noun ex·tem·po·ri·za·tion \ik-ˌstem-pə-rə-ˈzā-shən\

Definition of extemporization

  1. 1 :  the act of extemporizing :  improvisation

  2. 2 :  something extemporized

Circa 1860

First Known Use of extemporization

circa 1860

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