Noun
1. a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of;
"air pollution""a smell of chemicals in the air""open a window and let in some air""I need some fresh air"2. travel via aircraft;
"air travel involves too much waiting in airports""if you've time to spare go by air"3. the region above the ground;
"her hand stopped in mid air""he threw the ball into the air"4. medium for radio and television broadcasting;
"the program was on the air from 9 til midnight""the president used the airwaves to take his message to the people"5. a slight wind (usually refreshing);
"the breeze was cooled by the lake""as he waited he could feel the air on his neck"6. a distinctive but intangible quality surrounding a person or thing;
"an air of mystery""the house had a neglected air""an atmosphere of defeat pervaded the candidate's headquarters""the place had an aura of romance"7. the mass of air surrounding the Earth;
"there was great heat as the comet entered the atmosphere""it was exposed to the air"8. a succession of notes forming a distinctive sequence;
"she was humming an air from Beethoven"9. once thought to be one of four elements composing the universe (Empedocles)