in activities such as public protests to try to make this happen: He's been a trade union/party activist for many years. an animal rights activist
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(Definition of activist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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