reign /ɹeɪ̯n/verb 4noun 3forms 5phrases 1 verb4 •To exercise sovereign power, to rule as a monarch.He reigned in an autocratic manner. •(nonstandard, rare) To reign over (a country)The House of Piast reigned Poland from its foundation to 1385. — 2007 •To be a dominant quality of a place or situation; to prevail, predominate, rule.Silence reigned. •To be the winner of the most recent iteration of a competition. noun3 •The exercise of sovereign power.England prospered under Elizabeth I's reign. •The period during which a monarch rules.The reign of Victoria was a long one. •The territory or sphere over which a kingdom; empire; realm; dominion, etc. is ruled.And the Fox guileful, and most covetous; / That neither pleased was, to have the reign / Twixt them divided into even twain — 1591 formsreigned · reigning · reigneth · reigns · reignest Phrases with reign reign supremeTo be the most important or most prevalent.