A small opening or wicket through which business is conducted, like a ticket window or service counter in a bank or post office.
From Middle French guichet, meaning a small gate or opening, possibly derived from Old French guiche; the word entered English through French, maintaining its original sense of a controlled access point.
Guichets were architectural innovations in medieval fortifications—small openings that allowed defenders to target attackers while staying protected, which is why the term evolved to mean any small service window.
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