Etymology

extemporize

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Today it means: To perform or speak without prior planning or thought; to act in an impromptu manner; to improvise. Full definition →

English extempore ← Latin ex tempore
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The story

  1. Latinex tempore
  2. Englishextempore
  3. English todayextemporize

From extempore + -ize.

Etymology from Wiktionary, CC BY-SA 4.0.