Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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air bag a bag in the front of some cars that blows up with air instantly in a crash to stop the passengers from being thrown forward.
air conditioner a machine that cools the air in a room or car. An air conditioner also takes the dust and dampness out of the air.
air conditioning a system that cools air and takes dust and dampness out of it. Air conditioning is used inside buildings and cars.
air force the branch of a nation's armed forces that trains and fights using aircraft.
air pressure the force of air on things. Air pressure has to do with how much force air has when it has been compressed into a space like a tire. It is also the pressure of the earth's atmosphere.
into thin air out of sight.
off the air not broadcast on radio or television.
on the air broadcast on radio or television.
up in the air not decided, not settled, or not certain.