Etymology
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cachet (n.)

1630s, "a seal," Scottish borrowing of French cachet "seal affixed to a letter or document" (16c.), from Old French dialectal cacher "to press, crowd," from Latin coactare "constrain" (see cache). Meaning evolved 18c. (via French lettre de cachet "letter under seal of the king") to "(letter under) personal stamp (of the king)," thence to "symbol of prestige" (1840).

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Definitions of cachet

cachet (n.)
an indication of approved or superior status;
Synonyms: seal / seal of approval
cachet (n.)
a warrant formerly issued by a French king who could warrant imprisonment or death in a signed letter under his seal;
Synonyms: lettre de cachet
cachet (n.)
a seal on a letter;
From wordnet.princeton.edu