The DICT Development Group

  Successful \Suc*cess"ful\, a.
     Resulting in success; assuring, or promotive of, success;
     accomplishing what was proposed; having the desired effect;
     hence, prosperous; fortunate; happy; as, a successful use of
     medicine; a successful experiment; a successful enterprise.
     [1913 Webster]
  
           Welcome, nephews, from successful wars.  --Shak.
     [1913 Webster]
  
     Syn: Happy; prosperous; fortunate; auspicious; lucky. See
          Fortunate.
          [1913 Webster] -- Suc*cess"ful*ly, adv. --
          Suc*cess"ful*ness, n.
          [1913 Webster]

  successfulness
      n 1: the condition of prospering; having good fortune [syn:
           prosperity, successfulness]