/ Dictionary / Index F fanaticism: Meaning and Definition of Find definitions for: fa•nat•i•cism Pronunciation: (fu-nat'u-sīz"um), [key] — n. fanatical character, spirit, or conduct. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fanaticism (Thesaurus) fanatical fanaticize Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language