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]