/ Dictionary / Index S synonymy: Meaning and Definition of Find definitions for: syn•on•y•my Pronunciation: (si-non'u-mē), [key] — pl. -mies the quality of being synonymous; equivalence in meaning. the study of synonyms. a set, list, or system of synonyms. a list of the scientific names, with explanatory matter and location of type or types, for a particular taxonomic group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: synonymy (Thesaurus) synonymous synop. 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