Source : Webster's Revised Unabridged Dictionary (1913)

Deliciousness \De*li"cious*ness\, n.
   1. The quality of being delicious; as, the deliciousness of a
      repast.

   2. Luxury. ``To drive away all superfluity and
      deliciousness.'' --Sir T. North.

Source : WordNet®

deliciousness
     n : extreme appetizingness [syn: {delectability}, {lusciousness},
          {toothsomeness}]