American English

Definition of arbiter noun from the Oxford Advanced American Dictionary

 

arbiter

 noun
noun
NAmE//ˈɑrbət̮ər//
 
arbiter (of something)
 
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a person with the power or influence to make judgments 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
See the Oxford Advanced Learner's Dictionary entry: arbiter