Where does “si” come from?

si (Walloon) comes from Old French si, from Latin sī, from Proto-Italic sei, from Proto-Indo-European só — this; that.

si (Walloon): if

Definitions

  1. if

Ancestry of “si”, step by step

StepLanguageWordMeaning
1Old Frenchsiso; thus; in such a way; Alternative form of se
2Latinsīif, supposing that
3Proto-Italicseiso, thus
4Proto-Indo-Europeansóthis; that
Every word from Proto-Indo-European só →Every word from Proto-Italic sei →Every word from Latin sī →
si — Etymology, Origin & Word History | Etymology Explorer