Etymology

arguably

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Today it means: As can be supported or proven by sound logical deduction, evidence, and precedent, but without absolute certainty. Full definition →

English arguable ← Middle English arguen ← Old French arguer
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The story

  1. Proto-Indo-European*h₂erǵ-
  2. Proto-Indo-European*h₂érǵus
  3. Proto-Italic*argusder.?
  4. Latinarguō
  5. Old Frencharguer
  6. Middle Englisharguen
  7. Englishargue
  8. Englisharguable
  9. English todayarguably

From arguable + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.