The Collaborative International Dictionary of English v.0.48:

Elector \E*lect"or\, a. [Cf. F. ['e]lectoral.]
   Pertaining to an election or to electors.
   [1913 Webster]

         In favor of the electoral and other princes. --Burke.
   [1913 Webster]

   Electoral college, the body of princes formerly entitled to
      elect the Emperor of Germany; also, a name sometimes
      given, in the United States, to the body of electors
      chosen by the people to elect the President and Vice
      President.
      [1913 Webster]

WordNet (r) 3.0 (2006):

electoral college
    n 1: the body of electors who formally elect the United States
         president and vice president