a local region of low atmospheric pressure, or a local downward current; especially one that causes an aircraft to lose height suddenly

A pump that moves air either into or out of something.

An aerogram; a letter sent by airmail.

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.

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

A unit of distance for air transport; equal to a nautical mile.

(board sports, idiomatic) To make a jump.

(UK) Alternative spelling of air conditioning

present participle of air-condition

Alternative spelling of air-conditioning