/ Dictionary / Index O omissive: Meaning and Definition of Find definitions for: o•mis•sive Pronunciation: (ō-mis'iv), [key] — adj. neglecting; leaving out. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: omissive (Thesaurus) omission omit 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