Where does “шестилетний” come from?

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

шестилетний (Russian): six-year; six-year-old

Definitions

  1. six-year; six-year-old

Ancestry of “шестилетний”, step by step

шестилетний traces back through two separate lines of ancestry.

via Russian шесть

StepLanguageWordMeaning
1Russianшестьsix
2Old East Slavicшестьsix
3Proto-Slavicšestьsix
4Proto-Balto-Slavicšéšsix
5Proto-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 →