/ Dictionary / Index O oughtn't: Meaning and Definition of Find definitions for: ought•n't Pronunciation: (ôt'nt), [key] contraction of ought not. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oughtlins ouguiya Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language