Merriam-Webster Collegiate Dictionary - cachet

 noun  Etymology: French, from cacher  Date: circa 1639  1.  a. a seal used especially as a mark of official approval  b. an indication of approval carrying great prestige  2.  a. a characteristic feature or quality conferring prestige  b. prestige being rich…doesn't have the ~ it used to — Truman Capote  3. a medicinal preparation for swallowing consisting of a case usually of rice-flour paste enclosing a medicine  4.  a. a design or inscription on an envelope to commemorate a postal or philatelic event  b. an advertisement forming part of a postage meter impression  c. a motto or slogan included in a postal cancellation