(UK, aviation) A female flight attendant; a stewardess.

An inlet for air; the part of an engine, especially a jet engine, through which air is drawn.

An air show.

A mixture of hydrogen and air used as fuel to a fuel cell. / (obsolete, chemistry) An early term for hydrogen; hydrogen gas.

Alternative spelling of airflow

A duct, through which air is forced or extracted, that forms part of a building's air conditioning and ventilation system.

(military) A military airport, providing housing and support for aircraft and personnel.

(physics, meteorology) An imaginary body of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air. A parcel is large enough to contain a very great number of molecules, but small enough so that the properties assigned to it are approximately uniform within it and so that its motions with respect to the surrounding atmosphere do not induce marked compensatory movements. It cannot be given precise numerical definition, but a cubic foot of air might fit well into most contexts where air parcels are discussed, particularly those related to static stability.

A chamber, in a hydraulic system, in which air (or some other gas) is compressed to regulate the flow of a fluid.

(military) The act of using aircraft to attack an enemy to assist ground military forces.