EXTEMPORIZATION

extemporization, extemporisation, improvisation

(noun) a performance given extempore without planning or preparation

Source: WordNet® 3.1

Noun

extemporization (countable and uncountable, plural extemporizations)

The act of extemporizing; the act of doing anything extempore.

Source: Wiktionary

Ex*tem`po*ri*za"tion, n.

Definition: The act of extemporizing; the act of doing anything extempore.

Source: Webster’s Unabridged Dictionary 1913 Edition