diarchy(n = noun.group) dyarchy - a form of government having two joint rulers;
is a kind of form of government, political system
diarchy, n. (also dyarchy) (pl. -ies)
1 government by two independent authorities (esp. in India 1921-37).
2 an instance of this.
Derivative:
diarchal adj. diarchic adj.
Etymology:
DI-(1) + Gk -arkhia rule, after monarchy