air

The substance constituting earth's atmosphere, particularly:

"I'm going outside to get some air."

(usually with the) The apparently open space above the ground which this substance fills, formerly thought to be limited by the firmament but now considered to be surrounded by the near vacuum of outer space.

"The flock of birds took to the air."

A breeze; a gentle wind.

To bring (something) into contact with the air, so as to freshen or dry it.

To let fresh air into a room or a building, to ventilate.

To discuss varying viewpoints on a given topic.