Etymology

ionisation

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English ionise ← Ancient Greek ἰόν (ión) ← Proto-Hellenic *éimi
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The story

  1. Proto-Indo-European*h₁ey-
  2. Proto-Indo-European*h₁éyti
  3. Proto-Hellenic*éimi
  4. Ancient Greekἰόν (ión)
  5. Englishion
  6. Englishionise
  7. English todayionisation

From ionise + -ation.

Etymology from Wiktionary, CC BY-SA 4.0.