Interregnum \In`ter*reg"num\, n.; pl. {Interregnums}. [L., fr.
inter between + regnum dominion, reign. See {Reign}, and cf.
{Interreign}.]
[1913 Webster]
1. The time during which a throne is vacant between the death
or abdication of a sovereign and the accession of his
successor.
[1913 Webster]
2. Any period during which, for any cause, the executive
branch of a government is suspended or interrupted.
[1913 Webster]