(~s)
1.
An ~ is a person or institution that judges and settles a quarrel between two other people or groups. (FORMAL)
He was the ultimate ~ on both theological and political matters.
= adjudicator
N-COUNT
2.
An ~ of taste or style is someone who has a lot of influence in deciding what is fashionable or socially desirable. (FORMAL)
N-COUNT: usu N of n