Source : Webster's Revised Unabridged Dictionary (1913)

Prosperous \Pros"per*ous\, a. [L. prosperus or prosper,
   originally, answering to hope; pro according to + the root of
   sperare to hope. See {Despair}.]
   1. Tending to prosperity; favoring; favorable; helpful.

            A happy passage and a prosperous wind. --Denham.

   2. Being prospered; advancing in the pursuit of anything
      desirable; making gain, or increase; thriving; successful;
      as, a prosperous voyage; a prosperous undertaking; a
      prosperous man or nation.

            By moderation either state to bear Prosperous or
            adverse.                              --Milton.

   Syn: Fortunate; successful; flourishing; thriving; favorable;
        auspicious; lucky. See {Fortunate}. --
        {Pros"per*ous*ly}, adv. -- {Pros"per*ous*ness}, n.