Where does “plain” come from?

plain (French) comes from Old French plain, from Latin plēnus, from Proto-Italic plēnos, from Proto-Indo-European pl̥h₁nós, from Proto-Indo-European pleh₁- — to fill.

plain (French): plane

Definitions

  1. plane

Ancestry of “plain”, step by step

StepLanguageWordMeaning
1Old Frenchplainfull; plain; flat
2Latinplēnusfull; filled; complete
3Proto-Italicplēnosfull
4Proto-Indo-Europeanpl̥h₁nósfull
5Proto-Indo-Europeanpleh₁-to fill

Words derived from “plain

Every word from Proto-Indo-European pleh₁-