Where does “двенадцатилетний” come from?

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

двенадцатилетний (Russian): twelve-year

Definitions

  1. twelve-year

Ancestry of “двенадцатилетний”, step by step

двенадцатилетний 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 двена́дцать

StepLanguageWordMeaning
1Russianдвена́дцатьtwelve (12)
2Russian-надцать-teen, "suffix forming cardinal numbers from...
Every word from Proto-Indo-European leh₁tóm →Every word from Proto-Slavic lěto →Every word from Old East Slavic лѣто →