to bear witness to; certify; declare to be correct, true, or genuine; declare the truth of, in words or writing, esp. affirm in an official capacity

to attest the truth of a statement.

to give proof or evidence of; manifest

His works attest his industry.

to put on oath.

to testify or bear witness (often fol. by to )

to attest to the reliability of an employee.

Archaic . witness; testimony; attestation.

verb

deny

verb

adjure , announce , argue , assert , asservate , authenticate , aver , bear out , bear witness , certify , confirm , corroborate , countersign , declare , demonstrate , display , exhibit , give evidence , indicate , prove , ratify , seal , show , substantiate , support , sustain , swear , testify , uphold , verify , warrant , witness , back , evidence , justify , validate , vouch , bespeak , betoken , mark , point to , affirm , avow , concentration , consideration , courtesy , diligence , indorse , invoke , mindfulness , observation , subscribe , vigilance