billionaire.
Somebody whose wealth is at least one billion (10⁹) currency units (usually understood to exclude holders of hyperinflated currencies).
Meaning & usage
Somebody whose wealth is at least one billion (10⁹) currency units (usually understood to exclude holders of hyperinflated currencies).
Where this word comes from
Etymology tree Proto-Indo-European *dwóh₁ ▲ Proto-Indo-European *trísinflu. Proto-Indo-European *dwís Proto-Italic *dwis Old Latin duis Latin bisder. French bi- Proto-Indo-European *sem- Proto-Indo-European *sm̥- Proto-Indo-European *-is Proto-Indo-European *-h₂ Proto-Indo-European *-ih₂ Proto-Indo-European *smih₂ Proto-Indo-European *ǵʰes- Proto-Indo-European *-lom Proto-Indo-European *ǵʰéslom ▲ Proto-Indo-European *-ih₂ Proto-Indo-European *ǵʰéslih₂ Proto-Indo-European *smih₂ǵʰéslih₂ Proto-Italic *smīɣeslī Latin mīlle Italian mille Proto-Indo-European *-ōder. Proto-Indo-European *-Hōder.? Latin -ōnem Italian -one Italian milionebor. Old French million Middle French million French millionbf. French -illion French billionbor. English billion ▲ French million Proto-Indo-European *-yósder. Proto-Italic *-āzios Latin -āriusder. French -aire French millionnairebor. English millionaire English -aire English billionaire From billion + -aire.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.