a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.

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the general character or complexion of anything; appearance: His early work had an air of freshness and originality.
airs, affected or unnatural manner; manifestation of pride or vanity; assumed haughtiness: He acquired airs that were insufferable to his friends.
Sports. (during an airborne stunt) the height between the ground and an athlete or an athlete with his or her equipment: The BMX course was designed for riders to get good air. such a jump or other airborne stunt: The snowboarder took first place with four clean airs.
to expose to the air; give access to the open air; ventilate (often followed by out): We air the bedrooms every day.
to expose ostentatiously; bring to public notice; display: to air one's opinions;to air one's theories.
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clear the air, to eliminate dissension, ambiguity, or tension from a discussion, situation, etc.: The staff meeting was intended to help clear the air.
get some air, to take a break from an unpleasant encounter or stifling environment: She walked away from the argument to get some air. to take a short rest.
get the air, Informal. to be rejected, as by a lover. to be dismissed, as by an employer: He had worked only a few days when he got the air.
give (someone) the air, Informal. to reject, as a lover: He was bitter because she gave him the air. to dismiss, as an employee.
in the air, in circulation; current: There's a rumor in the air that we're moving to a new location.
off the air, not broadcasting: The station goes off the air at midnight. not broadcast; out of operation as a broadcast: The program went off the air years ago.
on the air, in the act of broadcasting; being broadcast: The program will be going on the air in a few seconds.
put on airs, to assume an affected or haughty manner: As their fortune increased, they began to put on airs.
take the air, to go out-of-doors; take a short walk or ride.Slang. to leave, especially hurriedly. to begin broadcasting.
up in the air, Also in the waiting . undecided or unsettled: The contract is still up in the air.Informal. angry; perturbed: There is no need to get up in the air over a simple mistake.
First recorded in 1150–1200; Middle English eir, from Old French air, from Latin āēr- (accusative āerem ), from Greek āer- (stem of āḗr ) “the lower atmosphere”; conflated with (especially for defs. 4, 5) French air, Old French aire “nature, character,” Latin ager “field” (cf. acre) and ārea “threshing floor, clearing, area ”; and with (for def. 7) French air, from Italian aria aria
a region in northern Niger, in the Sahara: low massif and oases. About 30,000 sq. mi. (77,700 sq. km).

Air is the invisible mixture of gases that makes up the Earth’s atmosphere. This is what we mean when we talk about the air that we breathe. The word air is also used to refer to the appearance of something, as in an air of mystery. Air is used as a verb meaning to expose something to air, the public, or on a broadcast. The word air has many other senses, both as a noun and a verb.

Speaking scientifically, the word air refers to an invisible mixture of gases, including oxygen, nitrogen, and small amounts of many other gases. You are breathing air into your lungs right now as you read these words.

Real-life example: We are all surrounded by air. It is what makes up Earth’s atmosphere. The word air is also used generally to refer to any of the gases that can be found floating around us. For example, a balloon filled with air is most likely full of the carbon dioxide gas released from a person’s lungs.Used in a sentence: Swimmers returned to the surface so she could get a breath of air. 

The terms air or the air is used generally to refer to the sky or open space outside.

Real-life example: Airplanes and helicopters are designed to fly in the air, meaning the empty space over the ground. Birds, bats, and insects also travel through this empty space.Used in a sentence: The boy threw the ball into the air. 

Air is also used to describe a style or appearance that something or someone has. The plural airs is used when someone acts as though they are better than other people, often in the phrase put on airs.

Used in a sentence: The quiet man had an air of mystery about him. 

As a verb, air is used to variously mean exposing something to air, exposing something to the public as a whole, or to broadcast something, such as on TV, radio, or a webcast.

Real-life example: People will sometimes air a room by opening windows or air out laundry so the wind will blow smells off it. Gossip magazines and websites often air celebrity secrets or rumors. Television and radio stations air (broadcast) programs every day.Used in a sentence: The angry citizens aired their complaints to the nervous mayor.

The first records of the word air come from the later 1100s. It ultimately comes from the Greek word aēr, meaning “the lower atmosphere.” Generally speaking, the lower part of the atmosphere is the part that we live in and contains the gaseous mixture of air that we breathe and feel as wind.

Based on its pronunciation, it’s possible for the word air to be confused with several similarly sounding words. The word heir refers to a person who will inherit property from someone else. The word err means to make a mistake or to be wrong. The word e’er is a contraction of ever.

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The word ere means before.