terrorism Look up terrorism at Dictionary.com
1795, in specific sense of "government intimidation during the Reign of Terror in France" (1793-July 1794), from Fr. terrorisme (1798), from L. terror (see terror).
"If the basis of a popular government in peacetime is virtue, its basis in a time of revolution is virtue and terror -- virtue, without which terror would be barbaric; and terror, without which virtue would be impotent." [Robespierre, speech in French National Convention, 1794]
General sense of "systematic use of terror as a policy" is first recorded in English 1798.