Source : Webster's Revised Unabridged Dictionary (1913)

Victorious \Vic*to"ri*ous\, a. [L. victoriosus: cf. F.
   victorieux. See {Victory}.]
   Of or pertaining to victory, or a victor' being a victor;
   bringing or causing a victory; conquering; winning;
   triumphant; as, a victorious general; victorious troops; a
   victorious day.

         But I shall rise victorious, and subdue My vanquisher.
                                                  --Milton.

         Now are our brows bound wind victorious wreaths.
                                                  --Shak.
   -- {Vic*to"ri*ous*ly}, adv. -- {Vic*to"ri*ous*ness}, n.

Source : WordNet®

victoriously
     adv : in a victorious manner; "Virginia had defended her land
           victoriously"