Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: Latin in promptu 'in readiness'

impromptu

 adjective
     
im‧promp‧tu
done or said without any preparation or planning
impromptu speech/party/meeting etc
The band gave an impromptu concert.
—impromptu adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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