SynonymDefinitionAntonym.com - English Synonym Dictionary

Testimony by word or deed to your religious faith

Someone who sees an event and reports what happened

A close observer; someone who looks at something (such as an exhibition of some kind)

(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

Be a witness to

Perceive or be contemporaneous with