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Definition of environmentalist noun from the Oxford Advanced Learner's Dictionary

Academic

environmentalist

noun
environmentalist pronunciation English ɪnˌvaɪrənˈmentəlɪst environmentalist pronunciation American ɪnˌvaɪrənˈmentəlɪst
 
a person who is concerned about the natural environment and wants to improve and protect it
environmentalism
environmentalism pronunciation English environmentalism pronunciation American
noun [uncountable]