/ Dictionary / Index C circumstantiate: Meaning and Definition of Find definitions for: cir•cum•stan•ti•ate Pronunciation: (sûr"kum-stan'shē-āt"), [key] — -at•ed, -at•ing. to set forth or support with circumstances or particulars: Documents circumstantiated her evidence. to describe fully or minutely: He circumstantiated the accident. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: circumstantiate (Thesaurus) circumstantiality circumstellar Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language