The Collaborative International Dictionary of English v.0.48:

Pedigree \Ped"i*gree\ (p[e^]d"[i^]*gr[=e]), n. [Of unknown
   origin; possibly fr. F. par degr['e]s by degrees, -- for a
   pedigree is properly a genealogical table which records the
   relationship of families by degrees; or, perh., fr. F. pied
   de grue crane's foot, from the shape of the heraldic
   genealogical trees.]
   1. A line of ancestors; descent; lineage; genealogy; a
      register or record of a line of ancestors.
      [1913 Webster]

            Alterations of surnames . . . have obscured the
            truth of our pedigrees.               --Camden.
      [1913 Webster]

            His vanity labored to contrive us a pedigree.
                                                  --Milton.
      [1913 Webster]

            I am no herald to inquire of men's pedigrees. --Sir
                                                  P. Sidney.
      [1913 Webster]

            The Jews preserved the pedigrees of their tribes.
                                                  --Atterbury.
      [1913 Webster]

   2. (Stock Breeding) A record of the lineage or strain of an
      animal, as of a horse.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pedigree
    adj 1: having a list of ancestors as proof of being a purebred
           animal [syn: pedigree(a), pedigreed, pureblood,
           pureblooded, thoroughbred]
    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: line of descent of a purebred animal
    3: ancestry of a purebred animal [syn: pedigree, bloodline]

The Devil's Dictionary (1881-1906):

PEDIGREE, n.  The known part of the route from an arboreal ancestor
with a swim bladder to an urban descendant with a cigarette.