Etymology

pretrained

P3R1E1T1R1A1I1N1E1D2

Today it means: Having been trained before. Full definition →

English pretrain ← Middle English trayne ← Old French train
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The story

  1. Proto-Indo-European*per-
  2. Proto-Indo-European*preh₂-
  3. Proto-Indo-European*préh₂i?
  4. Proto-Italic*prai
  5. Proto-Italic*prai-
  6. Latinprae-
  7. Middle Englishpre-
  8. Englishpre-
  9. Proto-Indo-European*dʰregʰ-der.?
  10. Latintrahere
  11. Vulgar Latin*tragīnāre
  12. Old Frenchtraïner
  13. Old Frenchtrain
  14. Middle Englishtrayne
  15. Englishtrain
  16. Englishtrained
  17. Englishpre-
  18. Englishtrain
  19. Englishpretrain
  20. English todaypretrained

From pre- + trained, or from pretrain + -ed.

Etymology from Wiktionary, CC BY-SA 4.0.