Etymology
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extempore (adv.)

1550s, from Latin phrase ex tempore "offhand, in accordance with (the needs of) the moment," literally "out of time," from ex "out of" (see ex-) + tempore, ablative of tempus (genitive temporis) "time" (see temporal). Of speaking, strictly "without preparation, without time to prepare," but now often with a sense merely of "without notes or a teleprompter." As an adjective and noun from 1630s.

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Definitions of extempore
1
extempore (adv.)
without prior preparation;
Synonyms: extemporaneously / extemporarily
2
extempore (adj.)
with little or no preparation or forethought;
an extempore skit
Synonyms: ad-lib / extemporaneous / extemporary / impromptu / offhand / offhanded / off-the-cuff / unrehearsed
From wordnet.princeton.edu