Other forms: descents
If you’re on your way down, you’re making a descent, whether that’s as a passenger in an airplane that's landing, or if you’re tumbling down a staircase you just slipped on.
Descent comes from the verb descend — to go down. In the original Latin meaning, descent was used spatially, in reference to physical action, like going downstairs into a creepy basement. Metaphorically, though, we also use it to describe origins, especially in ancestry, when we consider ourselves descendants of our forebears.