Definitions for "Concerto"
A composition (usually in symphonic form with three movements) in which one instrument (or two or three) stands out in bold relief against the orchestra, or accompaniment, so as to display its qualities or the performer's skill.
an instrumental composition featuring alternating passages between the orchestra and the solo instrument (solo concerto) or small group of instruments (concerto grosso).
A concerto is an instrumental work that alternates between an orchestra and a smaller group of instruments, or a solo instrument. This musical form showed virtuosity, especially in the cadenza section, in which the solo instrument ornaments the final cadence.