verb: 1. to make more certain; confirm: He corroborated my account of the accident. 2. to confirm or support (facts, opinions, etc), esp by providing fresh evidence: the witness corroborated the accused's statement. 3. to support with evidence or authority : make more certain. adjective (Archaic): 1. confirmed. 2. serving to corroborate a fact, an opinion, etc. 3. (of a fact) corroborated. Related Words: authenticate, confirm, substantiate, verify, validate, justify, ratify, okay, prove, strengthen, approve, support, certify, sustain, endorse, document, establish, rubber-stamp. Synonyms: verify, authenticate, support, validate, argue, attest, authenticate, bear out, certify, confirm, substantiate, support, validate, verify, vindicate. Antonyms: disprove, rebut, refute. Synonym Study: Confirm, corroborate, substantiate, verify, authenticate, validate mean to attest to the truth or validity of something. Confirm implies the removing of doubts by an authoritative statement or indisputable fact: confirmed the reports. Corroborate suggests the strengthening of what is already partly established: witnesses corroborated his story. Substantiate implies the offering of evidence that sustains the contention: the claims have yet to be substantiated. Verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at: all statements of fact in the article have been verified. Authenticate implies establishing genuineness by adducing legal or official documents or expert opinion: handwriting experts authenticated the diaries. Validate implies establishing validity by authoritative affirmation or by factual proof: validated the hypothesis by experiments. Origin: 1520–30; < Latin corrōborātus past participle of corrōborāre to strengthen, equivalent to cor- cor- + rōbor(āre) to make strong (derivative of rōbor, rōbur oak (hence, strength); see robust) + -ātus -ate^1. C16: from Latin corrōborāre to invigorate, from rōborāre to make strong, from rōbur strength, literally: oak. First Known Use: 1529. History and Etymology: Latin corroboratus, past participle of corroborare, from com- + robor-, robur strength. Source 1, Source 2.