'attest' definitions:

Definition of 'attest'

From: WordNet
verb
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" [syn: attest, certify, manifest, demonstrate, evidence]
verb
Authenticate, affirm to be true, genuine, or correct, as in an official capacity; "I attest this signature"
verb
Give testimony in a court of law [syn: testify, attest, take the stand, bear witness]
verb
Establish or verify the usage of; "This word is not attested until 1993"