Dictionary definition · witness
noun
- someone who sees an event and reports what happened
- a close observer; someone who looks at something (such as an exhibition of some kind)"the spectators applauded the performance"
- testimony by word or deed to your religious faith
- (law) a person who attests to the genuineness of a document or signature by adding their own signature
- (law) a person who testifies under oath in a court of law
verb
- be a witness to"She witnessed the accident and had to testify in court"
- perceive or be contemporaneous with"We found Republicans winning the offices"
Source: Open English WordNet (CC BY 4.0).