noun

• (uncountable) The substance constituting Earth's atmosphere: a gaseous mixture of nitrogen, oxygen, and various trace gases.
  "This drill runs on compressed air."
• (uncountable) The substance constituting Earth's atmosphere: a gaseous mixture of nitrogen, oxygen, and various trace gases.
  "I'm going outside to get some air."
• (uncountable) The substance constituting Earth's atmosphere: a gaseous mixture of nitrogen, oxygen, and various trace gases.
• (uncountable) The substance constituting Earth's atmosphere: a gaseous mixture of nitrogen, oxygen, and various trace gases.
  "Jeeves: Foreign travel often liberates emotions best kept in check, sir. The air of North America is notoriously stimulating in this regard, as witness the regrettable behavior of its inhabitants in 1776. B. Wooster: Hm? What happened in 1776, Jeeves? Jeeves: I prefer not to dwell on it, if it's convenient to you, sir."

verb

• (transitive) To bring (something) into contact with the air, so as to freshen or dry it.
  "I'll hang these clothes on the rack to air them."
• (transitive) To let fresh air into (a room or a building), to ventilate.
  "It's getting quite stuffy in this room: let's open the windows and air it."
• (transitive) To make public (an opinion, concern, issue, secret, differences, etc); to present to public view (and sometimes discussion).
  "Residents used the public meeting to air their concerns about the poor state of the roads."
• (transitive) To broadcast (a television show etc.).
  "The BBC decided not to air the controversial episode."

name

• (rail transport) The station code of Airport in Hong Kong.
• (India) Initialism of All India Rank.