Webster's English Dictionary

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reign

1. reign \'ra-n\ n [ME regne, fr. OF, fr. L regnum, fr. reg-, rex king -] 
   more at ROYAL 1a: royal authority : SOVEREIGNTY  1b: the dominion, sway, or 
   influence of one resembling a monarch  2: the period of reign of a 
   sovereign 
2. reign vi 1a: to possess or exercise sovereign power : RULE  1b: to hold 
   office as chief of state although exercising minimal powers of  making and 
   executing governmental policy 2: to exercise authority or hold sway in the 
   manner of a monarch  3: to be predominant or prevalent