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"2. authenticate, affirm to be true, genuine, or correct, as in an official capacity;
"I attest this signature"3. give testimony in a court of law
4. establish or verify the usage of;
"This word is not attested until 1993"