A person whose wealth equals two billion dollars or the currency equivalent.
From bi- (two) + million + -aire (French suffix for a person with a large amount of something). Created by analogy with millionaire and billionaire as wealth categories expanded.
Bimillionaire is technically the correct term for someone worth two billion, but billionaire is so dominant that you rarely hear it—language and economics collide when our number prefixes don't match how we count money!
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