Etymology

retardation

re·tar·da·tion
R1E1T1A1R1D2A1T1I1O1N1

Today it means: The distance by which one wave is behind another. Full definition →

Latin retardātiō ← Proto-Italic *tardos ← Proto-Indo-European *tr̥h₂dos
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The story

  1. Proto-Italic*wre-
  2. Latinre-
  3. Proto-Indo-European*terh₂-
  4. Proto-Indo-European*tr̥h₂dos
  5. Proto-Italic*tardos
  6. Latintardus
  7. Latinretardō
  8. Latinretardātiō
  9. English todayretardation

Learned borrowing from Latin retardātiō.

Etymology from Wiktionary, CC BY-SA 4.0.