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Perjury is an assertion of fact or knowledge by a person under oath when that person knows, or is of the opinion, that what he is swearing to is false. Testifying that you witnessed a certain individual commit crime, when you did not really witness it, is perjury. However, the falsehood or lie must be material, so that testifying that you witnessed a crime when you were sitting on a bench rather than standing on a sidewalk is not necessarily perjury.
Perjury does not have to be spoken-it can also be committed in writing. For example, when you sign your tax return, you are swearing to its truthfulness, under consequence of perjury.