extemporaneity

noun
ex·​tem·​po·​ra·​ne·​i·​ty | \(ˌ)ek-ˌstem-pə-rə-ˈnē-ə-tē, -ˈnā-\

Definition of extemporaneity 

: the quality or state of being extemporaneous

First Known Use of extemporaneity

1937, in the meaning defined above

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The first known use of extemporaneity was in 1937

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