Lightness Research

light·ness (ltns) n.
1. The state or quality of having little weight or force.
2. Ease or quickness of movement; agility.
3. Ease or cheerfulness in manner or style.
4. Freedom from worry or trouble.
5. Lack of appropriate seriousness; levity.
6. Delicacy or subtlety in craft, performance, or effect.

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