Source : Webster's Revised Unabridged Dictionary (1913)

Airiness \Air"i*ness\, n.
   1. The state or quality of being airy; openness or exposure
      to the air; as, the airiness of a country seat.

   2. Lightness of spirits; gayety; levity; as, the airiness of
      young persons.

Source : WordNet®

airiness
     n 1: the property of something spacious and abounding in fresh
          air
     2: the property of something weightless and insubstantial [syn:
         {buoyancy}]
     3: lightness in movement or manner [syn: {delicacy}]