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Definition of interregnum noun from the Oxford Advanced American Dictionary

 

interregnum

 noun
noun
NAmE//ˌɪntərˈrɛɡnəm//
 
[usually singular] (formal)
 
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a period of time during which a country, an organization, etc. does not have a leader and is waiting for a new one
See the Oxford Advanced Learner's Dictionary entry: interregnum