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.
Something that has been isolated.
To self-isolate.
To separate a pure strain of bacteria etc. from a mixed culture.
To separate a substance in pure form from a mixture.
To insulate, or make free of external influence.
To insulate an electrical component from a source of electricity.
To set apart or cut off from others.
To place in quarantine or isolation.