Meaning & use
diarchy
A form of government or rule in which power is shared jointly by two authorities or rulers.
See it in a sentence
Ancient Sparta operated under a diarchy, with two kings ruling side by side.
Historians debate whether the arrangement was a true diarchy or one ruler with a figurehead partner.
A note on using this word
Diarchy is a rare, mostly historical or political-science term; it is also spelled 'dyarchy'.
Words with a similar meaning
dyarchy
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