Meaning of “campaigner” in the English Dictionary

british dictionary

"campaigner" in British English

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campaignernoun [ C ]

uk /ˌkæmˈpeɪ.nər/ us /ˌkæmˈpeɪ.nɚ/

a person who takes part in organized activities that are intended to change something in society:

an animal rights campaigner
She's a campaigner for Friends of the Earth.

(Definition of “campaigner” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)