n. The state or quality of being light or bright.n. The state or quality of being light in weight; lack of heaviness or gravity: as, the lightness of a burden; the lightness of cork or of hydrogen.n. In cookery, sponginess; the state of being well raised; freedom from sogginess.n. Freedom from heaviness or clumsiness in act or execution; dexterity; nimbleness; agility: as, lightness of touch in painting or music; lightness of foot in running or dancing.n. Inconstancy; unsteadiness; fickleness.n. Levity; wantonness; unchastity.n. Light-headedness.n. Synonyms Briskness, sprightliness, ease, facility, swiftness.n. 4, Volatility, Frivolity, etc. (see levity), instability, giddiness, airiness.