noun witness; testimony; attestation.
2. attest ·vt to call to witness; to invoke.
3. attest ·vt to give proof of; to manifest; as, the ruins of palmyra attest its ancient magnificence.
4. attest ·vt 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.