perjury

n. act of lying under oath; act of giving false testimony in a court of law

Perjury is the act of lying or making verifiably false statements on a material matter under oath or affirmation in a court of law or in any of various sworn statements in writing. Perjury is a crime because the witness has sworn to tell the truth and, for the credibility of the court, witness testimony must be relied on as being truthful. Perjury is considered a serious offense as it can be used to usurp the power of the courts, resulting in miscarriages of justice. In the United States, for example, the general perjury statute under Federal law provides for a prison sentence of up to five years, and is found at . See also .
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Noun
1. criminal offense of making false statements under oath
(synonym) bearing false witness, lying under oath
(hypernym) misdemeanor, misdemeanour, infraction, offence, offense, violation, infringement
(derivation) perjure

(v.)
False swearing.
  

(v.)
At common law, a willfully false statement in a fact material to the issue, made by a witness under oath in a competent judicial proceeding. By statute the penalties of perjury are imposed on the making of willfully false affirmations.
  

An intentional lie given while under oath or in a sworn affidavit. - (read more on Perjury)