Source : Webster's Revised Unabridged Dictionary (1913)

Stillness \Still"ness\, n.
   1. The quality or state of being still; quietness; silence;
      calmness; inactivity.

            Painting, then, was the art demanded by the modern
            intellect upon its emergence from the stillness of
            the Middle Ages.                      --J. A.
                                                  Symonds.

   2. Habitual silence or quiet; taciturnity.

            The gravity and stillness of your youth The world
            hath noted.                           --Shak.

Source : WordNet®

stillness
     n 1: (poetic) tranquil silence; "the still of the night" [syn: {hush},
           {still}]
     2: calmness without winds [syn: {windlessness}]
     3: a state of no motion or movement [syn: {motionlessness}]
        [ant: {motion}]