The act of stamping or impressing a design or mark onto something, especially an official seal or impression on documents or mail.
From French 'cacheter' (to seal), derived from 'cachet' meaning seal or mark. The word comes from Old French 'cacher' (to hide or press), ultimately from Latin 'coactus' (pressed together). The meaning evolved from the physical act of pressing a seal into wax to any kind of official marking or impression.
Postal workers and document authenticators have used cacheting for centuries to prove something is official—it's essentially the ancestor of modern security features like watermarks and holographic seals that protect everything from passports to concert tickets.
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