Definition of "Reign" :

noun: royal authority; the dominion of a monarch

noun: the period during which a monarch is sovereign

"During the reign of Henry VIII."

noun: a period during which something or somebody is dominant or powerful

"He was helpless under the reign of his egotism."

verb: have sovereign power

"Henry VIII reigned for a long time."

verb: be larger in number, quantity, power, status or importance

"Money reigns supreme here."