01 n. Formerly the part sung by the highest male, or counter-tenor, voices; now the part sung by the lowest female, or contralto, voices, between…
pl.
Altos
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1.
Formerly the part sung by the highest male, or counter-tenor, voices; now the part sung by the lowest female, or contralto, voices, between in tenor and soprano. In instrumental music it now signifies the tenor.(Mus.)
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2.
An alto singer.
Phrases & compounds
Alto clef —
the counter-tenor clef, or the C clef, placed so that the two strokes include the middle line of the staff.