/ Dictionary / Index O odds-on: Meaning and Definition of Find definitions for: odds-on Pronunciation: (odz'on', -ôn'), [key] — adj. being the one more or most likely to win, succeed, attain, or achieve something: the odds-on favorite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: odds-on (Thesaurus) oddsmaker odds or evens. Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language