What does AIR mean?

noun

1. a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of“air pollution”
2. the region above the ground“her hand stopped in mid air”
3. a distinctive but intangible quality surrounding a person or thing“an air of mystery”
4. a slight wind (usually refreshing)“the breeze was cooled by the lake”
5. the mass of air surrounding the Earth“there was great heat as the comet entered the atmosphere”
6. once thought to be one of four elements composing the universe (Empedocles)
7. a succession of notes forming a distinctive sequence“she was humming an air from Beethoven”
8. medium for radio and television broadcasting“the program was on the air from 9 til midnight”