Definitions for "Attest"
To bear witness to; to certify; to affirm to be true or genuine; as, to attest the truth of a writing, a copy of record.
To call to witness; to invoke.
Witness; testimony; attestation.
To give proof of; to manifest; as, the ruins of Palmyra attest its ancient magnificence.
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness"
Vouching for a competitor's score by signing her scorecard at the end of a round.
Keywords:  verify, usage, establish, word
establish or verify the usage of; "This word is not attested until 1993"