Definition of "Alto" :

noun: the pitch range of the lowest female voice

noun: (of a musical instrument) the second highest instrument in a family of musical instruments

noun: the highest adult male singing voice

noun: the lowest female singing voice

noun: a singer whose voice lies in the alto clef

adjective: (of a musical instrument) second highest member of a group

"Alto clarinet or recorder."

adjective: of or being the highest male voice; having a range above that of tenor

adjective: of or being the lowest female voice