lightness in WordNet English dictionary

1. the gracefulness of a person or animal that is quick and nimble
   agility  legerity  lightness  lightsomeness  nimbleness 
   
2. a feeling of joy and pride
   elation  high spirits  lightness 
   
3. the visual effect of illumination on objects or scenes as created in pictures
   "he could paint the lightest light and the darkest dark"
   light  lightness 
   
4. the trait of being lighthearted and frivolous
   lightsomeness  lightness 
   
5. the property of being comparatively small in weight
   "the lightness of balsa wood"
   lightness  weightlessness 
   
6. having a light color
   lightness