An absolute ruler; a sovereign unrestrained by law or constitution; a usurper of sovereignty.
Specifically, a monarch, or other ruler or master, who uses power to oppress his subjects; a person who exercises unlawful authority, or lawful authority in an unlawful manner; one who by taxation, injustice, or cruel punishment, or the demand of unreasonable services, imposes burdens and hardships on those under his control, which law and humanity do not authorize, or which the purposes of government do not require; a cruel master; an oppressor.
Any one of numerous species of American clamatorial birds belonging to the family Tyrannidae; -- called also tyrant bird.
To act like a tyrant; to play the tyrant; to tyrannical.
Rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law' because law is often but the tyrant's will, and always so when it violates the rights of the individual. Thomas Jefferson
Perhaps the fact that we have seen millions voting themselves into complete dependence on a tyrant has made our generation understand that to choose one's government is not necessarily to secure freedom. Friedrich August von Hayek
tyrant in Dutch is dwingeland, geweldenaar, tiran
tyrant in French is tyran
tyrant in German is Tyrann
tyrant in Italian is tiranno
tyrant in Latin is tyrannus
tyrant in Spanish is tirano
tyrant in Swedish is tyrann