noun

1. the elastic, invisible mixture of gases (chiefly nitrogen and oxygen, as well as hydrogen, carbon dioxide, argon, neon, helium, etc.) that surrounds the earth; atmosphere
2. space above the earth; sky
3. 1. a movement of air; breeze; wind
   2. cool, refreshing air; fresh air
4. compressed air
5. an outward appearance; general impression or feeling given by something an air of luxury fills the room
6. a pervading or surrounding influence or condition; general mood or social environment controversy troubling the air at the convention; an apology designed to clear the air
7. a person's bearing, manner, or appearance
8. affected, superior manners and graces
9. public expression or publicity give air to your opinions
10. transportation or travel by aircraft to go by air
11. the medium through which radio signals are transmitted
12. air conditioning
13. Music
    1. a song or tune
    2. the main melody in a harmonized composition, usually the soprano or treble part

Etymology: ME < OFr < L aer < Gr aēr, air, mist

adjective

transitive verb

1. to let air into or through; put where air can dry, cool, freshen, etc.
2. to make known publicly; publicize
3. to broadcast on radio or television

intransitive verb

1. to become aired, dried, cooled, etc.
2. to be broadcast on radio or television