Authenticate

v. t.	1.	To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit. [imp. & p. p. Authenticated ( ); p. pr. & vb. n. Authenticating ( ).] The king serves only as a notary to authenticate the choice of judges. - Burke.
	2.	To prove authentic; to determine as real and true; as, to authenticate a portrait.

Verb

1.

authenticate - establish the authenticity of something

OK, accept, accredit, affirm, amen, approve, attest, authorize, autograph, avouch, back, back up, bear out, bolster, buttress, certify, circumstantiate, confirm, corroborate, cosign, countersign, demonstrate, document, endorse, fortify, give permission, give the go-ahead, give the imprimatur, give thumbs up, initial, justify, notarize, pass, pass on, pass upon, permit, probate, prove, ratify, reinforce, rubber stamp, sanction, say amen to, seal, second, sign, sign and seal, strengthen, subscribe to, substantiate, support, sustain, swear and affirm, swear to, test, try, undergird, undersign, underwrite, uphold, visa, vise, vouch for

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