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

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

(literally) Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon. / (idiomatic) Empty, confused, or exaggerated talk lacking meaning or substance; bluster.

A mattress that is inflated with air, and used as a temporary or permanent bed.

(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning”).

simple past tense and past participle of air-condition

Equipped with and climate-controlled by air-conditioning; cooled by an air-conditioner.

A region's air supply. / The region supplied by a source of air.

A small aircraft that makes short passenger flights, especially to destinations not serviced by airlines.

An opening, possibly covered by a grate or grill, possibly ducted, that allows air to circulate. / A device or valve that allows to air to be evacuated from a radiator or pipe in a heating system.