noun (n)

• a feeling of joy and pride(noun.feeling)

  Synonym:
  elation, high spirits
  

  source: wordnet30
• the property of being comparatively small in weight(noun.attribute)

  Example:
  The lightness of balsa wood.
  

  Synonym:
  weightlessness
  Antonym:
  heaviness, weightiness
  

  source: wordnet30
• the gracefulness of a person or animal that is quick and nimble(noun.attribute)

  Synonym:
  agility, legerity, lightsomeness, nimbleness
  

  source: wordnet30
• having a light color(noun.attribute)

  Antonym:
  darkness
  

  source: wordnet30
• the visual effect of illumination on objects or scenes as created in pictures(noun.attribute)

  Synonym:
  light
  

  source: wordnet30
• the trait of being lighthearted and frivolous(noun.attribute)

  Synonym:
  lightsomeness
  

  source: wordnet30
• The state, condition, or quality, of being light or not heavy; buoyancy; levity; fickleness; nimbleness; delicacy; grace.(noun)

  source: webster1913
• Illumination, or degree of illumination; as, the lightness of a room.(noun)

  source: webster1913