- The quality or state of being illuminated.
- The quality or state of being light especially in weight.
- Lack of seriousness and stability of character often accompanied by casual heedlessness.
- The quality or state of being nimble.
- An ease and gaiety of style or manner.
- A lack of weightiness or force.
The emotion of Lightness is found in the Triple Heater meridian in the Fire element.
Definition from Dictionary by Merriam-Webster.