WordNet (r) 3.0 (2006):

line of descent
    n 1: the kinship relation between an individual and the
         individual's progenitors [syn: descent, line of
         descent, lineage, filiation]
    2: 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]