n. In dancing, a rapid whirling on one leg or on the points of the toes, as performed by ballet-dancers.n. In the manège, a quick, short turn or whirl of a horse.To perform a pirouette; turn or whirl on one leg, or on the toes, as in dancing; advance or move along in a series of pirouettes, or short graceful turns, as a horse.n. In old reed-instruments of the oboe class, the globular cup or bowl in which the reed was inclosed and which served as a kind of mouthpiece.