Meaning of “activist” in the English Dictionary

british dictionary

"activist" in British English

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activistnoun [ C ]

uk /ˈæk.tɪ.vɪst/ us /ˈæk.tə.vɪst/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)