WordReference Random House Learner's Dictionary of American English © 2019
a cap•pel•la /ˌɑ kəˈpɛlə/USA pronunciation   adv., adj. 
  1. Music. without instrumental accompaniment.

WordReference Random House Unabridged Dictionary of American English © 2019
a cap•pel•la  (ä′ kə pelə; It. ä′ käp pellä),USA pronunciation [Music.]
  1. without instrumental accompaniment.
  2. in the style of church or chapel music.
  • Italian: in the manner of a chapel (choir)
  • 1875–80

Collins Concise English Dictionary © HarperCollins Publishers::
a cappella /ɑː kəˈpɛlə/ adj , adv
  1. without instrumental accompaniment
Etymology: Italian: literally, according to (the style of the) chapel

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