What is Lie?

Legal Definition
A lie is a statement that the stating party believes to be false and that is made with the intention to deceive. The practice of communicating lies is called lying, and a person who communicates a lie may be termed a liar. Lies may be employed to serve a variety of instrumental, interpersonal, or psychological functions for the individuals who use them. Generally, the term "lie" carries a negative connotation, and depending on the context a person who communicates a lie may be subject to social, legal, religious, or criminal sanctions. In certain situations, however, lying is permitted, expected, or even encouraged. Believing and acting on false information can have serious consequences. Therefore, scientists and others have attempted to develop reliable methods for distinguishing lies from true statements.
-- Wikipedia
Legal Definition
That which is proper, is fit; as, an action on the case lies for an injury committed without force; corporeal hereditaments lie in livery, that is, they pass by livery; incorporeal hereditaments lie in grant, that is, pass by the force of the grant, and without any livery. Vide Lying in grant.
-- Bouviers Law Dictionary
Legal Definition
To subsist; to exist; to be sustainable; to be proper or available. Thus .the phrase "an action will not lie" means that an action cannot be sustained, or that there is no ground upon which to found the action.
See also
-- Black's Law Dictionary
Legal Definition
To be appropriate as a remedy. See Le action bien gist.
-- Ballentine's Law Dictionary