witness

Attestation of a fact or event; testimony.

“She can bear witness, since she was there at the time.”

One who sees or has personal knowledge of something.

“As a witness to the event, I can confirm that he really said that.”

Someone called to give evidence in a court.

“The witness for the prosecution did not seem very credible.”

One who is called upon to witness an event or action, such as a wedding or the signing of a document.

“The bridesmaid and best man at a wedding typically serve as the witnesses.”

Something that serves as evidence; a sign or token.

To furnish proof of, to show.

“1667: round he throws his baleful eyes / That witness'd huge affliction and dismay — John Milton, Paradise Lost, Book 1 ll. 56-7”

To take as evidence.

To see or gain knowledge of through experience.

“He witnessed the accident.”

(construed with to or for) To present personal religious testimony; to preach at (someone) or on behalf of.

To see the execution of (a legal instrument), and subscribe it for the purpose of establishing its authenticity.

“to witness a bond or a deed”