1. (n.) The state, condition, or quality, of being light or not heavy; buoyancy; levity; fickleness; nimbleness; delicacy; grace.

2. (n.) Illumination, or degree of illumination; as, the lightness of a room.

3. (n.) Absence of depth or of duskiness in color; as, the lightness of a tint; lightness of complexion.