/ Dictionary / Index I illusory: Meaning and Definition of Find definitions for: il•lu•so•ry Pronunciation: (i-l'su-rē, -zu-), [key] — adj. causing illusion; deceptive; misleading. of the nature of an illusion; unreal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illusory (Thesaurus) illusive illust. 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