The Collaborative International Dictionary of English v.0.48:

Ancestry \An"ces*try\, n. [Cf. OF. ancesserie. See Ancestor.]
   1. Condition as to ancestors; ancestral lineage; hence, birth
      or honorable descent.
      [1913 Webster]

            Title and ancestry render a good man more
            illustrious, but an ill one more contemptible.
                                                  --Addison.
      [1913 Webster]

   2. A series of ancestors or progenitors; lineage, or those
      who compose the line of natural descent.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ancestry
    n 1: the descendants of one individual; "his entire lineage has
         been warriors" [syn: lineage, line, line of descent,
         descent, bloodline, blood line, blood, pedigree,
         ancestry, origin, parentage, stemma, stock]
    2: inherited properties shared with others of your bloodline
       [syn: ancestry, lineage, derivation, filiation]