A person expected to inherit or take over an enterprise or undertaking once its current manager retires or dies.
A person designated and raised to become the next emperor.
A person designated and raised to become the next king.
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.