Where does “пятьдесят” come from?

пятьдесят (Russian) comes from Russian де́сять, from Old Church Slavonic десѧть, from Proto-Slavic desętь, from Proto-Balto-Slavic *déśimt, from Proto-Indo-European déḱm̥t — ten.

пятьдесят (Russian): fifty

Definitions

  1. fifty

Ancestry of “пятьдесят”, step by step

пятьдесят traces back through two separate lines of ancestry.

via Russian де́сять

StepLanguageWordMeaning
1Russianде́сятьten
2Old Church Slavonicдесѧтьten
3Proto-Slavicdesętьten
4Proto-Balto-Slavic*déśimtten
5Proto-Indo-Europeandéḱm̥tten

via Russian пять

StepLanguageWordMeaning
1Russianпятьfive; second-person singular imperative...
2Old Church Slavonicпѧтьfive
3Proto-Slavicpętьfive
4Proto-Indo-Europeanpénkʷefive

Words derived from “пятьдесят”

Every word from Proto-Indo-European déḱm̥t →Every word from Proto-Balto-Slavic *déśimt →Every word from Proto-Slavic desętь →