A mark or seal of approval that gives something prestige or special status; an official stamp or distinguishing feature that shows quality or authenticity.
From French cachet (seal, stamp), derived from Middle French cacher (to press, seal), ultimately from Latin coactus (pressed). Originally a literal seal on documents.
Cachet proves that prestige is literally about having the right stamp on you—royal seals made documents official, and centuries later the word still means 'that mark of approval that makes you special'!
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