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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.
airstrike an attack by air forces or other military aviation against a ground or naval target.
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.
air traffic movement of airplanes and other air transportation vehicles through the air or on runways.
airwaves the media used for transmission of radio and television signals.
airway a route of passage for an aircraft. [3 definitions]
air well a usu. central court that is enclosed by the exterior walls of a building and provides air and light.
airworthy fit and safe for use in flight.
airy open to the flow of air; breezy. [5 definitions]
aisle any passageway, as between sections of seats in a theater or sections of shelves in a store. [2 definitions]
ajar1 partly opened, as a hinged door, window, or lid.