Meaning : Provide evidence for. Stand as proof of. Show by one's behavior, attitude, or external attributes.
Example :
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.
Synonyms : certify, demonstrate, evidence, manifest
Meaning : Authenticate, affirm to be true, genuine, or correct, as in an official capacity.
Example :
I attest this signature.
Meaning : Give testimony in a court of law.
Synonyms : bear witness, take the stand, testify
Meaning : Establish or verify the usage of.
Example :
This word is not attested until 1993.