Definition of a cappella in English:

a cappella

adjective & adverb

  • (with reference to choral music) without instrumental accompaniment.

    [as adjective] ‘an a cappella Mass’
    [as adverb] ‘the trio usually performs a cappella’
    • ‘We'll prepare a few songs that we can do a cappella.’

Origin

Italian, literally in chapel style.

Pronunciation:

a cappella

/ä kəˈpelə//a kəˈpelə/