Arbiter (noun)

1. A person who has the power to decide an issue or dispute.
2. A person authorized to make a binding decision.

Origin:

Late 16th century: from latin, "judge, arbitrator", from arbitrari "to judge, decide", from arbiter "judge".

Examples:

1. The judge acted as an arbiter in the dispute between the two companies.
2. The arbiter was appointed to decide the final outcome of the game.
3. The arbiter listened to both sides of the argument before making a decision.
4. The arbiter's decision was final and binding.
5. The arbiter was impartial in his judgment.