a person who settles a dispute or has ultimate authority in a matter
仲裁人,公断人
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the military acted as arbiter of conflicts between political groups. 军方担任了不同政治团体之间纷争的仲裁人。
a person whose views or actions have great influence over trends in social behaviour
(社会行为的)评判人,引领者
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an arbiter of taste. 品味的引领者。
" late Middle English: from Latin, ‘judge, supreme ruler’. "