Meaning : Be a witness to.
Example :
She witnessed the accident and had to testify in court.
Meaning : Testimony by word or deed to your religious faith.
Meaning : (law) a person who attests to the genuineness of a document or signature by adding their own signature.
Synonyms : attestant, attestator, attestor
Meaning : (law) a person who testifies under oath in a court of law.