a witness: someone who can testify to what they have seen and know, especially before a court
At its heart this word names a person who can stand up and say what happened, what is true, what they themselves saw. It comes straight out of the world of the law court, where a witness gives evidence and a case is settled by their word. The Greek Old Testament had already taken this courtroom word and put it to work for God's covenant: heaven and earth are called as witnesses against Israel, and in Isaiah God puts the nations on trial and summons his own people to take the stand and testify that he alone is God.
The New Testament inherits the full range of that picture, and the senses below are not different words but the same idea in different settings:
- in one verse a witness is literally giving evidence at a trial
- in another, God himself is called to witness that a person is telling the truth
- in the Gospels and Acts the apostles are witnesses in the strongest sense, people who saw the risen Jesus and now testify to it publicly
- in Revelation the faithful witness is someone who keeps telling the truth about God even when a hostile power threatens to kill them for it
That last setting is where the English word gets dangerous. Because some of these witnesses were in fact put to death for their testimony (μαρτυρία), the word slowly traveled toward our word "martyr." But that final step happens after the New Testament was written. Throughout the New Testament the word still means "witness"; where death enters the picture it is the cost of the testimony (μαρτυρία), not part of what the word itself means.