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

(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).

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

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.

(physics) The longitudinal wave of pressure that is transmitted through any plastic material; audible sound.

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

(idiomatic) Sleeping still and silently.

(music) A subgenre of country music that became popular in the 1950s and 1960s, containing elements of popular music and characterized by electronic string sections, background vocals, and orchestras.

A style of country music developed and popularized during the 1950s and 1960s, featuring Fender Telecaster guitars, a drum backbeat, fiddles and steel guitars, along with stylistic touches from rock music.