noun (n)

• the property of something spacious and abounding in fresh air(noun.attribute)

  source: wordnet30
• the property of something weightless and insubstantial(noun.attribute)

  Synonym:
  buoyancy
  

  source: wordnet30
• lightness in movement or manner(noun.attribute)

  Synonym:
  delicacy
  

  source: wordnet30
• The state or quality of being airy; openness or exposure to the air; as, the airiness of a country seat.(noun)

  source: webster1913