perjurer

perjurer n. a person who intentionally lies while under an oath administered by a notary public, court clerk or other official, and thus commits the crime of perjury. A perjurer may commit perjury in oral testimony or by signing or acknowledging a written legal document (such as an affidavit, declaration under penalty of perjury, deed, license application, tax return) knowing the document contains false information. (See: perjury)