1.(arbitrator)仲裁人；公断人；仲裁机构
The Court was an arbiter between the States and the federal government.法院是各州与联邦政府之间的仲裁者。
2.to be the arbiter on sth<正式>(be an authority)是…的裁决者
He was the ultimate arbiter on theological and political matters.他是神学和政治事务的最终裁决者。