Definitions

1. noun

A person or thing that has the power to make decisions or judgments, especially in a matter that is in dispute.

“The judge acted as an arbiter in the dispute between the two neighbors.”

2. noun

A person who decides the winner of a contest, especially a chess game or a tournament.

“The chess grandmaster served as the arbiter in the championship match.”

3. verb

To decide or settle a matter or dispute.

“The referee will arbitrate the dispute between the teams.”