Singing solely or mainly without instrumental accompaniment.
Related to a form of purely vocal music mostly associated with American college performance groups.
A vocal performance with no instrumental accompaniment.
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.
Placed or standing apart or alone; in isolation.
Affecting 10 percent to 20 percent of a forecast zone.
Happening or occurring only once.
Such that no pawn of the same color is in an adjacent file.
Which has been extracted from the organism.