ar ‧ bi ‧ tra ‧ tion /ˌɑːbəˈtreɪʃ ə n, ˌɑːbɪˈtreɪʃ ə n $ ˌɑːr-/ BrE AmE noun [uncountable]
the process of judging officially how an argument should be settled:
The dispute is going to arbitration (=someone is being asked to arbitrate) .
Both sides in the dispute have agreed to binding arbitration.