Definition of "attest" in English

verb

1. (transitive) To affirm to be correct, true, or genuine.

   • When will the appraiser attest the date of the painting?

2. (transitive) To certify by signature or oath.

   • You must attest your will in order for it to be valid.

3. (transitive) To certify in an official capacity.

4. (ambitransitive) To supply or be evidence of.

   • Her fine work attested her ability.

5. (transitive) To put under oath.

6. (transitive, obsolete) To call to witness; to invoke.