/ Dictionary / Index R riv.: Meaning and Definition of Find definitions for: riv. Pronunciation: [key] river. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ritzy rivage Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language