—n. 1. an act or an instance of warranting; assurance; authorization; warrant.
2. Law. a. a stipulation, explicit or implied, in assurance of some particular in connection with a contract, as of sale: an express warranty of the quality of goods. b. Also called covenant of warranty. a covenant in a deed to land by which the party conveying assures the grantee that he or she will enjoy the premises free from interference by any person claiming under a superior title. Cf. quitclaim deed, warranty deed. c. (in the law of insurance) a statement or promise, made by the party insured, and included as an essential part of the contract, falsity or nonfulfillment of which renders the policy void.
d. a judicial document, as a warrant or writ.
3. a written guarantee given to the purchaser of a new appliance, automobile, or other item by the manufacturer or dealer, usually specifying that the manufacturer will make any repairs or replace defective parts free of charge for a stated period of time.
—v.t. to provide a manufacturer's or dealer's warranty for: The automaker warranties its new cars against exterior rust.