Interestingly, Wikipedia terrorism
Definitions include:
"the deliberate killing of innocent people, at random, to spread fear through a whole population and force the hand of its political leaders" (Michael Walzer, 2002).
"the organized use of violence to attack non-combatants ('innocents' in a special sense) or their property for political purposes" (C. A. J. Coady, 2004).
"the deliberate use of violence, or threat of its use, against innocent people, with the aim of intimidating some other people into a course of action they otherwise would not take" (Igor Primoratz, 2004)
."the use of force or violence or the threat of force or violence to change the behavior of society as a whole through the causation of fear and the targeting of specific parts of society in order to affect the entire society" (Arthur H. Garrison, 2004).
"The premeditated use or threat to use violence by individuals or subnational groups to obtain a political or social objective through the intimidation of a large audience beyond that of the immediate victims" (Todd Sandler, 2010).
