improvisation

Etymology

From French improvisation. Morphologically improvise + -ation

noun

1. The act or art of composing and making music, poetry, and the like, extemporaneously
   He played a quick improvisation on the keyboard.
2. That which is improvised; an impromptu.
3. Musical technique, characteristic of blues music.
4. The act of improvising, acting or going about something without planning ahead
   The Ivorian is a player with such a liking for improvisation it does not usually look like he has any more idea than anyone else what he is going to do next, so it was an interesting choice. September 15, 2012, Amy Lawrence, “Arsenal's Gervinho enjoys the joy of six against lowly Southampton”, in the Guardian