attest

Etymology

PIE word *tréyes Borrowed from Middle French attester, from Latin attestor (“to witness to, bear witness”), from at-, combining form of ad (“to”) + testor (“to bear witness”), from testis (“a witness”).

verb

1. (transitive) To affirm to be correct, true, or genuine.
   When will the appraiser attest the date of the painting?
   As the Wildlings can attest, there’s already new life even north of the wall, poking up through the ice. Winter only lasts so long. 19 May 2019, Alex McLevy, “The final Game Of Thrones brings a pensive but simple meditation about stories (newbies)”, in The A.V. Club
2. (transitive) To certify by signature or oath.
   You must attest your will in order for it to be valid.
3. (transitive) To certify in an official capacity.
4. (transitive, intransitive) To supply or be evidence of.
   Her fine work attested her ability.
5. (transitive) To put under oath.
6. (transitive, obsolete) To call to witness; to invoke.