A person eligible to vote in an election; a member of an electorate, a voter.
A member of an electoral college; specifically (US) an official selected by a state as a member of the Electoral College to elect the president and vice president of the United States.
A person eligible to vote to elect a Member of Parliament.
A person who rules or governs; someone or something that exercises dominion or controlling power over others.
A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings.
To beat with a ruler (as a traditional school punishment).