Terrorism/ˈterərɪzəm/ Definition 1 of 3Pro Tip 1/3Fear Element Terrorism is often associated with creating a psychological impact beyond the act itself. The terrorism alert caused widespread panic. Pro Tip 2/3Not Just Physical Threats of violence can be considered terrorism even if no actions occur. The threatening letters were deemed as terrorism. Pro Tip 3/3Group Activity Terrorism usually implies coordinated efforts by a group, not individual acts. The organization was plotting acts of terrorism.