Terrorism is, in the broadest sense, the use of intentionally indiscriminate violence as a means to create terror among masses of people; or fear to achieve a religious or political aim. It is used in this regard primarily to refer to violence during peacetime or in war against non-combatants. The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but gained mainstream popularity during the U.S. presidency of Ronald Reagan (1981–89) after the 1983 Beirut barracks bombings and again after the 2001 September 11 attacks and the 2002 Bali bombings.
There is no commonly accepted definition of "terrorism". Being a charged term, with the connotation of something "morally wrong", it is often used, both by governments and non-state groups, to abuse or denounce opposing groups. Broad categories of political organisations have been claimed to have been involved in terrorism to further their objectives, including right-wing and left-wing political organisations, nationalist groups, religious groups, revolutionaries and ruling governments. Terrorism-related legislation has been adopted in various states, regarding "terrorism" as a crime. There is no universal agreement as to whether or not "terrorism", in some definition, should be regarded as a war crime.
According to the Global Terrorism Database maintained by the University of Maryland, College Park, more than 61,000 incidents of non-state terrorism, resulting in at least 140,000 deaths, were recorded between 2000 and 2014.
Etmologically, the word terror is derived from the Latin verb Tersere, which later becomes Terrere. The latter form appears in European languages as early as the 12th century; its first known use in French is the word terrible in 1160. By 1356 the word terreur is in use. Terreur is the origin of the Middle English term terrour, which later becomes the modern word "terror".
There are over 109 different definitions of terrorism. American political philosopher Michael Walzer in 2002 wrote: "Terrorism is the deliberate killing of innocent people, at random, to spread fear through a whole population and force the hand of its political leaders". Bruce Hoffman, an American scholar, has noted that
It is not only individual agencies within the same governmental apparatus that cannot agree on a single definition of terrorism. Experts and other long-established scholars in the field are equally incapable of reaching a consensus.
C.A.J. Coady has written that the question of how to define terrorism is "irresolvable" because "its natural home is in polemical, ideological and propagandist contexts".
French historian Sophie Wahnich distinguishes between the revolutionary terror of the French Revolution and the terrorists of the September 11 attacks:
Revolutionary terror is not terrorism. To make a moral equivalence between the Revolution's year II and September 2001 is historical and philosophical nonsense ... The violence exercised on 11 September 2001 aimed neither at equality nor liberty. Nor did the preventive war announced by the president of the United States.
Experts disagree about "whether terrorism is wrong by definition or just wrong as a matter of fact; they disagree about whether terrorism should be defined in terms of its aims, or its methods, or both, or neither; they disagree about whether or not states can perpetrate terrorism; they even disagree about the importance or otherwise of terror for a definition of terrorism."
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