Interregnum
Pronunciation : In`ter*reg"num
Part of Speech : n.;
Etymology : [L., fr. inter between + regnum dominion, reign. See Reign, and cf. Interreign.]
Definition : 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.
pl. Interregnums.
Source : Webster's Unabridged Dictionary, 1913