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billionaire

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Etymology and origin of the English word billionaire

Confidence
Established
Formation
Derivation
First attested
1841, Athenæum

Pronunciation

  • UK: /ˌbɪl.i.əˈnɛə(ɹ)/[1]
  • US: /ˌbɪl.jəˈnɛɚ/[1]

Etymology

It was formed in English on billion with the suffix -aire, after millionaire.[2][3][4][5][6] The OED compares French billionnaire, recorded slightly earlier, in 1839, but rare, the usual French word being milliardaire.[2]

Earliest recorded meaning

A person whose assets are worth a billion dollars, pounds or other units: 1841, in the Athenæum,[2] 1844 in American English according to Etymonline and Merriam-Webster.[3][4] Dictionary.com dates it to 1855–60 and marks it as an Americanism.[7]

Semantic evolution

Because billion long meant a million times a million in Britain but a thousand million in the United States, the value implied by the word depended on the country.[2] The Century Dictionary still marked it as rare in 1902,[3] and Etymonline thinks the first American billionaire was probably John D. Rockefeller, some time after the First World War.[3] The word is also used loosely for anyone extremely wealthy,[2] and as an adjective, as in billionaire investor, from 1865.[2]

Timeline

  • 1839 – billionnaire in French.[2]
  • 1841 – a person worth a billion.[2]
  • 1844 – American English use.[3][4]
  • 1865 – adjective use.[2]
  • 1902 – marked rare in the Century Dictionary.[3]

Modern meaning

Noun

  1. A person whose assets are worth at least a billion dollars, pounds or other units of currency.
  2. Loosely, an extremely wealthy person.
  • millionaire
  • billion
  • million
  • trillionaire
  • multimillionaire

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  6. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  7. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
Cite this entry

“Billionaire.” Etymologically, 22 Oct. 2026, etymologically.com/en/billionaire. Accessed 23 Oct. 2026.

Last edited on . ·