Where does “se(d)” come from?

se(d) (Late Latin) comes from Latin si, from Proto-Italic sei, from Proto-Indo-European só — this; that.

Ancestry of “se(d)”, step by step

StepLanguageWordMeaning
1Latinsiif, supposing that; whether
2Proto-Italicseiso, thus
3Proto-Indo-Europeansóthis; that

Words derived from “se(d)”

Every word from Proto-Indo-European só →Every word from Proto-Italic sei →Every word from Latin si →