Where does “plain” come from?

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

plain (Old French): full; plain; flat

Definitions

  1. full; plain; flat

Ancestry of “plain”, step by step

plain traces back through two separate lines of ancestry.

via Latin plēnus

StepLanguageWordMeaning
1Latinplēnusfull; filled; complete
2Proto-Italicplēnosfull
3Proto-Indo-Europeanpl̥h₁nósfull
4Proto-Indo-Europeanpleh₁-to fill

via Latin plānus

StepLanguageWordMeaning
1Latinplānuslevel, flat, even
2Ancient Greekπλάνοςwandering
3Ancient Greekπλανάωto make to wander, lead wandering about; to lead...
4Proto-Indo-Europeanpl-néh₂-ti

Words derived from “plain

Every word from Proto-Indo-European pleh₁-Every word from Proto-Indo-European pl̥h₁nósEvery word from Proto-Italic plēnos