/ Dictionary / Index O opposite number: Meaning and Definition of Find definitions for: op'posite num'ber Pronunciation: [key] counterpart; equivalent: New members with an interest in folk art will find their opposite numbers in the association's directory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. opposite opposite prompt Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language