IPA: /ˌɪn.təˈrɛɡ.nəm/
KK: /ɪnˈtɛrɛɡnəm/
A time when there is no ruler or government in place, often between two leaders or regimes.
The country experienced an interregnum after the king's death and before the new ruler was crowned.
Interregnum → It is formed from "inter-" (meaning between) and "regnum" (meaning reign or rule). The term describes a period between reigns or rulers, specifically when a throne is vacant.
Think of a time that is 'between' ('inter-') two 'rules' ('regnum') — that's what interregnum means.