Available Definitions:
1) v. t. - 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.
2) v. t. - To give proof of; to manifest; as, the ruins of Palmyra attest its ancient magnificence.
3) v. t. - To call to witness; to invoke.
4) n. - Witness; testimony; attestation.