/ Dictionary / Index R rivalrous: Meaning and Definition of Find definitions for: ri•val•rous Pronunciation: (rī'vul-rus), [key] — adj. characterized by rivalry; competitive: the rivalrous aspect of their friendship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rivalrous (Thesaurus) rival rivalry Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language