Where does “семилетний” come from?

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

семилетний (Russian): seven-year; seven-year-old

Definitions

  1. seven-year; seven-year-old

Ancestry of “семилетний”, step by step

семилетний 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 семь

StepLanguageWordMeaning
1Russianсемьseven
2Proto-Slavicsedmьseven
3Proto-Indo-Europeanseptḿ̥seven
Every word from Proto-Indo-European leh₁tóm →Every word from Proto-Slavic lěto →Every word from Old East Slavic лѣто →