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Etymology 1[edit]

light (illumination, visible light) +‎ -ness


lightness (countable and uncountable, plural lightnesses)

  1. (uncountable) the condition of being illuminated
  2. (uncountable) the relative whiteness or transparency of a colour
  3. (countable) The product of being illuminated.

Etymology 2[edit]

light (having little weight) +‎ -ness


lightness (uncountable)

  1. The state of having little weight, or little force.
  2. Agility of movement.
  3. Freedom from worry.
  4. Levity, frivolity; inconsistency.
    • 1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069; The Anatomy of Melancholy: [], 2nd corrected and augmented edition, Oxford: Printed by John Lichfield and James Short, for Henry Cripps, 1624, OCLC 54573970:
      , New York 2001, p.75:
      Seneca [] accounts it a filthy lightness in men, every day to lay new foundations of their life, but who doth otherwise?