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