/ Dictionary / Index I isn't: Meaning and Definition of Find definitions for: isn't Pronunciation: (iz'unt), [key] contraction of is not. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isnad iso 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