"alto" in the noun sense

1. alto

a singer whose voice lies in the alto clef

2. contralto, alto

the lowest female singing voice

3. countertenor, alto

the highest adult male singing voice

4. alto

of a musical instrument) the second highest instrument in a family of musical instruments

5. alto

the pitch range of the lowest female voice

"alto" in the adjective sense

1. alto, contralto

of or being the lowest female voice

2. countertenor, alto

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

3. alto

of a musical instrument) second highest member of a group

"alto clarinet or recorder"

Source: WordNet® (An amazing lexical database of English)

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