Legal Definition of Perjury: False testimony; the telling of an untruth when acting as a witness in a court proceeding; the making of a false statement in an affidavit; the willful swearing to a falsehood in a matter before a court. Perjury occurs when someone has taken an oath to tell the truth and then knowingly tells an untruth; lying under oath. Perjury is punishable by severe fines and/or imprisonment | Learn the legal definition of perjury and its implications. Find out what constitutes perjury with real examples and understand the importance of providing truthful information in court proceedings. Discover the severe consequences of perjury and why it is considered a felony offense. Consult with an attorney to ensure you protect your interests and maintain your integrity