BLACK'S LAW DICTIONARY, 7TH EDITION
To tell an untruth; to speak or write falsely.
To act or an instance of a person's deliberately making material false or misleading statements at trial.
Prior inconsistent statments
A witness's earlier statement that conflicts with the witness's testimony at trial.
Impeachment of Witness
To discredit the veracity of a witness
An untrue statement knowingly made with the intent to mislead.
Testimony that is untrue. This term is broader than perjury, which has a state-of-mind element. Unlike perjury, false testimony does not denote a crime.