The Collaborative International Dictionary of English v.0.48:

Generous \Gen"er*ous\, a. [F. g['e]n['e]reux, fr. L. generous of
   noble birth, noble, excellent, magnanimous, fr. genus birth,
   race: cf. It. generoso. See 2d Gender.]
   [1913 Webster]
   1. Of honorable birth or origin; highborn. [Obs.]
      [1913 Webster]

            The generous and gravest citizens.    --Shak.
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   2. Exhibiting those qualities which are popularly reregarded
      as belonging to high birth; noble; honorable; magnanimous;
      spirited; courageous. "The generous critic." --Pope. "His
      generous spouse." --Pope. "A generous pack [of hounds]."
      --Addison.
      [1913 Webster]

   3. Open-handed; free to give; not close or niggardly;
      munificent; as, a generous friend or father.
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   4. Characterized by generosity; abundant; overflowing; as, a
      generous table. --Swift.
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   5. Full of spirit or strength; stimulating; exalting; as,
      generous wine.

   Syn: Magnanimous; bountiful. See Liberal. --
        Gen"er*ous*ly, adv. -- Gen"er*ous*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

generousness
    n 1: the trait of being willing to give your money or time [syn:
         generosity, generousness] [ant: stinginess]