ar ‧ bi ‧ ter /ˈɑːbətə, ˈɑːbɪtə $ ˈɑːrbətər/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: arbitre , from Latin arbiter ]
1 . someone who influences society’s opinions about what is ↑ stylish , socially acceptable etc:
The designer has received rave reviews from such arbiters of taste as ‘Elle’ magazine.
2 . someone or something that settles an argument between two opposing sides SYN judge :
The European Court of Justice will be the final arbiter (=make the final decision) in the dispute.