INTERREGNUMS

Noun

interregnums

plural of interregnum

Source: Wiktionary

INTERREGNUM

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