Where does “усваиваться” come from?

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

Ancestry of “усваиваться”, step by step

StepLanguageWordMeaning
1Russianусва́иватьto master, to learn
2Russianусво́итьto master, to learn
3Russianсвойone's own; my, his, her, its, our, your, their;...
4Russianсвоиinflection of свой : ## nominative plural ##...
5Proto-Slavicsvojьone's own
6Proto-Indo-Europeanswoyos—
7Proto-Indo-Europeanswéself
Every word from Proto-Indo-European swé →Every word from Proto-Indo-European swoyos →Every word from Proto-Slavic svojь →