Improv (noun)

The act of performing without a script or preconceived plan; improvisation.

Origin:

Abbreviation of improvisation.

Examples:

1. The comedy troupe specializes in improv performances.
2. The actor's improv skills were put to the test in the unscripted scene.
3. The improv class helped the students to think on their feet.
4. The improvisation (improv) performance was a hit with the audience.
5. The band's improv skills were showcased during their jam sessions.