freestyle
n. C / Un. a performance where you make up the words or moves as you go along, rather than following a plan. You see this most often in rap music or swimming competitions.
n. an improvisational performance or competition, particularly in hip-hop music or various sports, where the participant creates content or movements spontaneously. In swimming, it refers to a race where any stroke may be used, though the front crawl is almost universally chosen.
The rapper finished his set with an impressive freestyle.
She won the gold medal in the 400-meter freestyle after a powerful final lap.
While some critics prefer polished studio recordings, others argue that a raw freestyle reveals a performer's true technical mastery and creative agility under pressure.
From free + style.
Used as an uncountable noun when referring to the general style or discipline; countable when referring to a specific performance or race.