1. (v. t.) To bear witness to; to certify; to affirm to be genuine; as, to attest the truth of a writing.
2. (v. t.) To give proof of; to manifest; as, the ruins of Palmyra attest its ancient magnificence.
3. (v. t.) To call to witness; to invoke.
4. (n.) Witness; testimony; attestation.
Thesaurus Entries
acknowledge, affirm, allege, and candle, announce, approve, argue, assert, assert under oath, asseverate, assure, authenticate, aver, avouch, avow, back, back up, be sponsor for, bear out, bear witness, bespeak, betoken, bolster, bond, book, breathe, buttress, certify, circumstantiate, confirm, connote, corroborate, countersecure, declare, demonstrate, denote, depone, depose, disclose, display, document, endorse, ensure, evidence, evince, exhibit, express, fortify, furnish evidence, give evidence, give indication of, go to show, guarantee, guaranty, illustrate, imply, indicate, insure, involve, kiss the book, manifest, mark, point to, probate, prove, ratify, reinforce, secure, set forth, show, show signs of, sign, sign for, signalize, signify, speak for itself, speak volumes, sponsor, stand behind, stand up for, strengthen, subscribe to, substantiate, suggest, support, sustain, swear, swear by bell, swear the truth, swear to, swear to God, swear to goodness, symptomatize, tell, tend to show, testify, undergird, undersign, underwrite, uphold, validate, verify, vouch, vouch for, vouchsafe, vow, warrant, witness
