witness in WordNet English dictionary

1. (law) a person who attests to the genuineness of a document or signature by adding their own signature
   witness  attestant  attestor  attestator 
   
2. someone who sees an event and reports what happened
   witness  witnesser  informant 
   
3. a close observer; someone who looks at something (such as an exhibition of some kind)
   "the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star"
   spectator  witness  viewer  watcher  looker 
   
4. testimony by word or deed to your religious faith
   witness 
   
5. (law) a person who testifies under oath in a court of law
   witness 
   

1. perceive or be contemporaneous with
   "We found Republicans winning the offices"; "You'll see a lot of cheating in this school"; "The 1960's saw the rebellion of the younger generation against established traditions"; "I want to see results"
   witness  find  see 
   
2. be a witness to
   "She witnessed the accident and had to testify in court"
   witness