Where does “тридцятиліття” come from?

тридцятиліття (Ukrainian) comes from Ukrainian літо, from Ukrainian -ок, from Proto-Slavic -ъkъ, from Proto-Slavic -kъ, from Proto-Indo-European -kos — Creates deadjectival and desubstantival...

тридцятиліття (Ukrainian): thirty-year period

Definitions

  1. thirty-year period

Ancestry of “тридцятиліття”, step by step

тридцятиліття traces back through two separate lines of ancestry.

via Ukrainian літо

StepLanguageWordMeaning
1Ukrainianлітоsummer
2Ukrainian-окtakes masculine nouns, produces diminutive masculine nouns, sometimes with further sense development
3Proto-Slavic-ъkъForms diminutives from old u-stem nouns;...
4Proto-Slavic-kъDeverbal, forms token nouns; From expressive or...
5Proto-Indo-European-kosCreates deadjectival and desubstantival...

via Ukrainian три́дцять

StepLanguageWordMeaning
1Ukrainianтри́дцятьthirty (30)
Every word from Proto-Indo-European -kosEvery word from Proto-Slavic -kъEvery word from Proto-Slavic -ъkъ