Etymology
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conservationist (n.)

"advocate of conservation," 1861, from conservation + -ist. The ecological sense is from 1903. Conservatist (1849) was used in the sense "conservative."

updated on March 07, 2018

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Definitions of conservationist from WordNet

conservationist (n.)
someone who works to protect the environment from destruction or pollution;
Synonyms: environmentalist
From wordnet.princeton.edu, not affiliated with etymonline.