Person whose mission is to settle a dispute in place of a public judge; member of an arbitral tribunal Person chosen to settle a debate or calm a quarrel (in this sense, can also be female): Take a mutual friend as arbiter of a dispute Person, group who, because of circumstances, can impose its will: This small party is the arbiter of the electoral consultation. Person in charge of directing a match, to make respect the rules of the game by the adversaries.