Definition of interregnum noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌɪntəˈreɡnəm//
; NAmE NAmE//ˌɪntəˈreɡnəm//
[usually singular] (pl. interregnums) (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 Word Originlate 16th cent. (denoting temporary rule between reigns or during suspension of normal government): from Latin, from inter- ‘between’ + regnum ‘reign’.
See the Oxford Advanced American Dictionary entry: interregnum