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English definition of “environmentalist”

environmentalist

noun [C] uk   /ɪnˌvaɪ.rənˈmen.təl.ɪst/ us    /-ˌvaɪr.ənˈmen.t̬əl-/
C1 a person who is interested in or studies the environment and who tries to protect it from being damaged by human activities
(Definition of environmentalist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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