Etymology Borrowed from Italian a cappella (“in the manner of the [Sistine] chapel”), referring to non-instrumental choirs.
1
Entertainment, Lifestyle, Music Singing solely or mainly without instrumental accompaniment.
An a cappella group sang during the wedding reception.
2
Entertainment, Lifestyle, MusicUS Related to a form of purely vocal music mostly associated with American college performance groups.
Socially, a cappella groups tend to be tight-knit ensembles in which close interpersonal relationships are formed.2012, Joshua S. Duchan, Powerful Voices, page 2: