1. Authenticate, affirm to be true, genuine, or correct, as in an official capacity
   "I attest this signature"
    
2. Provide clear proof or evidence of something through actions, behaviour, or observable qualities
   "His high fever attested to his illness";
   - manifest, demonstrate, evidence
    
3. Establish or verify the usage of
   "This word is not attested until 1993"
    
4. (law) give testimony in a court of law
   "She attested to seeing the accident";
   - testify, take the stand, bear witness, witness

Derived forms: attests, attested, attesting

Type of: affirm, assert, aver, avow, bear witness, declare, evidence, pronounce, prove, show, swear, testify, verify, witness

Encyclopedia: Attest