Where does “восьмидесятилетие” come from?

восьмидесятилетие (Russian) comes from Russian восемьдесят, from Russian восемь, from Old Church Slavonic осмь, from Proto-Slavic osmь, from Proto-Balto-Slavic aśmas, from Proto-Indo-European oḱtṓwos, from Proto-Indo-European oḱtṓw, from Proto-Indo-European aḱ- — sharp, pointed; sharp, pointed, edgy; sharp,...

восьмидесятилетие (Russian): eighty-year period

Definitions

  1. eighty-year period

Ancestry of “восьмидесятилетие”, step by step

восьмидесятилетие traces back through two separate lines of ancestry.

via Russian восемьдесят

StepLanguageWordMeaning
1Russianвосемьдесятeighty (80)
2Russianвосемьeight
3Old Church Slavonicосмьeight
4Proto-Slavicosmьeight
5Proto-Balto-Slavicaśmas
6Proto-Indo-Europeanoḱtṓwoseighth
7Proto-Indo-Europeanoḱtṓweight
8Proto-Indo-Europeanaḱ-sharp, pointed; sharp, pointed, edgy; sharp,...

via Russian ле́то

StepLanguageWordMeaning
1Russianле́тоyear; summer, year
2Old East Slavicлѣтоtime
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm
Every word from Proto-Indo-European aḱ-Every word from Proto-Indo-European oḱtṓwEvery word from Proto-Indo-European oḱtṓwos