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

an extradition warrant

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

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