line of descent is a noun meaning "the kinship relation between an individual and the individual's progenitors". It carries 2 recorded senses.
the kinship relation between an individual and the individual's progenitors
the descendants of one individual
“his entire lineage has been warriors”
Definitions, synonyms and semantic relations for line of descent come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.