Definition of messa di voce in English:

messa di voce

Pronunciation /ˌmɛsə dɪ ˈvəʊtʃeɪ/

noun

Music
  • A gradual crescendo and diminuendo on a sustained note, especially in singing.

Origin

Late 19th century; earliest use found in John Stainer (1840–1901), musicologist and composer. From Italian messa di voce placing of the voice from messa action of placing, noun derived from messo, past participle of mettere to place, put (from classical Latin mittere to send) + di of + voce voice.