Without previous study or meditation; without preparation; on the spur of the moment; suddenly; extemporaneously; as, to write or speak extempore.,
Done or performed extempore.,
Speaking or writing done extempore.
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Extempore speaking is the term used for a non-formally prepared
speech.
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Extempore speech is talking with little or no preparation or forethought. Lecture means a prepared speech giving information.