a person who sees or hears an event take place
a person who gives evidence, esp in a court of law
a person asked to be present, e.g. at a marriage, so as to be able to testify to its having taken place
a person who watches another sign a document and adds their own signature as an indication of authenticity
the act of certifying that a fact is true or an event has happened; testimony
something that serves as evidence; proof
public affirmation by word or example of religious faith or conviction