/ Dictionary / Index I illusionism: Meaning and Definition of Find definitions for: il•lu•sion•ism Pronunciation: (i-l'zhu-niz"um), [key] — n. a technique of using pictorial methods in order to deceive the eye. Cf. trompe l'oeil. a theory or doctrine that the material world is an illusion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illusionary illusionist 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