Real Dictionary

warranty
A warranty is a written promise by a company that, if you find a fault in something they have sold you within a certain time, they will repair it or replace it free of charge.

warranty in American English
official authorization or sanction
noun: an act or an instance of warranting; assurance; authorization; warrant
transitive verb: to provide a manufacturer's or dealer's warranty for

warranty in British English
noun: a covenant, express or implied, by which the vendor of real property vouches for the security of the title conveyed

warranty in Retail
noun: If a warranty is offered with goods, the buyer is given a written guarantee that the manufacturer or retailer will repair or replace the goods, under certain conditions.