Where does “plane” come from?

Plane comes from Latin planum, derived from Latin planus, which traces to Ancient Greek πλάνος, ultimately from Proto-Indo-European pleth₂- meaning broad or flat.

plane (English): Of a surface: flat or level; A level or flat...

Definitions

  1. Of a surface: flat or level; A level or flat...

Ancestry of “plane”, step by step

plane traces back through 3 separate lines of ancestry.

via Middle English plane

StepLanguageWordMeaning
1Middle Englishplane
2Old Frenchplane
3Latinplatanusplanetree, sycamore
4Greekπλάτανοςplane tree
5Ancient Greekπλάτανοςplanetree
6Ancient Greekπλατύςwide, broad; flat, level; broad-shouldered
7Proto-Indo-Europeanpléth₂usflat, broad
8Proto-Indo-Europeanpleth₂-flat

via English aeroplane

StepLanguageWordMeaning
1EnglishaeroplaneA powered heavier-than-air aircraft with fixed...
2Frenchaéroplaneaeroplane
3Ancient Greekᾱ̓ερόπλᾰνοςwandering in air

via Latin plānum

StepLanguageWordMeaning
1Latinplānuma plain, level ground

Words derived from “plane

Every word from Proto-Indo-European pleth₂-
plane — Etymology, Origin & Word History | Etymology Explorer