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English definition of “campaigner”

campaigner

noun [C] uk   /ˌkæmˈpeɪ.nər/ us    /-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 Learners Dictionary & Thesaurus © Cambridge University Press)
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