lightness

Short definition from Wiktionary

Noun

1. 1
   the condition of being illuminated
2. 2
   the relative whiteness or transparency of a colour
3. 3
   The product of being illuminated.
4. 4
   The state of having little (or less) weight, or little force.
5. 5
   Agility of movement.
6. 6
   Freedom from worry.
7. 7
   Levity, frivolity; inconsistency.