Etymology

addition

ad·di·tion
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Today it means: The act of adding anything. Full definition →

Middle English addicioun ← Old French adition ← Latin additiō
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The story

  1. Proto-Indo-European*h₂éd
  2. Proto-Italic*ad
  3. Proto-Italic*ad-
  4. Latinad-
  5. Proto-Indo-European*dʰeh₁-
  6. Proto-Indo-European*dʰéh₁t
  7. Latinaddō
  8. Latinadditiō
  9. Old Frenchadition
  10. Middle Englishaddicioun
  11. English todayaddition

Sense of “what is added” dates from 14th century, from Middle English addicioun, addition, from Old French adition, from Latin additiōnem, accusative singular of additiō, from addō (“add, put”).

Etymology from Wiktionary, CC BY-SA 4.0.