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]