Definition of extemporization noun from the Oxford Advanced Learner's Dictionary

 

extemporization

 noun
(British English also -isation)noun
BrE BrE//ɪkˌstempəraɪˈzeɪʃn//
 
; NAmE NAmE//ɪkˌstempərəˈzeɪʃn//
 
[uncountable](formal)
 
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the act of speaking or performing without preparing or practising synonym improvisation