improtivation 

One would describe improvtivation as having the motivation to improve oneself.

A success athlete may have improtivation to gain more success

improtivation by Yoman123 April 21, 2011

stoner improvisation 

When a stoner in your band improvises your music subconsciously, according to what the weed is telling his brain to do.

Hey DJ fatfingaz please cut the stoner improvisations out when you master the recording.

stoner improvisation by alex and max sure do look alike November 3, 2006

improvisation 

To make something up on the spot.

Improvisation is common in jazz music, when a musician makes up a solo spontaneously, as opposed to playing a written solo.

Sometimes a group of musicians will completely improvise an entire song. This is done almost exclusively by jazz musicians.

All forms of art can be improvised. Art that is improvised may be called "free" or "freestyle", like "free poetry".

A popular form of improvisation is rapping, or flowing.

Miles Davis was a master of improvisation.

improvisation by The Drafted's guitar player September 6, 2005

Improvation 

The act of improving things.

When we fixed the voting systems so that no one could cheat that was a serious improvation.

Improvation by spiroc January 15, 2022