diarchy

from WordNet (r) 3.0 (2006)
diarchy
    n 1: a form of government having two joint rulers [syn:
         {diarchy}, {dyarchy}]
from The Collaborative International Dictionary of English v.0.48
Diarchy \Di"arch*y\, n. [Gr. di- = di`s- twice + ? to rule.]
   A form of government in which the supreme power is vested in
   two persons. Diarial
antiflux / dictionary / diarchy
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