arbitrate C2+

/ˈɑrbɪˌtreɪt/ to settle a dispute by acting as an impartial judge between parties

arbitration C2+

/ˌɑrbɪˈtreɪʃən/ the settling of a dispute by an impartial third party outside court

arbitrator C2+

/ˈɑrbɪˌtreɪtɚ/ an impartial person chosen to settle a dispute