The Collaborative International Dictionary of English v.0.48:

Patrimony \Pat"ri*mo*ny\, n.; pl. Patrimonies. [L.
   patrimonium, fr. pater father: cf. F. patrimoine. See
   Paternal.]
   1. A right or estate inherited from one's father; or, in a
      larger sense, from any ancestor. "'Reave the orphan of his
      patrimony." --Shak.
      [1913 Webster]

   2. Formerly, a church estate or endowment. --Shipley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

patrimony
    n 1: a church endowment
    2: an inheritance coming by right of birth (especially by
       primogeniture) [syn: birthright, patrimony]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "patrimony":
   bequeathal, bequest, birthright, borough-English, coheirship,
   coparcenary, entail, gavelkind, heirloom, heirship, hereditament,
   heritable, heritage, heritance, incorporeal hereditament,
   inheritance, law of succession, legacy, line of succession,
   mode of succession, postremogeniture, primogeniture, reversion,
   succession, ultimogeniture