/ Dictionary / Index I idée fixe*: Meaning and Definition of Find definitions for: i•dée fixe Pronunciation: (ē-dā fēks'), [key] — pl. i•dées fixes See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ideatum idem Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language