noun
descent
di-SENT/dɪˈsent/
Movement downward from a higher point or earlier source.
The woman makes her descent toward the lower landing.

Etymology
Old French descente covered both coming down and lineage. English first used it for ancestry, then extended it to the physical act of passing from a higher place to a lower one.
In context
Abseil line of descent. This really would have been an awful place to start trying to get down
More examples
- The plane begins its descent through the clouds.
- The novel follows a politician's descent into corruption.
- He traces his descent through his mother's family.
Forms
descent · descents
descend verb — To move from higher to lower.
descendant noun — A person related to an earlier ancestor.