INTERREGNUM
interregnum
(noun) the time between two reigns, governments, etc.
Source: WordNet® 3.1
Etymology
Noun
interregnum (plural interregnums or interregna)
The period of time between the end of a sovereign's reign and the accession of another sovereign.
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.
Synonyms
• (breach of continuity in action): hiatus, moratorium, recess; see also pause
Source: Wiktionary
In`ter*reg"num, n.; pl. Interregnums. Etym: [L., fr. inter between +
regnum dominion, reign. See Reign, and cf. Interreign.]
1. The time during which a throne is vacant between the death or
abdication of a sovereign and the accession of his successor.
2. Any period during which, for any cause, the executive branch of a
government is suspended or interrupted.
Source: Webster’s Unabridged Dictionary 1913 Edition