Definition of campaigner noun from the Oxford Advanced American Dictionary

 

campaigner

 noun
noun
NAmE//kæmˈpeɪnər//
 
 
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a person who leads or takes part in a campaign, especially one for political or social change a leading human rights campaigner a campaigner on environmental issues a campaigner for women priests an old/veteran/seasoned campaigner (= a person with a lot of experience of a particular activity) Obama campaigners (= people working for Obama in a campaign)
See the Oxford Advanced Learner's Dictionary entry: campaigner