| Circumstantiate 1. (v. t.) To place in particular circumstances; to invest with particular accidents or adjuncts. 2. (v. t.) To prove or confirm by circumstances; to enter into details concerning. Thesaurus Entries adduce, affirm, anatomize, atomize, attest, authenticate, back, back up, bear out, bolster, buttress, certify, cite, confirm, corroborate, descend to particulars, detail, document, enter into detail, fortify, give full particulars, instance, itemize, particularize, probate, prove, ratify, reinforce, specify, spell out, strengthen, substantiate, support, sustain, undergird, uphold, validate, verify, warrant |