[al.to] n, pl altos [It, lit., high, fr. L altus] (ca. 1724) 1 a: countertenor b: contralto
2: the second highest voice part in a 4-part chorus
3: a member of a family of instruments having a range lower than that of the treble or soprano; esp: an alto saxophone
[2]alto adj (ca. 1724): relating to or having the range or part of an alto