The Collaborative International Dictionary of English v.0.48:

Referee \Ref`er*ee"\ (-?), n.
   One to whom a thing is referred; a person to whom a matter in
   dispute has been referred, in order that he may settle it.
   [1913 Webster]

   Syn: Judge; arbitrator; umpire. See Judge.
        [1913 Webster]

WordNet (r) 3.0 (2006):

referee
    n 1: (sports) the chief official (as in boxing or American
         football) who is expected to ensure fair play [syn:
         referee, ref]
    2: someone who reads manuscripts and judges their suitability
       for publication [syn: reviewer, referee, reader]
    3: an attorney appointed by a court to investigate and report on
       a case
    v 1: be a referee or umpire in a sports competition [syn:
         referee, umpire]
    2: evaluate professionally a colleague's work [syn: referee,
       peer review]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "referee":
   JP, Justice, act between, adjudge, adjudicate, arbiter, arbitrate,
   arbitrator, bargain, bencher, critic, go between, hear, his honor,
   his lordship, his worship, hold court, hold the scales,
   impartial arbitrator, indicator, intercede, intermediate,
   interpose, intervene, judge, judger, justice, magistrate,
   make terms, mediate, meet halfway, moderate, moderator, negotiate,
   officiate, represent, sit in judgment, step in, third party,
   treat with, try, umpire, unbiased observer



Bouvier's Law Dictionary, Revised 6th Ed (1856):

REFEREE. A person to whom has been referred a matter in dispute, in order
that he may settle it. His judgment is called an award. Vide Arbitrator;
Reference.