Bible Dictionaries
A Cappella

Webster's Dictionary

(1):

A time indication, equivalent to alla breve.

(2):

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.

Bibliography Information
Webster, Noah. Entry for 'A Cappella'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/a-cappella.html. 1828.