(weaponry) Atom; atomic.

(music) 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.

(music) Singing solely or mainly without instrumental accompaniment. / (music, US) Related to a form of purely vocal music mostly associated with American college performance groups.

(music) A vocal performance with no instrumental accompaniment.

(idiomatic, US, euphemistic) Of an item of merchandise, to come into a person's possession without having been paid for; to be acquired illegally; to have been stolen.

A message written on a scrap of paper, rolled-up and put in an empty bottle and set adrift on the ocean; traditionally, a method used by castaways to advertise their distress to the outside world.

(idiomatic, Britain, euphemistic) Of an item of merchandise, to come into a person's possession without having been paid for; to have been acquired illegally.

(television, film) The primary footage for non-narrative or interview-based film, usually involving talking heads or footage that directly relates to the moment.

(idiomatic, nautical) About to be married.

(Britain, slang) To fake one's own suicide.