Letterhead printed at the top of stationery; the decorative heading on official correspondence.
From French 'entête,' literally 'at the head,' combining 'en' (at) and 'tête' (head). French printing tradition adopted this term for the decorated top portion of letters.
Fancy stationery with elaborate designs at the top? That's an entête—and during the 18th-century European letter-writing era, how ornate your entête was basically advertised your social status!
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