An equal mixture of nitrous oxide and oxygen, used as a mild analgesic and anaesthetic, particularly during childbirth, for dental procedures, and in emergency medicine.

The capital city of Argentina. / The largest and most populous province in Argentina, part of the Pampas region.

(idiomatic, broadcasting) An unintended interruption in a broadcast during which nothing is transmitted: a silent period on radio or a silent period with no picture on television.

A branch of the military mainly devoted to air warfare, as opposed to (land) army and navy. / A unit in the U.S. Air Force larger than a division but smaller than a command.

A rifle that propels a pellet or other projectile by using compressed gas, rather than an explosion of gunpowder or other means.

An imaginary guitar that a listener to (usually rock) music pretends to play.

(intransitive) To mime the action of playing a guitar.

Cooled by air (such as an engine, rather than by other means such as water).

(usually in the plural) A two-handed gesture resembling quotation marks.

a public display of stunt flying, aerobatics, and historical aircraft.