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Definition

No definition of terrorism has gained universal agreement, Challenges emerge due to the politically and emotionally charged nature of the term, the double standards used in applying it, and disagreement over the nature of terrorist acts and limits of the right to self-determination. Harvard law professor Richard Baxter, a leading expert on the law of war, was a skeptic: "We have cause to regret that a legal concept of 'terrorism' was ever inflicted upon us. The term is imprecise; it is ambiguous; and above all, it serves no operative legal purpose."

Different legal systems and government agencies employ diverse definitions of terrorism, with governments showing hesitation in establishing a universally accepted, legally binding definition. Title 18 of the United States Code defines terrorism as acts that are intended to intimidate or coerce civilians or government. The international community has been slow to formulate a universally agreed, legally binding definition of this crime, and has been unable to conclude a Comprehensive Convention on International Terrorism that incorporates a single, all-encompassing, legally binding, criminal law definition of terrorism. These difficulties arise from the fact that the term "terrorism" is politically and emotionally charged. The international community has instead adopted a series of sectoral conventions that define and criminalize various types of terrorist activities.

Counterterrorism analyst Bruce Hoffman 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. In 1992, terrorism studies scholar Alex P. Schmid proposed a simple definition to the United Nations Commission on Crime Prevention and Criminal Justice (CCPCJ) as "peacetime equivalents of war crimes," but it was not accepted. In 2006, it was estimated that there were over 109 different definitions of terrorism.