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Definition of alto
alto - adj. (of a musical instrument) second highest member of a group; of or being the lowest female voice; of or being the highest male voice; having a range above that of tenor; noun the pitch range of the lowest female voice; (of a musical instrument) the second highest instrument in a family of musical instruments; a singer whose voice lies in the alto clef; the highest adult male singing voice; the lowest female singing voice.
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