D defs.my
Entry 2 senses Webster, 1913

Interregnum

/ĭnˌ-tẽrr-ĕg'-nəm/ · In·ter·reg·num · IPA /ˌɪntəɹˈɹɛɡnəm/
01 n. The time during which a throne is vacant between the death or abdication of a sovereign and the accession of his successor.
pl. Interregnums ((#))
  1. 1.
    The time during which a throne is vacant between the death or abdication of a sovereign and the accession of his successor.
  2. 2.
    Any period during which, for any cause, the executive branch of a government is suspended or interrupted.