Where does “основной” come from?

основной (Russian) comes from Russian осно́ва, from Old East Slavic основа, from Proto-Slavic osnova — basis, foundation.

основной (Russian): basic, fundamental, main, primary, principal,...

Definitions

  1. basic, fundamental, main, primary, principal,...

Ancestry of “основной”, step by step

StepLanguageWordMeaning
1Russianосно́ваbasis, foundation
2Old East Slavicоснова—
3Proto-Slavicosnovabasis, foundation

Words derived from “основной”

Every word from Proto-Slavic osnova →Every word from Old East Slavic основа →Every word from Russian осно́ва →