• 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"

• travel via aircraft

  "air travel involves too much waiting in airports"; " if you've time to spare go by air"

  同义词： air travel aviation

• the region above the ground

  "her hand stopped in mid air"; " he threw the ball into the air"

• 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"

  同义词： airwave

• a slight wind (usually refreshing)

  "as he waited he could feel the air on his neck"

  同义词： breeze zephyr gentle wind

• a distinctive but intangible quality surrounding a person or thing

  "an air of mystery"; " the house had a neglected air"

  同义词： aura atmosphere

• the mass of air surrounding the Earth

  "it was exposed to the air"

  同义词： atmosphere

• a succession of notes forming a distinctive sequence

  "she was humming an air from Beethoven"

  同义词： tune melody strain melodic line line melodic phrase

• once thought to be one of four elements composing the universe (Empedocles)

• expose to fresh air

  同义词： air out aerate

• be broadcast

  "This show will air Saturdays at 2 P.M."

• broadcast over the airwaves, as in radio or television

  "We cannot air this X-rated song"

  同义词： send broadcast beam transmit

• make public

  "She aired her opinions on welfare"

  同义词： publicize publicise bare

• expose to warm or heated air, so as to dry
• expose to cool or cold air so as to cool or freshen

  "air the old winter clothes"; " air out the smoke-filled rooms"

  同义词： vent ventilate air out

"air war"; " air safety"; " air travel"