/ ˌɑːbɪˈtreɪʃn; NAmE ˌɑːrb-/ noun
[ U ] the official process of settling an argument or a disagreement by sb who is not involved :
Both sides in the dispute have agreed to go to arbitration .
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WORD ORIGIN
late Middle English : from Latin arbitratio(n-) , from the verb arbitrari , from arbiter judge, supreme ruler.