a person who exercises the ruling power in a kingdom during the minority, absence, or disability of the sovereign.

a ruler or governor.

a member of the governing board of a state university or a state educational system.

a university officer who exercises general supervision over the conduct and welfare of the students.

(in certain Catholic universities) a member of the religious order who is associated in the administration of a school or college with a layperson who is its dean or director.

acting as regent of a country; exercising ruling authority in behalf of a sovereign during his or her minority, absence, or disability (usually used postpositively)

a prince regent.

noun

director , governor , minister , official , ruler , viceroy