arbiter

ar|bi|ter /'ɑːrbɪtər/ (arbiters)
1 [N-COUNT]
An arbiter is a person or institution that judges and settles a quarrel between two other people or groups. (FORMAL)
He was the ultimate arbiter on both theological and political matters.
= adjudicator
2 [N-COUNT] usu N of n
An arbiter of taste or style is someone who has a lot of influence in deciding what is fashionable or socially desirable. (FORMAL)

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