Source : Webster's Revised Unabridged Dictionary (1913)

Propitious \Pro*pi"tious\, a. [L. propitius, perhaps originally
   a term of augury meaning, flying forward (pro) or well; cf.
   Skr. pat to fly, E. petition, feather.]
   1. Convenient; auspicious; favorable; kind; as, a propitious
      season; a propitious breeze.

   2. Hence, kind; gracious; merciful; helpful; -- said of a
      person or a divinity. --Milton.

            And now t' assuage the force of this new flame, And
            make thee [Love] more propitious in my need.
                                                  --Spenser.

   Syn: Auspicious; favorable; kind.

   Usage: {Propitious}, {Auspicious}. Auspicious (from the
          ancient idea of auspices, or omens) denotes
          ``indicative of success,'' or ``favored by incidental
          occurrences;'' as, an auspicious opening; an
          auspicious event. Propitious denotes that which
          efficaciously protect us in some undertaking, speeds
          our exertions, and decides our success; as, propitious
          gales; propitious influences. -- {Pro*pi"tious*ly},
          adv. -- {Pro*pi"tious*ness}, n.

Source : WordNet®

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