Where does “самоотверженность” come from?

самоотверженность (Russian) comes from Russian самоотве́рженный, from Russian само́-, from Russian сам, from Old East Slavic самъ, from Proto-Slavic samъ, from Proto-Balto-Slavic *sāmas, from Proto-Indo-European somHós, from Proto-Indo-European sem- — together, one.

самоотверженность (Russian): selflessness, dedication, disregard of self

Definitions

  1. selflessness, dedication, disregard of self

Ancestry of “самоотверженность”, step by step

StepLanguageWordMeaning
1Russianсамоотве́рженныйselfless
2Russianсамо́-self-
3Russianсамself, -self
4Old East Slavicсамъself, oneself, alone
5Proto-Slavicsamъself, oneself
6Proto-Balto-Slavic*sāmas—
7Proto-Indo-EuropeansomHóssame, alike
8Proto-Indo-Europeansem-together, one
Every word from Proto-Indo-European sem- →Every word from Proto-Indo-European somHós →Every word from Proto-Balto-Slavic *sāmas →