A vocal performance with no instrumental accompaniment.
Singing solely or mainly without instrumental accompaniment.
Related to a form of purely vocal music mostly associated with American college performance groups.
In a manner of a choir with no instrumental accompaniment; literally, "in the style of the (Sistine) Chapel (in Rome)", such as a musical Mass done a cappella.
The chorus or burden of a song repeated at the end of each verse or stanza.
A much repeated comment, complaint, or saying.
To stop oneself from some action or interference; to abstain.
To abstain from (food or drink).