Etymology

impromptu

im·promp·tu
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Today it means: Improvised; without prior preparation, planning, or rehearsal. Full definition →

French impromptu ← Latin in prōmptū
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The story

  1. Latinin prōmptū
  2. Frenchimpromptu
  3. English todayimpromptu

Unadapted borrowing from French impromptu.

Etymology from Wiktionary, CC BY-SA 4.0.