attest

v. certify, testify; confirm

Verb
1. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness"
(synonym) certify, manifest, demonstrate, evidence
(hypernym) testify, bear witness, prove, evidence, show
(hyponym) authenticate
(derivation) attestation
2. authenticate, affirm to be true, genuine, or correct, as in an official capacity; "I attest this signature"
(hypernym) affirm, verify, assert, avow, aver, swan, swear
(derivation) attestation
3. give testimony in a court of law
(synonym) testify, take the stand, bear witness
(hypernym) declare
(hyponym) vouch
(derivation) attestation
(classification) law, jurisprudence
4. establish or verify the usage of; "This word is not attested until 1993"
(hypernym) show
(verb-group) certify, manifest, demonstrate, evidence
(derivation) attestation

n. medical certificate, document from a medical practitioner certifying illness

n. certificate, testimony, statement under oath

(v. t.)
To give proof of; to manifest; as, the ruins of Palmyra attest its ancient magnificence.
  

(v. t.)
To call to witness; to invoke.
  

(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.
  

(n.)
Witness; testimony; attestation.