Source : Webster's Revised Unabridged Dictionary (1913)

Margrave \Mar"grave\, n. [G. markgraf, prop., lord chief justice
   of the march; mark bound, border, march + graf earl, count,
   lord chief justice; cf. Goth. gagr["e]fts decree: cf. D.
   markgraaf, F. margrave. See {March} border, and cf.
   {Landgrave}, {Graff}.]
   1. Originally, a lord or keeper of the borders or marches in
      Germany.

   2. The English equivalent of the German title of nobility,
      markgraf; a marquis.

Source : WordNet®

margrave
     n 1: the military governor of a frontier province in medieval
          Germany
     2: a German nobleman ranking above a count (corresponding in
        rank to a British marquess)