extemporization
nounUK /ɪkˌstɛmpəraɪˈzeɪʃən/
US /ɪkˌstɛmpərɪˈzeɪʃən/
The act of making something up on the spot without planning.
Her speech was pure extemporization, since she had forgotten her notes at home.
OTHER MEANINGS
2. The performance of music that is created in the moment rather than played from a score.
The jazz pianist's extemporization delighted the audience.
3. The act of speaking without prepared text or notes.
His extemporization at the meeting impressed everyone with its clarity.
4. The creation of a makeshift solution using whatever is available.
The extemporization of a shelter from branches kept them dry through the night.