/ Dictionary / Index E extremism: Meaning and Definition of Find definitions for: ex•trem•ism Pronunciation: (ik-strē'miz-um), [key] — n. a tendency or disposition to go to extremes or an instance of going to extremes, esp. in political matters: leftist extremism; the extremism of the Nazis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extremism (Thesaurus) extreme unction extremist Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language