I. al ‧ to 1 /ˈæltəʊ $ -toʊ/ BrE AmE adjective
an alto instrument or voice produces notes at the second highest level, below a ↑ soprano :
an alto sax
II. alto 2 BrE AmE noun ( plural altos )
[ Date: 1500-1600 ; Language: Italian ; Origin: 'high' , from Latin altus ; ⇨ ↑ altitude ]
1 . [countable] a singing voice that is lower than a ↑ soprano , or a singer with a voice like this
2 . [singular] the part of a musical work that is written for an alto voice or instrument
⇨ ↑ baritone 1 (2), ↑ bass 1 (2), ↑ soprano 1 (2), ↑ tenor 1 (2)