Shogun \Sho"gun\, n. [Chin. tsiang ki["U]n commander in chief.] A title originally conferred by the Mikado on the military governor of the eastern provinces of Japan. By gradual usurpation of power the Shoguns (known to foreigners as Tycoons) became finally the virtual rulers of Japan. The title was abolished in 1867. [Written variously, {Shiogun}, {Shiogoon}, etc.]