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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.
air sac an air-filled space or cavity in a living organism, esp. any of the ends of certain bronchial tubes in a bird's body that connect with the larger body cavity and assist in breathing.
air shaft a narrow vertical passage through which fresh air can reach an otherwise enclosed area such as the interior of a building; ventilating shaft.
airship a lighter-than-air aircraft, with its own propulsion system and steering control.
airsick nauseated because of air travel; suffering from airsickness.
airsickness motion sickness, usu. including nausea, caused by air travel.
airspace the space extending above a particular land area, esp. that of a political entity. [2 definitions]
airspeed the speed of a flying object, esp. an aircraft, relative to the surrounding air.
airstrip an airfield or landing strip, usu. unpaved and without the personnel or equipment of an airport; runway.
air taxi a small aircraft that carries passengers or cargo over short distances, esp. to places not served by regular airlines.
airtight preventing the entrance or exit of air. [2 definitions]
airtime broadcast time allotted, as to an event or news story, on television or radio.
air-to-air of a missile or the like, designed to be shot by an aircraft at an aerial target.
airwaves the media used for transmission of radio and television signals.