Source : Webster's Revised Unabridged Dictionary (1913)

Vantage \Van"tage\ (v[.a]n"t[asl]j; 48), n. [Aphetic form of OE.
   avantage, fr. F. avantage. See {Advantage}.]
   1. superior or more favorable situation or opportunity; gain;
      profit; advantage. [R.]

            O happy vantage of a kneeling knee!   --Shak.

   2. (Lawn Tennis) The first point after deuce.

   Note: When the server wins this point, it is called vantage
         in; when the receiver, or striker out, wins, it is
         called vantage out.

   {To have at vantage}, to have the advantage of; to be in a
      more favorable condition than. ``He had them at vantage,
      being tired and harassed with a long march.'' --Bacon.

   {Vantage ground}, superiority of state or place; the place or
      condition which gives one an advantage over another. ``The
      vantage ground of truth. --Bacon.

            It is these things that give him his actual
            standing, and it is from this vantage ground that he
            looks around him.                     --I. Taylor.