n. An absolute ruler; one who governs according to his own will, under a recognized right or custom, but uncontrolled by constitutional restrictions or the wishes of his subjects; a sovereign who is himself theoretically the source of all law.n. n. A tyrant; an oppressor; one who or a body which exercises lawful power tyrannically or oppressively, as either sovereign or master.n. An honorary title of the Byzantine emperors, afterward of members of their families, and then conferred as a title of office on vassal rulers and governors: as, the despots of Epirus.n. Synonyms Autocrat, dictator.