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English definition of “reign”

reign

noun [C]     /reɪn/
C1 the period of time when a king or queen rules a country: the reign of Henry VIIIRuling and governing a period when a particular person, feeling, or quality is very important or has a strong influence: his successful reign as manager of the teamBeing important and having importance
(Definition of reign noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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