- certify
- v1. confirm, verify, validate, authenticate, testify to, attest to, certificate; corroborate, substantiate, sustain, uphold, support, prove, document, manifest, show, establish; depose, bear witness to, evidence, offer evidence for.2. accredit, ratify, sanction, approve of, give one's stamp or seal of approval, pass judgment on, Inf.O.K.3. assure, asseverate, avow, vow, give one's solemn word or promise, offer assurance, state on one's honor, pledge, swear to, state under oath, Inf. promise; avouch, affirm, assert, declare, state emphatically, say for certain or sure.4. guarantee, warrant, insure, ensure, indemnify; endorse, vouch for, notarize, witness, underwrite, countersign, cosign for, back up, stand behind.
A Note on the Style of the synonym finder. 2014.