Etymology
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extremist (n.)

"one who goes to extremes, a supporter of extreme doctrines," 1840, from extreme + -ist.

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Definitions of extremist
1
extremist (n.)
a person who holds extreme views;
2
extremist (adj.)
(used of opinions and actions) far beyond the norm;
extremist political views
Synonyms: radical / ultra
From wordnet.princeton.edu