English definition of “witness”
/ˈwɪtnəs/ noun [C]
COURT › someone in a court of law who says what they have seen and what they know about a crime: The witness was called to the stand.
SEE › someone who sees an accident or crime: Police are appealing for witnesses to the shooting.
DOCUMENT › someone who signs their name on an official document to say that they were present when someone else signed it