interregnum
Pronunciation:
/ˌɪntəɹˈɹɛɡnəm/noun
Definitions
The period of time between the end of a sovereign's reign and the accession of another sovereign.
Example: The Sasanian Interregnum of 628-632
A period of time during which normal executive leadership is suspended or interrupted.
An intermission in any order of succession; any breach of continuity in action or influence.