airair1 /eə $ er/ ●●●S1W1 noun1gas [uncountable] the mixture of gases around the Earth, that we breatheLet’s go outside and get some fresh air.You need to put some air in the tyres.in the airThere was a strong smell of burning in the air. → a breath of fresh airat breath(2)2 →the air3planesa)by airTTAtravelling by, or using, a planeI’d prefer to travel by air.b)TTArelating to or involving planesthe victims of Britain’s worst air disasterAir travel was growing rapidly.air traffic congestionHis brother died in an air crash.4 →be in the air5appearance [singular] if something or someone has an air of confidence, mystery etc, they seem confident, mysterious etcair ofShe had an air of quiet confidence.She looked at him with a determined air.6 →be up in the air7 →be on/off (the) air8music [countable] a simpletune, often used in the title of a piece of classicalmusic9 →airs10 →be walking/floating on air →hot air, on-air, → clear the airat clear2(15), → disappear/vanish into thin airat thin1(15), → out of thin airat thin1(16)COLLOCATIONSadjectivesfresh She opened the window to let in some fresh air.clean London’s air is cleaner than it has been at any time since 1585.warm/hotWarm air rises and is replaced by cooler and denser air.I felt a sudden rush of hot air.cool/coldThe air had turned a little cooler. crisp (=pleasantly cool)the crisp autumn airclearI looked up to the stars in the clear night air.damp/humidDamp air causes condensation.pollutedThe air in Mexico City is heavily polluted. stale (=not fresh and often full of smoke)The room was full of stale air and tobacco smoke.the air is thin (=there is less oxygen because you are in a high place)People cannot live up there because the air is too thin and there is not enough oxygen to breathe. the morning/evening/night airHe stepped out and breathed in the cold morning air.the sea/mountain/country airthe salty smell of the sea airthe still air (=air in which there is no wind)Smoke from the chimneys hung in the still air.air + NOUNair pollutionMost air pollution is caused by cars.the air qualityThe air quality is very poor on hot days.the air pressureThe air pressure had dropped.phrasesa breath of airI went outside for a breath of air.a rush/blast/stream of airThere was a cold rush of air as she wound down her window.a current of airThe birds are able to glide on a current of warm air.verbsbreathe in the airShe breathed in the cool mountain air.fight/gasp for air (=try to breathe with difficulty)He clutched his throat as he fought for air.let in some air (=let fresh air into a room)It would be nice to open the door and let in some air.put air into something (=fill a tyre, balloon etc with air)I need to put some air in the tyres.GRAMMAR: Patterns with airin the air• You say that something is in the air: The plane was in the air.Put your hands in the air!✗Don’t say: The plane was on the air. into the air• You say that something goes up into the air: The plane went up into the air.on the air• You say that a TV or radio programme is on the air or on air (=it is broadcast): The show has been on the air for over 30 years.