| alto | (adjective) (of a musical instrument) second highest member of a group | - |
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| (adjective) of or being the highest male voice; having a range above that of tenor | Synonyms: countertenor |
| (adjective) of or being the lowest female voice | Synonyms: contralto |
| (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 lowest female singing voice | Synonyms: contralto |
| (noun) the highest adult male singing voice | Synonyms: countertenor |
| (noun) a singer whose voice lies in the alto clef | - |
| contralto | (adjective) of or being the lowest female voice | Synonyms: alto |
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| (noun) the lowest female singing voice | Synonyms: alto |
| (noun) a woman singer having a contralto voice | - |