Where does “шестидесятилетие” come from?

шестидесятилетие (Russian) comes from Russian шестьдесят, from Russian шесть, from Old East Slavic шесть, from Proto-Slavic šestь, from Proto-Balto-Slavic šéš, from Proto-Indo-European swéḱs — six.

шестидесятилетие (Russian): sixty-year period

Definitions

  1. sixty-year period

Ancestry of “шестидесятилетие”, step by step

шестидесятилетие traces back through two separate lines of ancestry.

via Russian шестьдесят

StepLanguageWordMeaning
1Russianшестьдесятsixty (60)
2Russianшестьsix
3Old East Slavicшестьsix
4Proto-Slavicšestьsix
5Proto-Balto-Slavicšéšsix
6Proto-Indo-Europeanswéḱssix

via Russian ле́то

StepLanguageWordMeaning
1Russianле́тоyear; summer, year
2Old East Slavicлѣтоtime
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm—
Every word from Proto-Indo-European swéḱs →Every word from Proto-Balto-Slavic šéš →Every word from Proto-Slavic šestь →