Source : Webster's Revised Unabridged Dictionary (1913)

Quietness \Qui"et*ness\, n.
   The quality or state of being quiet; freedom from noise,
   agitation, disturbance, or excitement; stillness;
   tranquillity; calmness.

         I would have peace and quietness.        --Shak.

Source : WordNet®

quietness
     n 1: the property of making no sound [syn: {soundlessness}]
     2: a state of peace and quiet [syn: {tranquillity}, {tranquility},
         {quietude}]