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This Proto-Slavic entry contains reconstructed words and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.



From *tъ (this, that) +‎ *dьnь (day). Some descendants also contain *že. After 7 days the days of the week repeat. This form is preferred by the Catholic tribes, while the Orthodox tribes use the word for Sunday also for week.


*tъdьnь m

  1. week


See also[edit]



  • Sreznevskij, I. I. (1912) , “Proto-Slavic/tъdьnь”, in Materialy dlja slovarja drevne-russkago jazyka po pisʹmennym pamjatnikam [Materials for the Dictionary of the Old Russian Language According to Written Monuments] (in Russian), volume 3, Saint Petersburg: Imperial Academy of Sciences, page 1071
  • Brückner, Aleksander (1927) , “tydzień”, in Słownik etymologiczny języka polskiego [Etymological Dictionary of the Polish Language] (in Polish), Warsaw: Wiedza Powszechna, published 1985, page 588
  • Melʹnyčuk O. S., editor (2006) , “тиждень”, in Etymolohičnyj slovnyk ukrajinsʹkoji movy [Etymological Dictionary of the Ukrainian Language] (in Ukrainian), volume 5, Kyjiv: Naukova Dumka, page 565