Etymology
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extemporize (v.)

1640s (implied in extemporizing), "to speak ex tempore," from extempore + -ize. Related: Extemporized.

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Definitions of extemporize

extemporize (v.)
manage in a makeshift way; do with whatever is at hand;
Synonyms: improvise
extemporize (v.)
perform without preparation;
he extemporized a speech at the wedding
Synonyms: improvise / improvize / ad-lib / extemporise
From wordnet.princeton.edu