Where does “ketvirtadienis” come from?

ketvirtadienis (Lithuanian) comes from Lithuanian ketvirtas, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós — fourth.

ketvirtadienis (Lithuanian): Thursday

Definitions

  1. Thursday

Ancestry of “ketvirtadienis”, step by step

ketvirtadienis traces back through two separate lines of ancestry.

via Lithuanian ketvirtas

StepLanguageWordMeaning
1Lithuanianketvirtasfourth
2Proto-Balto-Slavicketwirtasfourth
3Proto-Indo-European*kʷetwr̥tósfourth

via Lithuanian diena

StepLanguageWordMeaning
1Lithuaniandienaday, daytime; day; day, time
2Proto-Balto-Slavicdein-—
Every word from Proto-Indo-European *kʷetwr̥tós →Every word from Proto-Balto-Slavic ketwirtas →Every word from Lithuanian ketvirtas →