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interregnum

Syllabification: (in·ter·reg·num)

Pronunciation: /ˌintərˈregnəm/

Definition of interregnum

noun (plural interregnums or interregna /-nə/)

a period when normal government is suspended, especially between successive reigns or regimes.
an interval or pause:the interregnum between the discovery of radioactivity and its detailed understanding

Origin:

late 16th century (denoting temporary rule between reigns or during suspension of normal government): from Latin, from inter- 'between' + regnum 'reign'