Billionaire Definition

bĭlyə-nâr, bĭlyə-nâr
billionaires
noun
A person whose wealth amounts to at least a billion dollars, pounds, or the equivalent in other currency.
American Heritage
A person whose wealth comes to at least a billion dollars, pounds, francs, etc.
Webster's New World

Somebody whose wealth is greater than one billion (109) dollars, or other currency.

Wiktionary
Synonyms:

Other Word Forms of Billionaire

Noun

Singular:
billionaire
Plural:
billionaires

Origin of Billionaire

  • billion (million)aire

    From American Heritage Dictionary of the English Language, 5th Edition

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