noun
(now rare) A ruler.
One who rules in place of the monarch, especially because the monarch is too young, absent, or disabled.
(now chiefly historical) A member of a municipal or civic body of governors, especially in certain European cities.
(Scotland, Canada, US) A member of governing board of a college or university; also a governor of the Smithsonian Institution in Washington, D.C.
(Indonesia) The chief executive of a regency.
adjective
Ruling; governing; regnant.
Exercising vicarious authority.