One who attests.

plural of attester

present participle of attest

plural of attestation

A thing that serves to bear witness, confirm, or authenticate; validation, verification, documentation. / A confirmation or authentication.

(transitive) To affirm to be correct, true, or genuine. / (transitive) To certify by signature or oath. / (transitive) To certify in an official capacity.

simple past tense and past participle of attest

Proven; shown to be true with evidence. / Supported with testimony. / Certified as good, correct, or pure. / (linguistics) Of words or languages, proven to have existed by records.

Third-person singular simple present indicative form of attest

Able to be attested.