/ Dictionary / Index E extremist: Meaning and Definition of Find definitions for: ex•trem•ist Pronunciation: (ik-strē'mist), [key] — n. a person who goes to extremes, esp. in political matters. a supporter or advocate of extreme doctrines or practices. —adj. belonging or pertaining to extremists. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extremist (Thesaurus) extremism extremity Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language