adjudicator
noun [ C ] uk/əˈdʒuː.dɪ.keɪ.tər/ us/əˈdʒuː.də.keɪ.t̬ɚ/
仲裁人；仲裁机构
a person or group that makes an official decision about something, especially about who is right in a disagreement
She acted as adjudicator in the dispute. 她担任了这场争端的裁定人。