extemporisation

/ɪkˌstɛmpərəˈzeɪʃən/
noun
  1. The act of speaking or performing without preparation or rehearsal.
    • Her extemporisation during the debate impressed the audience.
    • The comedian's extemporisation made the show feel fresh and spontaneous.
    • Good extemporisation requires quick thinking and confidence.
  2. Something that is improvised or created on the spot.
    • His speech was an extemporisation, not a prepared address.
    • The chef's extemporisation with leftover ingredients turned into a delicious meal.
    • The jazz solo was a brilliant extemporisation on the main theme.
Antonyms
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