Source : Webster's Revised Unabridged Dictionary (1913)

Elector \E*lect"or\, n. [L., fr. eligere: cf. F. ['e]lecteur.]
   1. One who elects, or has the right of choice; a person who
      is entitled to take part in an election, or to give his
      vote in favor of a candidate for office.

   2. Hence, specifically, in any country, a person legally
      qualified to vote.

   3. In the old German empire, one of the princes entitled to
      choose the emperor.

   4. One of the persons chosen, by vote of the people in the
      United States, to elect the President and Vice President.

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

         In favor of the electoral and other princes. --Burke.

   {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.

Source : WordNet®

elector
     n 1: a citizen who has a legal right to vote [syn: {voter}]
     2: any of the German princes who were entitled to vote in the
        election of new emperor of the Holy Roman Empire