Pronunciation: (in"tur-reg'num),[key] —n., —pl.-nums, -naPronunciation: (-nu).[key] 1. an interval of time between the close of a sovereign's reign and the accession of his or her normal or legitimate successor.
2. any period during which a state has no ruler or only a temporary executive.
3. any period of freedom from the usual authority.
4. any pause or interruption in continuity.