According to the American Heritage Dictionary:
Torture:
Infliction of severe physical pain as a means of punishment or coercion.
An instrument or a method for inflicting such pain.
Excruciating physical or mental pain; agony: the torture of waiting in suspense.
Something causing severe pain or anguish
According to International Law:
International Covenant on Civil and Political Rights, 1966
Article 7
No one shall be subjected to torture or to cruel, inhuman or degrading treatment or punishment. In particular, no one shall be subjected without his free consent to medical or scientific experimentation.
Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment, 1984
Article 1
For the purposes of this Convention, the term "torture" means any act by which severe pain or suffering, whether physical or mental, is intentionally inflicted on a person for such purposes as obtaining from him or a third person information or a confession, punishing him for an act he or a third person has committed or is suspected of having committed, or intimidating or coercing him or a third person, or for any reason based on discrimination of any kind, when such pain or suffering is inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity. It does not include pain or suffering arising only from, inherent in or incidental to lawful sanctions.
Crime against humanity of torture
Elements
The perpetrator inflicted severe physical or mental pain or suffering upon one or more persons.
Such person or persons were in the custody or under the control of the perpetrator.
Such pain or suffering did not arise only from, and was not inherent in or incidental to, lawful sanctions.
The conduct was committed as part of a widespread or systematic attack directed against a civilian population.
The perpetrator knew that the conduct was part of or intended the conduct to be part of a widespread or systematic attack directed against a civilian population.
2. For the purpose of paragraph 1:
(e) "Torture" means the intentional infliction of severe pain or suffering, whether physical or mental, upon a person in the custody or under the control of the accused; except that torture shall not include pain or suffering arising only from, inherent in or incidental to, lawful sanctions;
Article 8 (2) (a) (ii)-2
War crime of inhuman treatment
Elements
The perpetrator inflicted severe physical or mental pain or suffering upon one or more persons.
Such person or persons were protected under one or more of the Geneva Conventions of 1949.
The perpetrator was aware of the factual circumstances that established that protected status.
The conduct took place in the context of and was associated with an international armed conflict.
The perpetrator was aware of factual circumstances that established the existence of an armed conflict.
Geneva Convention: (You have to read it to see all the violations we are committing):
http://www.us-israel.org/jsource/History/Human_Rights/geneva1.html