/ Dictionary / Index S synonymous: Meaning and Definition of Find definitions for: syn•on•y•mous Pronunciation: (si-non'u-mus), [key] — adj. having the character of synonyms or a synonym; equivalent in meaning; expressing or implying the same idea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: synonymous (Thesaurus) synonymize synonymy Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language