Elector

noun

1. A qualified voter in an election.
2. A member of the Electoral College of the United States.
3. One of the German princes of the Holy Roman Empire entitled to elect the emperor.
4. One who elects or has the right of choice; a person who has the legal right of voting for any functionary or the adoption of any measure; a voter.
5. Specifically— In the Roman-German empire, one of the seven or more princes who had the right to elect the emperor. As established by the Golden Bull of 1356, these were the spiritual electors of Mayence, Treves, and Cologne, and the temporal electors of the Rhine Palatinate, Saxony, Brandenburg, and Bohemia. Other German princes, as the rulers of Bavaria, Hanover, etc., also had voices in the college of electoral princes for longer or shorter periods. The original electors held also the great magisterial offices of the imperial court. The whole system passed away with the empire in 1806. The temporal princes holding the right were generally known by the title of elector in their several dominions.