DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   cachet
       n 1: an indication of approved or superior status [syn:
            cachet, seal, seal of approval]
       2: a warrant formerly issued by a French king who could warrant
          imprisonment or death in a signed letter under his seal [syn:
          cachet, lettre de cachet]
       3: a seal on a letter