Source : Webster's Revised Unabridged Dictionary (1913)

Sweetness \Sweet"ness\, n. [AS. sw[=e]tness.]
   The quality or state of being sweet (in any sense of the
   adjective); gratefulness to the taste or to the smell;
   agreeableness.

Source : WordNet®

sweetness
     n 1: the taste experience when sugar dissolves in the mouth [syn:
           {sweet}, {sugariness}]
     2: the property of containing sugar [syn: {sweet}]
     3: a pleasingly sweet olfactory property [syn: {bouquet}, {fragrance},
         {redolence}]
     4: the quality of giving pleasure; "he was charmed by the
        sweetness of her manner"; "the pleasantness of a cool
        breeze on a hot summer day" [syn: {pleasantness}] [ant: {unpleasantness}]