Definition of milliardaire in English:

milliardaire

noun

rare
  • A person possessing a thousand million pounds (dollars, etc.); an immensely wealthy person.

Origin

Late 19th century; earliest use found in Francis Edgeworth (1845–1926), economist and statistician. From milliard + -aire, in quot. 1897 after Dutch milliardair, itself probably after French milliardaire.

Pronunciation

milliardaire

/ˌmɪlɪəˈdɛː/