Webster’s Revised Unabridged Dictionary · 1913
Lightness
Light′ness, n. [From Light not heavy.] The state, condition, or quality, of being light or not heavy; buoyancy; levity; fickleness; nimbleness; delicacy; grace.
Syn. — Levity; volatility; instability; inconstancy; unsteadiness; giddiness; flightiness; airiness; gayety; liveliness; agility; nimbleness; sprightliness; briskness; swiftness; ease; facility.
Light′ness, n. [From Light bright.] 1. Illumination, or degree of illumination; as, the lightness of a room. Chaucer.
2. Absence of depth or of duskiness in color; as, the lightness of a tint; lightness of complexion.