7. (adj)countertenor, alto of or being the highest male voice; having a rangeabove that of tenor
8. (adj)alto (of a musical instrument) second highest member of a group "alto clarinet or recorder"
Definitions of 'ALTO'
Webster 1913 Dictionary
1. (noun)ALTO formerly the partsung by the highest male, or counter-tenor, voices; now the partsung by the lowest female, or contralto, voices, between in tenor and soprano. In instrumental music it now signifies the tenor