Meaning of “extemporaneous” in the English Dictionary

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"extemporaneous" in American English

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extemporaneousadjective

us /ɪkˌstem·pəˈreɪ·ni·əs/

done or said without preparation:

He made some extemporaneous remarks before the award ceremony.

(Definition of “extemporaneous” from the Cambridge Academic Content Dictionary © Cambridge University Press)