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/əkˈstɛmpəɹaɪz/ · verb
(intransitive) To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise..
Use extemporise when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Extemporise means (intransitive) To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise..
Common synonyms include improvise, extemporize, ad-lib.
The opposite depends on the specific sense.
Use extemporise where its definition matches the intended context.
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