billionaire

bil·lion·aire

noun \ˌbi(l)-yə-ˈner, ˈbi(l)-yə-ˌ\

Definition of BILLIONAIRE

: one whose wealth is estimated at a billion or more (as of dollars or pounds)

Origin of BILLIONAIRE

billion + -aire (as in millionaire)

First Known Use: 1844

Rhymes with BILLIONAIRE

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