Definition: arbitrator

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Source: WordNet (r) 1.7 

arbitrator
     n : someone chosen to judge and decide a disputed issue [syn: arbiter]

Source: Webster's Revised Unabridged Dictionary (1913) 

Arbitrator \Ar"bi*tra`tor\, n. [L., fr. arbitrari: cf. F.
   arbitrateur.]
   1. A person, or one of two or more persons, chosen by parties
      who have a controversy, to determine their differences.
      See Arbitration.

   2. One who has the power of deciding or prescribing without
      control; a ruler; a governor.

            Though Heaven be shut, And Heaven's high Arbitrators
            sit secure.                           --Milton.

            Masters of their own terms and arbitrators of a
            peace.                                --Addison.

   Syn: Judge; umpire; referee; arbiter. See Judge.