Etymology

completion

com·ple·tion
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Today it means: The act or state of being or making something complete; conclusion, accomplishment. Full definition →

Latin completio ← Proto-Italic *plēō ← Proto-Indo-European *pleh₁-
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The story

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincon-
  6. Proto-Indo-European*pleh₁-
  7. Proto-Italic*plēō
  8. Latinpleō
  9. Latincompleō
  10. Latincompletio
  11. English todaycompletion

Learned borrowing from Latin completio. By surface analysis, complete + -tion.

Etymology from Wiktionary, CC BY-SA 4.0.