airlockA sealed, airtight chamber, such as in a manned spacecraft or submarine, used to provide access to and from the sealed area without allowing air out or water in.
airportAn airfield (an area designated for the takeoff and landing of aircraft), including one or more runways and (for commercial airports) one or more passenger terminals.
airshaftA vertical (or near vertical) opening (shaft) running from a courtyard to the sky, thus allowing air to circulate to high-rise apartments or offices.
airshiftA block of continuous broadcast time, often four or six hours.
airshipA lighter-than-air aircraft that can be propelled forward through the air as well as steered.
airshootA shot at something that is in the air, or a shot in midair.
airsickNauseated due to the effects of motion of an aircraft; suffering from motion sickness caused by air travel.
airsicknessA feeling of nausea, dizziness etc. caused by the motion of an aircraft; a form of motion sickness.
airsideIn the passenger-only area of an airport, beyond security, passport and immigration, and customs controls.
airsledA small hovercraft used to move heavy loads, typically in a warehouse
airsoftA modern combat sport in which participants eliminate their opponents by hitting them with spherical non-metallic pellets launched from a type of air gun running compressed air or similar compressed gas (e.g., carbon dioxide).
airsomeCharacterised or marked by air, especially bracingly cold air; windy; stormy.
airspaceA specified portion of the atmosphere, especially that under the technical aviation control and/or jurisdiction of a particular state over which territory (and territorial waters) it lies.
AirspeakA controlled form of natural language based on English and designed to facilitate communication between aircraft pilots and air traffic controllers.
airspeedThe speed of an aircraft relative to the air through which it is flying.
airstoneA piece of aquarium furniture, traditionally limewood or porous stone, whose purpose is to diffuse oxygen gradually into the tank, eliminating the noise and large bubbles of conventional air filtration systems.
airwattA unit of measurement that represents the true suction power of vacuum cleaners. It is calculated by multiplying the airflow (in cubic metres per second) by the suction pressure (in pascals).
airwavesRadio-frequency electromagnetic waves, usually used in the context of wireless communication; radio waves.
aislewayAisle (clear path between seats, shelves, etc).
aislingA kind of Irish poem, developed during the late 17th and 18th centuries, in which Ireland appears to the poet in a vision in the form of a woman, lamenting the state of the Irish people and predicting the revival of their fortunes.