The search for a universal, precise definition of terrorism has been challenging for researchers and practitioners alike. Different definitions exist across the federal, international and research communities.
Title 22 of the U.S. Code, Section 2656f(d) defines terrorism as “premeditated, politically motivated violence perpetrated against noncombatant targets by subnational groups or clandestine agents, usually intended to influence an audience.” 
The Federal Bureau of Investigation (FBI) defines terrorism as “the unlawful use of force or violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives.”
Both definitions of terrorism share a common theme: the use of force intended to influence or instigate a course of action that furthers a political or social goal. In most cases, NIJ researchers adopt the FBI definition, which stresses methods over motivations and is generally accepted by law enforcement communities.
Date Modified: September 13, 2011