Etymology

milliardaire

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Today it means: A billionaire; somebody whose wealth is greater than one milliard (10⁹) dollars, or other currency. Full definition →

French milliardaire
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The story

  1. French · borrowed frommilliardaire“milliardaire, billionaire”
  2. English todaymilliardaire

From French milliardaire (“milliardaire, billionaire”). Equivalent to milliard + -aire.

Etymology from Wiktionary, CC BY-SA 4.0.