1a written guarantee, issued to the purchaser of an article by its manufacturer, promising to repair or replace it if necessary within a specified period of time:the car comes with a three-year warranty [mass noun]:as your machine is under warranty, I suggest getting it checked
(in an insurance contract) an engagement by the insured party that certain statements are true or that certain conditions shall be fulfilled, the breach of which will invalidate the policy.
2 [mass noun, usually with negative] archaic justification or grounds for an action or belief:you have no warranty for such an audacious doctrine
