The Collaborative International Dictionary of English v.0.48:

Goodness \Good"ness\, n. [AS. g[=o]dnes.]
   The quality of being good in any of its various senses;
   excellence; virtue; kindness; benevolence; as, the goodness
   of timber, of a soil, of food; goodness of character, of
   disposition, of conduct, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

goodness
    n 1: that which is pleasing or valuable or useful; "weigh the
         good against the bad"; "among the highest goods of all are
         happiness and self-realization" [syn: good, goodness]
         [ant: bad, badness]
    2: moral excellence or admirableness; "there is much good to be
       found in people" [syn: good, goodness] [ant: evil,
       evilness]