Definition of interregna:
(n) :
The period of time between the end of a sovereign or political leader's reign and the accession of another.
(n) :
(politics) A period of time during which normal executive leadership is suspended or interrupted.
(n) :
(Christianity) the period of time between when a minister or pastor leaves a church and when a new one is installed
(n) :
(by extension) An intermission in any order of succession; any breach of continuity in action or influence.
(n) :
Ellipsis of British Interregnum, the period of 1649–1660 when an unmonarchical state ruled Britain; the monarchy was then restored.