/ Dictionary / Index O Ont.: Meaning and Definition of Find definitions for: Ont. Pronunciation: [key] Ontario. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. on-stream on-target Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language