Where does “девятилетний” come from?

девятилетний (Russian) comes from Russian девять, from Old East Slavic де́вѧть, from Proto-Slavic devętь, from Proto-Indo-European h₁néwn̥ — nine.

девятилетний (Russian): nine-year

Definitions

  1. nine-year

Ancestry of “девятилетний”, step by step

девятилетний traces back through two separate lines of ancestry.

via Russian девять

StepLanguageWordMeaning
1Russianдевятьnine
2Old East Slavicде́вѧтьnine
3Proto-Slavicdevętьnine
4Proto-Indo-Europeanh₁néwn̥nine

via Russian ле́то

StepLanguageWordMeaning
1Russianле́тоyear; summer, year
2Old East Slavicлѣтоtime
3Proto-Slaviclětosummer; year
4Proto-Indo-Europeanleh₁tóm—
Every word from Proto-Indo-European h₁néwn̥ →Every word from Proto-Slavic devętь →Every word from Old East Slavic де́вѧть →