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Comprehensive
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air letter an airmail letter. [2 definitions]
airlift the systematic transportation of people or supplies by air when ground routes are impossible or dangerous to use, esp. in a battle zone or during an emergency. [2 definitions]
airline a system of transportation by air offering scheduled flights between various points, or a business that owns and operates the equipment required by such a system. [2 definitions]
airliner a commercial passenger airplane.
air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [2 definitions]
airmail of, pertaining to, or intended for use with mail sent by air. [5 definitions]
airman in the U.S. Air Force, an enlisted person of one of the four lowest ranks. [3 definitions]
air mass a body of air that covers a wide area and has little horizontal variation in temperature, pressure, or moisture.
air-minded enthusiastic about aviation.
air one's dirty linen in public to make public embarrassing or shameful private facts about oneself or others.
air piracy the hijacking of an airplane, helicopter, or the like.
airplane any of various aircraft that are heavier than air and are driven by propellers or jet engines.
airplay the broadcasting of a recording by a radio or television station.
air pocket a downward air current that can cause an abrupt change, usu. a drop, in an aircraft's altitude.
airport a large area of level land where airplanes can land and take off, usu. including a passenger terminal and cargo and repair facilities.
air power a country's military capacity for waging war by air.
air pressure the pressure of compressed air, as in a tire or pump, or the pressure of the earth's atmosphere.
airproof not allowing air to pass or penetrate. [2 definitions]
air pump a pump for suctioning, compressing, or injecting air.
air raid a military raid by aircraft, esp. bombers.
air rifle a rifle operated by compressed air, used to fire small pellets or the like.