reign

(noun) a period during which something or somebody is dominant or powerful. Example: "He was helpless under the reign of his egotism."

(noun) the period during which a monarch is sovereign. Example: "During the reign of henry viii."

(noun) royal authority; the dominion of a monarch. Synonyms: sovereignty.

(verb) have sovereign power. Example: "Henry viii reigned for a long time."

(verb) be larger in number, quantity, power, status or importance. Synonyms: predominate, dominate, rule, prevail. Examples: "Money reigns supreme here." "Hispanics predominate in this neighborhood."