- In church or chapel style; -- said of compositions sung
in the old church style, without instrumental accompaniment; as, a mass
a capella, i. e., a mass purely vocal. - A time indication, equivalent to alla breve.
Meaning of 'a cappella' (Princeton's WordNet)
1 . a cappella
[ r]
Meaning (1): - without musical accompaniment
Example in sentence:
they performed a cappella
2 . a cappella
[ s]
Meaning (2): - sung without instrumental accompaniment