Definition of multibillionaire in US English:

multibillionaire

noun

  • A person with assets worth several or many billions (of pounds, dollars, etc.).

Origin

Early 20th century; earliest use found in ‘Mark Twain’ (1835–1910), author and lecturer (real name Samuel Langhorne Clemens). From multi- + billionaire.

Pronunciation

multibillionaire

/ˌmʌltɪˌbɪljəˈnɛː/