Etymology

doco

D2O1C3O1
English oh ← Middle English o ← Old French oh
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The story

  1. Frenchdocumentaire
  2. Englishdocumentary
  3. Latinō
  4. Old Frenchoh
  5. Middle Englisho
  6. EnglishO
  7. Englishoh
  8. English todaydoco

From documentary + -o (“diminutive suffix”).

Etymology from Wiktionary, CC BY-SA 4.0.