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English word reign comes from Latin regno, Latin regnum, and later Middle English regnen (To reign; to rule.)
regno (Latin)
(figuratively) I dominate, prevail. I govern. I reign, rule (as a monarch).. I tyrannize.
regnum (Latin)
Kingship, royalty. Royal power, power, control, kingdom, reign.
regner (Old French)
regnen (Middle English)
To reign; to rule.
reign (English)
(ambitransitive) To exercise sovereign power, or to rule as a monarch. The exercise of sovereign power.. The period during which a monarch rules.. The territory or sphere over which a kingdom; empire; realm; dominion, etc. is ruled.