verb perceive or be contemporaneous with.
— synonyms: find, see
noun someone who sees an event and reports what happened.
— synonyms: witnesser, informant
noun a close observer.
— synonyms: spectator, viewer, watcher, looker
noun testimony by word or deed to your religious faith.
noun (law) a person who attests to the genuineness of a document or signature by adding their own signature.
— synonyms: attestant, attestor, attestator
noun (law) a person who testifies under oath in a court of law.
Examples
“She can bear witness, since she was there at the time.”
“As a witness to the event, I can confirm that he really said that.”
“The witness for the prosecution did not seem very credible.”