Where does “усвоить” come from?

усвоить (Russian) comes from Russian свой, from Russian свои, from Proto-Slavic svojь, from Proto-Indo-European swoyos, from Proto-Indo-European swé — self.

Ancestry of “усвоить”, step by step

Step	Language	Word	Meaning
1	Russian	свой	one's own; my, his, her, its, our, your, their;...
2	Russian	свои	inflection of свой : ## nominative plural ##...
3	Proto-Slavic	svojь	one's own
4	Proto-Indo-European	swoyos	—
5	Proto-Indo-European	swé	self

Words derived from “усвоить”

усвоение

Every word from Proto-Indo-European swé →

усвоить — Etymology, Origin & Word History | Etymology Explorer