- witness, attestant, attestor, attestator - (law) a person who attests to the genuineness of a document or signature by adding their own signature
--1 is a kind of signer, signatory
Derived form: verb attest3 - attester, attestant - someone who affirms or vouches for the correctness or truth or genuineness of something
--2 is a kind of witness, witnesser, informant
Derived form: verb attest2