noun A document issued by a legal or government official authorizing the police or another body to make an arrest, search premises, or carry out some other action relating to the administration of justice. (magistrates issued a warrant for his arrest) Justification or authority for an action, belief, or feeling. (there is no warrant for this assumption) An official certificate of appointment issued to an officer of lower rank than a commissioned officer.
verb Justify or necessitate (a course of action) (the employees feel that industrial action is warranted) Officially affirm or guarantee. (the vendor warrants the accuracy of the report)