INTERREGNUM

interregnum (in-t<<schwa>>-reg-n<<schwa>>m).1. An interval between reigns; the time when a throne is vacant between the reign of a sovereign and the accession of a successor. 2.Archaic. Authority exercised during a temporary vacancy of the throne or a suspension of the regular government. 3. A break or pause in a continuous event.

[Blacks Law 8th]