A voice, instrument, or part below the highest range and above tenor, typically the second highest part in choral music. The choir's alto section harmonized beautifully with the sopranos.
A person having a voice in the alto range, especially a female singer. She was chosen as the lead alto for the upcoming concert.
An instrument, such as an alto saxophone, that is pitched in the alto range. He played a solo on his alto saxophone during the jazz performance.