terrorist /ˈtɛɹəɹɪst/noun 2adjective 1forms 1 noun2 •a person or a group that uses violence and fear against people in order to reach political goals •(historical) An agent or partisan of the revolutionary tribunal during the Reign of Terror in France. adjective1 •Of or relating to terrorism.States like these, and their terrorist allies, constitute an axis of evil, arming to threaten the peace of the world. — 2002 formsterrorists