1. The time between the end of one reign and the beginning of the next one: In the adventure story, the rebel tried to gain power in the country's interregnum.
2. A period of time during which there is no government, control, or authority: There was an interregnum, or a time of temporary suspension of government control, when the citizens enjoyed the life of being free to do whatever they wanted to do!
3. A gap in an ongoing activity; interval: An interregnum is the interruption or a pause in any kind of continuous pursuit.