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 sound of a bird; any short high-pitched sound or whistle.
An entry posted on the microblogging service Twitter.
The sound of a bird twittering.
To make a short high-pitched sound, like that of certain birds.
To post an update to Twitter.