a cappella UK /ˌæ.kəˈpɛl.ə/US /ˌɑ kəˈpɛl.ə/adjective 3adverb 2noun 1forms 2 adjective3 •Singing solely or mainly without instrumental accompaniment.An a cappella group sang during the wedding reception. •(US) 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 •(no longer used) alla breve. adverb2 •In the manner of a choir with no instrumental accompaniment.Groups of teens singing a cappella on street corners got recording contracts. •(no longer used) In alla breve time. noun1 •A vocal performance with no instrumental accompaniment. formsa cappellas · a-cappellas
