noun

1. Attestation of a fact or event; testimony.

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

2. One who sees or has personal knowledge of something.

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

3. Someone called to give evidence in a court.

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

verb

1. 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”

2. To take as evidence.

3. To see or gain knowledge of through experience.

   “He witnessed the accident.”

Synonyms: certify