1. A mark or quality, as of distinction, individuality, or authenticity: “Federal courts have a certain cachet which state courts lack”Christian Science Monitor.
2. A seal on a document, such as a letter.
3.
a. A commemorative design stamped on an envelope to mark a postal or philatelic event.
b. A motto forming part of a postal cancellation.
4. A kind of wafer capsule formerly used by pharmacists for presenting an unpleasant-tasting drug.
[French, from Old French, from cacher, to press; see cache.]
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