Meaning of “extremist” in the English Dictionary

"extremist" in American English

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extremistnoun [ C ]

us /ɪkˈstri·mɪst/

someone who has an opinion or ideas that seem unreasonable to most people

extremism
noun [ U ] us /ɪkˈstriˌmɪz·əm/

political extremism

(Definition of “extremist” from the Cambridge Academic Content Dictionary © Cambridge University Press)