The Collaborative International Dictionary of English v.0.48:

Auspicious \Aus*pi"cious\, a. [See Auspice.]
   1. Having omens or tokens of a favorable issue; giving
      promise of success, prosperity, or happiness; predicting
      good; as, an auspicious beginning.
      [1913 Webster]

            Auspicious union of order and freedom. --Macaulay.
      [1913 Webster]

   2. Prosperous; fortunate; as, auspicious years. "Auspicious
      chief." --Dryden.
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   3. Favoring; favorable; propitious; -- applied to persons or
      things. "Thy auspicious mistress." --Shak. "Auspicious
      gales." --Pope.
      [1913 Webster]

   Syn: See Propitious.
        [1913 Webster] -- Aus*pi"cious*ly, adv. --
        Aus*pi"cious*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

auspiciousness
    n 1: the favorable quality of strongly indicating a successful
         result [syn: auspiciousness, propitiousness] [ant:
         inauspiciousness, unpropitiousness]