There is no universally accepted definition of terrorism (the term is disputed). One
2003 study by the U.S. Army stated that there are over 100 definitions for terrorism.
One who carries out acts of terrorism is a terrorist, though which acts those are is also debatable.
Individuals in the Bush Administration have drawn parallels between a national teacher organisation
NEA and women's group's that advocate prochoice as being terrorist organisations
Karen Hughes .
U.S. Code of Federal Regulations states
the unlawful use of force and 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
(28 C.F.R. Section 0.85)
In the current U.S. national security strategy:
premeditated, politically motivated violence against innocents.
According to the U.S. Defense Department: the
calculated use of unlawful violence to inculcate fear; intended to coerce or intimidate governments or societies in pursuit of goals that are generally political, religious, or ideological.
Terrorism Act 2000 Is an Act to make provision about terrorism; and to make temporary provision for Northern Ireland about the prosecution and punishment of certain offences, the preservation of peace and the maintenance of order."
It supersedes and repeals the Prevention of Terrorism (Temporary Provisions) Act 1989 and the Northern Ireland (Emergency Provisions) Act 1996.
section 1. - 1) In this Act "terrorism" means the use or threat of action where-
(a) the action falls within subsection (2),
(b) the use or threat is designed to influence the government or to intimidate the public or a section of the public, and
(c) the use or threat is made for the purpose of advancing a political, religious or ideological cause.
(2) Action falls within this subsection if it-
(a) involves serious violence against a person,
(b) involves serious damage to property,
(c) endangers a person's life, other than that of the person committing the action,
(d) creates a serious risk to the health or safety of the public or a section of the public, or
(e) is designed seriously to interfere with or seriously to disrupt an electronic system.
Section 1 goes on to give the Act worldwide scope:
an "action" can be anywhere in the world,
"the government" is that of any country, not just the UK, and
"the public" is the public of any country.