GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Cachet (?), n. [F. fr. cacher to hide.] A seal, as of a letter.
   
   [1913 Webster]
   
   Lettre de cachet [F.], a sealed letter, especially a letter or missive emanating from the sovereign; -- much used in France before the Revolution as an arbitrary order of imprisonment.
   
   [1913 Webster]