Etymology

addendum

ad·den·dum
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Today it means: Something to be added; especially text added as an appendix or supplement to a document. Full definition →

Latin addendum ← Proto-Indo-European *dʰéh₁t ← Proto-Italic *ad-
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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. Latinaddendum
  9. English todayaddendum

Learned borrowing from Latin addendum, inflection of addendus (“annexed”), future passive participle of addō (“to add”).

Etymology from Wiktionary, CC BY-SA 4.0.