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Adjective: a capella  ,a-ku'pe-lu
  1. Sung without instrumental accompaniment
    "they sang an a capella Mass";
    - a cappella
Adverb: a capella  ,a-ku'pe-lu
  1. Without musical accompaniment
    "they performed a capella";
    - a cappella

See also: unaccompanied

Encyclopedia: A capella