[In form mod.L., f. TRI- + L. dominium lordship, rule, DOMINION.] The joint rule of three powers or states: applied to that of Gt. Britain, Germany, and United States in Samoa.
1899. Westm. Gaz., 1 March, 2/3. Herr von Bülow … is reported to have said with regard to Samoa that the Tri-dominium had failed.
1900. Edin. Rev., April, 499. The break up of the unworkable tridominium … has been satisfactory to all parties.
