n.
    - a person who sees an event take place.
 - a person giving sworn testimony to a court of law or the police.
 - a person who is present at the signing of a document and signs it themselves to confirm this.
 - evidence; proof. 
▸open profession of one's religious faith through words or actions.
 
v.
   - be a witness to.
 - be the place, period, etc. in which (an event or development) takes place.
 - be a sign or proof of. 
▸
(witness to)
 openly profess one's religious faith in.
 
 
  Etymology
  OE witnes (see wit1, -ness).