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arbitrate  (arbitrates 3rd person present) (arbitrating present participle) (arbitrated past tense )When someone in authority arbitrates between two people or groups who are in dispute, they consider all the facts and make an official decision about who is right.  verb 
He arbitrates between investors and members of the association...  V between pl-n 
 arbitrator  (arbitrators plural) n-count 
He served as an arbitrator in a series of commercial disputes in India.