Where does “тисячоліття” come from?

тисячоліття (Ukrainian) comes from Ukrainian тисяча, from Russian ты́сяча, from Old East Slavic тысяча, from Proto-Slavic tỳsęti, from Proto-Balto-Slavic *tū́ˀsantis, from Proto-Indo-European tuHsont-, from Proto-Indo-European tewh₂- — to swell; to crowd; to be strong.

тисячоліття (Ukrainian): millennium

Definitions

  1. millennium

Ancestry of “тисячоліття”, step by step

тисячоліття traces back through two separate lines of ancestry.

via Ukrainian тисяча

StepLanguageWordMeaning
1Ukrainianтисячаthousand
2Russianты́сячаthousand
3Old East Slavicтысяча
4Proto-Slavictỳsęti
5Proto-Balto-Slavic*tū́ˀsantisthousand
6Proto-Indo-EuropeantuHsont-thousand
7Proto-Indo-Europeantewh₂-to swell; to crowd; to be strong

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...
Every word from Proto-Indo-European tewh₂-Every word from Proto-Indo-European tuHsont-Every word from Proto-Balto-Slavic *tū́ˀsantis