Improvisational means belonging to a style where the players invent as they go. An improvisational style, improvisational theatre, improvisational jazz.
The rule in improvised theatre is to accept whatever another player offers and add to it, which is what stops a scene collapsing. It looks like the absence of preparation and is in fact a trained discipline.
1adjectiveimprovisationalBelonging to a style of performing in which the players invent the material as they go.
“The band's improvisational style means that no two concerts are ever the same.”
improvisational is a quality.
From improvisation, from Italian improvvisare, from Latin improvisus, unforeseen.
French
improvisation
English
improvisation
English, today
improvisational
by surface analysis, improvisation + -al, or, by surface analysis, improvise + -ation + -al. improvisation comes from French improvisation. Morphologically improvise + ation.
Etymology from Wiktionary, CC BY-SA