Where does “семъ” come from?

семъ (Old East Slavic) comes from Proto-Slavic sedmъ, from Proto-Balto-Slavic septmas, from Proto-Indo-European septḿ̥ — seven.

семъ (Old East Slavic): seventh

Definitions

  1. seventh

Ancestry of “семъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicsedmъseventh
2Proto-Balto-Slavicseptmas—
3Proto-Indo-Europeanseptḿ̥seven
Every word from Proto-Indo-European septḿ̥ →Every word from Proto-Balto-Slavic septmas →Every word from Proto-Slavic sedmъ →