Etymology

rego

R1E1G2O1

Today it means: Registration for a motor vehicle. Full definition →

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

  1. Englishregister
  2. Englishregistration
  3. Latinō
  4. Old Frenchoh
  5. Middle Englisho
  6. EnglishO
  7. Middle Englisho
  8. Englishoh
  9. English todayrego

From registration + -o (diminutive suffix).

Etymology from Wiktionary, CC BY-SA 4.0.