monarchy -
A government with a hereditary head of state whether as a figurehead or as a powerful ruler.
Wikipedia
A monarchy is a form of government in which all political power is absolutely or nominally lodged with an individual, known as a monarch ("single ruler"), or king (male), queen (female). As a political entity, the monarch is the head of state, generally until their death or abdication, and "is wholly set apart from all other members of the state. " Historically, the notion of monarchy may emerge under different circumstances.
OmegaWiki Dictionary
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monarchy A government with a hereditary head of state.