Regent

Ruling; governing; regnant.

Exercising vicarious authority.

One who rules or reigns; a governor; a ruler.

Especially, one invested with vicarious authority; one who governs a kingdom in the minority, absence, or disability of the sovereign.

One of a governing board; a trustee or overseer; a superintendent; a curator; as, the regents of the Smithsonian Institution.

A resident master of arts of less than five years' standing, or a doctor of less than twwo. They were formerly privileged to lecture in the schools.