warrant

warrant (http://definr.com/warrant)

     n 1: a writ from a court commanding police to perform specified
          acts
     2: formal and explicit approval [syn: sanction, countenance,
         endorsement, imprimatur]
     3: a written assurance that some product or service will be
        provided or will meet certain specifications [syn: guarantee,
         warranty]
     v 1: show to be reasonable [syn: justify]
     2: stand behind [syn: guarantee]