Definition of air noun from the Oxford Advanced American Dictionary

      

    air

     noun
    noun
    NAmE//ɛr//
     
     
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    gas
  1. 1[uncountable] the mixture of gases that surrounds the earth and that we breathe air pollution Let's go out for some fresh air. I need to put some air in my tires. currents of warm air whales coming up for air (= in order to breathe) The act lays down a minimum standard for air quality. note at outside
  2. space
  3. 2the air [uncountable] the space above the ground or that is around things I kicked the ball high in/into the air. Spicy smells wafted through the air. Music filled the night air. see also open air
  4. for planes
  5. 3[uncountable] the space above the earth where planes fly It only takes three hours by air (= in a plane). air travel/traffic The temple was clearly visible from the air. A surprise air attack (= from aircraft) was launched at night.
  6. impression
  7. 4[singular] the particular feeling or impression that is given by someone or something; the way someone does something The room had an air of luxury. She looked at him with a defiant air. There was an air of complete confidence about her.
  8. air conditioning
  9. 5the air [uncountable] = air conditioning Tell them to turn up the air.
  10. tune
  11. 6[countable] (old-fashioned) (often used in the title of a piece of music) a tune Bach's Air on a G string
  12. behavior
  13. 7airs [plural] (disapproving) a way of behaving that shows that someone thinks that they are more important, etc. than they really are I hate the way she puts on airs.
  14. Idioms
    a breath of (fresh) air
     
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    clean air breathed in after being indoors or in a dirty atmosphere We'll get a breath of fresh air at lunchtime.
    a breath of fresh air
     
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    a person, thing, or place that is new and different and therefore interesting and exciting
    (build) castles in the air
     
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    (to have) plans or dreams that are not likely to happen or come true As a child he would wander around the docks, building castles in the air about owning a boat one day.
    clear the air
     
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    to improve a difficult or tense situation by talking about worries, doubts, etc.
    come up for air
     
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    to stop doing something for a while After studying all morning, it was time to come up for air.
    disappear, vanish, etc. into thin air
     
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    to disappear suddenly in a mysterious way She can't just have vanished into thin air.
    float/walk on air
     
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    to feel very happy Most couples feel like they are walking on air on their wedding day.
    felt by a number of people to exist or to be happening There's romance in the air.
    on/off (the) air
     
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    broadcasting or not broadcasting on television or radio We will be back on air tomorrow morning at 7. The program was taken off the air over the summer.
    out of thin air
     
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    from nowhere or nothing, as if by magic Unfortunately, I can't just conjure up the money out of thin air!
    pluck something out of the air
     
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    to say a name, number, etc. without thinking about it, especially in answer to a question I just plucked a figure out of the air and said, “Would $1,000 seem reasonable to you?”
    up in the air
     
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    not yet decided Our travel plans are still up in the air.
    with your nose in the air(informal)
     
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    in a way that is unfriendly and suggests that you think that you are better than other people
See the Oxford Advanced Learner's Dictionary entry: air