Etymology

whereon

W4H4E1R1E1O1N1

Today it means: On which, on what. Full definition →

Middle English wheron ← Old English on ← Proto-West Germanic *ana
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The story

  1. Proto-Indo-European*kʷ-
  2. Proto-Indo-European*kʷís
  3. Proto-Germanic*hwaz
  4. Proto-Germanic*hwar
  5. Proto-West Germanic*hwār
  6. Old Englishhwǣr
  7. Middle Englishwher
  8. Proto-Indo-European*h₂en-
  9. Proto-Germanic*an
  10. Proto-West Germanic*ana
  11. Old Englishon
  12. Middle Englishon
  13. Middle Englishwheron
  14. English todaywhereon

Inherited from Middle English wheron, from wher + on. Equivalent to where + on.

Etymology from Wiktionary, CC BY-SA 4.0.