Source : Webster's Revised Unabridged Dictionary (1913)

Seigniory \Seign"ior*y\, n.; pl. {-ies}. [OE. seignorie, OF.
   seigneurie, F. seigneurie; cf. It. signoria.]
   1. The power or authority of a lord; dominion.

            O'Neal never had any seigniory over that country but
            what by encroachment he got upon the English.
                                                  --Spenser.

   2. The territory over which a lord holds jurisdiction; a
      manor. [Written also {seigneury}, and {seignory}.]

Source : WordNet®

seigneury
     n : the estate and power of a seigneur [syn: {seigniory}, {signory}]