Attest

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

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.