/ Dictionary / Index R raison d'être: Meaning and Definition of Find definitions for: rai•son d'ê•tre Pronunciation: (rā'zōn de'tru Fr. re&sylpzôn de'tr&supschwa), [key] — pl. rai•sons d'ê•tre reason or justification for being or existence: Art is the artist's raison d'être. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. raison d'état* raisonneur Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language