(music) The open chamber (resonator) of a stringed musical instrument, which intensifies its tone.

(uncountable) The technical discipline of recording and producing sound. / (less frequently) Engineering which is sound in the sense of being reliable.

(physics) The speed at which sound is propagated through some medium under specified conditions.

One who practices sound engineering.

(journalism, television) An extract from a speech or interview used as edited into a news or other broadcast; an interview clip, especially seen as particularly expressive or pithy.

Merseybeat.

Merseybeat.

(uncountable) Sonic barrier, the sudden increase in drag (resistance) and other effects experienced by moving objects when their speed approaches that of sound or becomes supersonic (which used to be considered a barrier to higher speeds).

(idiomatic) Sleeping still and silently.

(film, television) A soundproof room or building used for the production of movies or of television programmes.