Any premeditated, unlawful act dangerous to human life or public welfare that is intended to intimidate or coerce civilian populations or governments. 

The use of violence to produce terror for political or ideological purposes. Terrorism is distinct from war in that it need not be the act of a military force or be directed by a sovereign power. Fo [..]

1795, in specific sense of "government intimidation during the Reign of Terror in France" (March 1793-July 1794), from French terrorisme, from Latin terror (see terror). If the basis of a po [..]

use of violence and threats of violence to influence political decisions.

the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coe [..]

An act by any person or group, including the use of or threat to use force or violence for political, religious, ideological, ethnic or similar purposes (including the purpose of influencing the gover [..]

An act by any person or group, including the use of or threat to use force or violence for political, religious, ideological, ethnic or similar purposes (including the purpose of influencing the gover [..]

War Geopolitical Religious (primarily Islamic) Homeland Security Disaster Recovery Miscellaneous Sources

The use and threat of violence for political purposes.

The use of extreme violence or the threat of violence by states, groups or individuals to generate fear in individuals and thus manipulate their behavior. Currently, most terrorism is either drug or r [..]

The use of violence or the threat of violence to achieve political, social, or economic ends. Many would restrict the definition to include only those acts committed by non-government groups, but state terrorism is also a major factor in the social world.

noun. step-by-step intimidation or coercion to reach political or religious goals utilizing illegal and unpredictable force or violent behavior against property, people, or governments.

Terrorismo

No one definition of terrorism has gained universal acceptance. Terrorism is defined in the Homeland Security Act of 2002 as any activity that "(A) involves an act that (i) is dangerous to human [..]

1 : the unlawful use or threat of violence esp. against the state or the public as a politically motivated means of attack or coercion 2 : violent and intimidating gang activity [street ] ...

Terms strictly limited to Al Qaeda jihadi attackers of American civilians. Jihadis who attack other countries' civilians are extremists, militants, radicals, etc.

  The use of isolated, typically random acts of violence, often carried out against  collateral or symbolic targets -- such as national embassies and airlines -- and  intended primarily to instill fea [..]

An attack on people designed to frighten society and force it to meet the terrorists' demands.

According to 6 USCS § 101, the term terrorism is "any activity that--

(n) the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or [..]

In war and conflict, the use of tactics intended to persuade the opponents, or civilians, not to resist.

Terrorism is an act or threat of action by a person or group of people, whether acting alone or in connection with an organisation or government, committed for political, religious, ideological or similar purposes intended to influence any government or to frighten the public or any section of it. An 'action' means: violence, damage to pr [..]

The use or threatened use of force or Violence against Persons or property in violation of Criminal Laws for purposes of intimidation, Coercion, or ransom, in support of political or social objectives [..]

The use of Biological Agents in Terrorism. This includes the malevolent use of Bacteria; Viruses; or other Biological Toxins against people, Animals; or Plants.

The use of chemical agents in Terrorism. This includes the malevolent use of nerve agents, Blood agents, Blister agents, and choking agents (Noxae).

Use of radioactive agents in Terrorism.

The use or threatened use of force or violence against persons or property in violation of criminal laws for purposes of intimidation, coercion, or ransom, in support of political or social objectives [..]

Fire insurance, even if extended to cover riot cover, can exclude ’terrorism’, which is normally defined as the use of violence for political ends. The term ’terrorism’ usually also includes any viole [..]

Politically motivated violence or intimidation directed against a civilian population by a subgroup within a population, by an outside group, or by clandestine agents of another country.

This article provides a comprehensive study of the economic determinants of domestic and transnational terrorism and the role that the economy plays in ...

Use of violence or intimidation to coerce a government or civilian population to further political or social objectives.

Use of violence or intimidation to coerce a government or civilian population to further political or social objectives.

Politically motivated violence or intimidation directed against a civilian population by a subgroup within a population, by an outside group, or by clandestine agents of another country.

Politically motivated violence or intimidation directed against a civilian population by a subgroup within a population, by an outside group, or by clandestine agents of another country.

is defined as the systematic or planned use of violence, fear, or threat of violence in order to intimidate a population or government, especially as a means of coercion or to obtain a granting of any [..]

Terrorism is the unlawful use of force against individuals or property to intimidate a government, the civilian population, or any segment of the population in the furtherance of political objectives.

The unlawful use or threatened use of force or violence against individuals or property to coerce or intimidate governments or societies, often to achieve political, religious, or ideological objectiv [..]