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attest (v.)

1590s, "bear witness to, officially confirm; give proof or evidence of," from Middle French attester (Old French atester, 13c.) "affirm, bear witness to," from Latin attestari "confirm, prove," literally "bear witness to," from assimilated form of ad "to" (see ad-) + testari "bear witness," from testis "witness" (see testament). Related: Attested; attesting.

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Definitions of attest from WordNet

attest (v.)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes;
His high fever attested to his illness
attest (v.)
authenticate, affirm to be true, genuine, or correct, as in an official capacity;
I attest this signature
attest (v.)
give testimony in a court of law;
Synonyms: testify / take the stand / bear witness
attest (v.)
establish or verify the usage of;
This word is not attested until 1993
From wordnet.princeton.edu