mezza vocePronunciation: /ˌmɛtsə ˈvəʊtʃeɪ, ˈvɒtʃi/ MusicDefinition of mezza voce adverb & adjective (especially as a direction) using about half the singer’s vocal power. noun [mass noun] singing performed mezza voce: the sweet mezza voce of the ‘Hostias’Origin:Italian, literally 'half voice'mezza voce in other Oxford dictionaries Definition of mezza voce in the US English dictionary