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)

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

witness - verb

• be a witness to
• perceive or be contemporaneous with

witness - thesaurus

attestant   attestator   attestor   find   informant   looker   see   spectator   viewer   watcher   witnesser