Air  —n. 1 mixture mainly of oxygen and nitrogen surrounding the earth. 2 earth's atmosphere; open space in it; this as a place for flying aircraft. 3 a distinctive impression or manner (air of mystery). B (esp. In pl.) Pretentiousness (gave himself airs). 4 tune. 5 light wind. —v. 1 expose (clothes, a room, etc.) To fresh air or warmth to remove damp. 2 express and discuss publicly (an opinion, question, grievance, etc.).  by air by or in an aircraft. In the air 1 (of opinions etc.) Prevalent. 2 (of plans etc.) Uncertain. On (or off) the air being (or not being) broadcast. [greek aer]