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

See also: unaccompanied

Encyclopedia: A cappella