gas1 [uncountable] the mixture of gases that surrounds the earth and that we breatheair pollutionLet's go out for some fresh air.I need to put some air in my tires.currents of warm airwhales coming up for air (= in order to breathe)The act lays down a minimum standard for air quality. note at outside
space2 usually the air [uncountable] the space above the ground or that is around thingsI kicked the ball high in/into the air.Spicy smells wafted through the air.Music filled the night air. see also open air
for planes3 [uncountable] the space above the earth where planes flyIt only takes three hours by air (= in a plane).air travel/trafficThe temple was clearly visible from the air.A surprise air attack (= from aircraft) was launched at night.
impression4 [singular] the particular feeling or impression that is given by someone or something; the way someone does somethingThe room had an air of luxury.She looked at him with a defiant air.There was an air of complete confidence about her.
air conditioning5 often the air [uncountable] = air conditioningTell them to turn up the air.
tune6 [countable] (old-fashioned) (often used in the title of a piece of music) a tuneBach's Air on a G string
behavior7 airs [plural] (disapproving) a way of behaving that shows that someone thinks that they are more important, etc. than they really areI hate the way she puts on airs.
a breath of (fresh) air
clean air breathed in after being indoors or in a dirty atmosphereWe'll get a breath of fresh air at lunchtime.a breath of aira breath of fresh air
a breath of fresh air
a person, thing, or place that is new and different and therefore interesting and excitinga breath of fresh air
(build) castles in the air
(to have) plans or dreams that are not likely to happen or come trueAs a child he would wander around the docks, building castles in the air about owning a boat one day.castles in the airbuild castles in the air
clear the air
to improve a difficult or tense situation by talking about worries, doubts, etc.clear the air
come up for air
to stop doing something for a whileAfter studying all morning, it was time to come up for air.come up for air
disappear, vanish, etc. into thin air
to disappear suddenly in a mysterious wayShe can't just have vanished into thin air.disappear, vanish, etc. into thin air
float/walk on air
to feel very happyMost couples feel like they are walking on air on their wedding day.float on airwalk on air
in the air
felt by a number of people to exist or to be happeningThere's romance in the air.in the air
on/off (the) air
broadcasting or not broadcasting on television or radioWe will be back on air tomorrow morning at 7.The program was taken off the air over the summer.on airon the airoff airoff the air
out of thin air
from nowhere or nothing, as if by magicUnfortunately, I can't just conjure up the money out of thin air!out of thin air
pluck something out of the air
to say a name, number, etc. without thinking about it, especially in answer to a questionI just plucked a figure out of the air and said, “Would $1,000 seem reasonable to you?”pluck out of the air
up in the air
not yet decidedOur travel plans are still up in the air.up in the air