Extemporization
/ɪkˌstempərəˈzeɪʃn/
Definition 1 of 1
Pro Tip 1/3Performance Pressure
Used to express someone's ability to perform under pressure without prior preparation. 
His extemporization was impressive given the unexpected questions he faced during the interview.
Pro Tip 2/3Creativity Highlight
Shows a person's creativity by using their skills to create or respond on the spot. 
The jazz band's extemporization brought a unique flavor to each performance.
Pro Tip 3/3Unscripted Moments
Indicates instances where dialogues or actions are not pre-planned but naturally occurring. 
Her extemporization during the presentation added a personal touch that captivated the audience.