Source : Webster's Revised Unabridged Dictionary (1913)

Whiteness \White"ness\, n. [AS. hw[=i]tness.]
   1. The quality or state of being white; white color, or
      freedom from darkness or obscurity on the surface.
      --Chaucer.

   2. Want of a sanguineous tinge; paleness; as from terror,
      grief, etc. ``The whiteness in thy cheek.'' --Shak.

   3. Freedom from stain or blemish; purity; cleanness.

            He had kept The whiteness of his soul, and thus men
            o'er him wept.                        --Byron.

   4. Nakedness. [Obs.] --Chapman.

   5. (Zo["o]l.) A flock of swans.

Source : WordNet®

whiteness
     n : the quality or state of the achromatic color of greatest
         lightness (bearing the least resemblance to black) [syn:
         {white}] [ant: {black}]