Source : Webster's Revised Unabridged Dictionary (1913)

Princedom \Prince"dom\, n.
   The jurisdiction, sovereignty, rank, or estate of a prince.

         Thrones, princedoms, powers, dominions, I reduce.
                                                  --Milton.

Source : WordNet®

princedom
     n 1: the dignity or rank or position of a prince
     2: territory ruled by a prince [syn: {principality}]