tridominium

tridominium

(ˌtraɪdəˈmɪnɪəm)
n
(Government, Politics & Diplomacy) the shared rule of three states
References in periodicals archive ?
The Upper Lake is considered a tridominium shared by Austria, Germany and Switzerland.
The main body of the Upper Lake remains factually a diplomatically disputed tridominium of the neighbouring countries, Austria, Germany and Switzerland.