warrant warrant /ˈwɔrənt/

noun

1. () (law) a writ from a court commanding police to perform specified acts  ( warrant )
   (law) a writ from a court commanding police to perform specified acts
    The police obtained a warrant to search the suspect's home
   The police obtained a warrant to search the suspect's home
   
2. A written assurance that some product or service will be provided or will meet certain specifications  ( warrant , warrantee , warranty , guarantee )
   a written assurance that some product or service will be provided or will meet certain specifications
   
3. Formal and explicit approval  ( endorsement , indorsement , warrant , countenance , imprimatur , sanction )
   formal and explicit approval
    A Democrat usually gets the union's endorsement
   a Democrat usually gets the union's endorsement
   
4. A type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price  ( stock warrant , stock-purchase warrant , warrant )
   a type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price
    As a sweetener they offered warrants along with the fixed-income securities
   as a sweetener they offered warrants along with the fixed-income securities
   

verb

1. () Provide adequate grounds to justify (a certain course of action)  ( warrant )
   provide adequate grounds to justify (a certain course of action)
    The emergency does not warrant all of us buying guns
   The emergency does not warrant all of us buying guns
   
2. Stand behind and guarantee the quality, accuracy, or condition of  ( warrant , guarantee )
   stand behind and guarantee the quality, accuracy, or condition of
    The dealer warrants all the cars he sells
   The dealer warrants all the cars he sells
    I warrant this information
   I warrant this information