lightness

noun7

1. •
   The state of having little (or less) weight, or little force.

   • The unique chassis design is largely the secret of the lightness of the locomotive. — 1960
2. •
   the condition of being illuminated

   • Well, darkness has a hunger that's insatiable and lightness has a call that's hard to hear. — 1989
3. •
   The product of being illuminated.
4. •
   the relative whiteness or transparency of a colour
5. •
   Freedom from worry.

   • In the lightness of my heart I sang catches of songs as my horse gayly bore me along the well-remembered road. — 1852
6. •
   Agility of movement.
7. •
   Levity, frivolity; inconsistency.

   • Seneca […] accounts it a filthy lightness in men, every day to lay new foundations of their life, but who doth otherwise? — 2001