Definition of arbiter noun from the Oxford Advanced Learner's Dictionary

 

arbiter

 noun
noun
BrE BrE//ˈɑːbɪtə(r)//
 
; NAmE NAmE//ˈɑːrbɪtər//
 
 
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arbiter (of something) (formal) a person with the power or influence to make judgements and decide what will be done or accepted The law is the final arbiter of what is considered obscene. an arbiter of taste/style/fashion This style would be dismissed as too ornate by contemporary arbiters of taste. Word Origin late Middle English: from Latin, ‘judge, supreme ruler’.Extra examples This style would be dismissed as too ornate by contemporary arbiters of taste.
See the Oxford Advanced American Dictionary entry: arbiter