Definition of environmentalist noun from the Oxford Advanced American Dictionary

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environmentalist

noun
/ɪnˌvaɪərnˈmɛntlɪst; ɪnˌvaɪrənˈmɛntlɪst/
 
 
a person who is concerned about the natural environment and wants to improve and protect it
environmentalism
/ɪnˌvaɪərnˈmɛntlˌɪzəm/
 
/ɪnˌvaɪrənˈmɛntlˌɪzəm/
 
noun [uncountable]
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