Joint rule or government by two or more individuals or parties.
- ‘Under synarchy, growth-based economics will cease to be the basis for planetary management.’
- ‘By the turn of the century, the royalist faction came to fear synarchy, whose influence had spread beyond esoteric groups.’
- ‘This resulted in a system of synarchy, a system of joint administration by British officials and local elites.’
Mid 18th century: from Greek sunarkhia, from sunarkhein rule jointly.