warrant

noun

• 1a document issued by a legal or government official authorizing the police or some other 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
• a document that entitles the holder to receive goods, money, or services:we’ll issue you with a travel warrant
• Finance a negotiable security allowing the holder to buy shares at a specified price at or before some future date.
• [usually with negative] justification or authority for an action, belief, or feeling:there is no warrant for this assumption

• 2an official certificate of appointment issued to an officer of lower rank than a commissioned officer.

verb

• justify or necessitate (a certain course of action):that offense is serious enough to warrant a court marshal
• officially affirm or guarantee:the vendor warrants the accuracy of the report