attest
vb
1 tr to affirm the correctness or truth of
2 when intr, usually foll by: to to witness (an act, event, etc.) or bear witness to (an act, event, etc.) as by signature or oath
3 tr to make evident; demonstrate
his life of luxury attests his wealth
4 tr to provide evidence for
the marks in the ground attested the presence of a fossil
(C16: from Latin attestari to prove, from testari to bear witness, from testis a witness)
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attestable adj
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attestant, attester (esp. in legal usage)
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attestor, attestator n
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attestation n