witness
Definitions
A person who sees an event, typically a crime or accident, take place.
A person who gives evidence in a court of law.
To see an event take place or to serve as evidence of a particular fact or occurrence.
Examples
The police are looking for anyone who might have been a witness to the accident.
It was a privilege to witness such a historic moment in our nation's history.
She was asked to sign the document as a witness to the agreement.
Synonyms
observer eyewitness onlooker bystander spectator testifier deponent