Here's a breakdown:
* Inter- means "between"
* Regnum is derived from Latin and means "reign"
Therefore, interregnum literally means "between reigns."
Examples:
* The Roman Republic experienced several interregnums during periods of political instability.
* After the death of the king, the country was plunged into a long interregnum.
* The interregnum following the revolution saw widespread chaos and disorder.
In essence, interregnum signifies a period of time where there's a void in leadership or a transition between rulers.