descent
de-scent
noun
The act of moving or coming down from a higher to a lower place.
"The aircraft began its descent towards the runway."
noun
A person's family origins or ethnic background.
"She is of Irish descent."
Thesaurus
Synonyms: declination, downslope, fall, declension, decline, declivity, filiation, lineage, line of descent, stemma, stock, blood line