Where does “сорокалетие” come from?

сорокалетие (Russian) comes from Russian ле́то, from Old East Slavic лѣто, from Proto-Slavic lěto, from Proto-Indo-European leh₁tóm.

сорокалетие (Russian): forty-year period

Definitions

  1. forty-year period

Ancestry of “сорокалетие”, step by step

сорокалетие traces back through two separate lines of ancestry.

via Russian ле́то

StepLanguageWordMeaning
1Russianле́тоyear; summer, year
2Old East Slavicлѣтоtime
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm—

via Russian со́рок

StepLanguageWordMeaning
1Russianсо́рокforty
2Old East Slavicсорокъa bunch of 40 sable pelts; a bunch of 40 sable...
3Proto-Slavic*sorkъclothing item
Every word from Proto-Indo-European leh₁tóm →Every word from Proto-Slavic lěto →Every word from Old East Slavic лѣто →