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.

Pronunciation spelling of are.

(historical, philosophy, alchemy) understood as one of the four elements of the ancient Greeks and Romans.

(aviation, of an act or action) With the participants being two or more aircraft in flight. / (aviation, military, of a missile) Fired from an aircraft in flight at another one.

Alternative spelling of on the air, especially when used attributively.

(broadcasting) Synonym of on air.

Broadcasting or transmitting through the medium of radio or television. / Being, or so as to be, broadcast or transmitted by radio or television. / Smoothly; gracefully. / Happily.

Pronunciation spelling of hair.

In the surrounding ambience. / In the generally prevailing feeling, idea, atmosphere, or mood. / Prevalent without traceable origin or authority.

Alternative spelling of on air, especially when used attributively.