Alto (proper noun) /ˈæl.toʊ/
1
A census-designated place in Marin County, California, United States.
2
(aerospace) initialism of air launch to orbit.
alto (noun) /ˈæl.toʊ/
1
A musical part or section higher than tenor and lower than soprano, formerly the part that performed a countermelody above the tenor or main melody.
2
A person or musical instrument that performs the alto part.
3
(colloquial, music) An alto saxophone