Usage Note
Milliardaire refers to someone worth at least a billion (French milliard = one billion, not one million — a common false-friend trap for English speakers). The word can also be used as an adjective: un homme milliardaire. The feminine form is identical: une milliardaire.
Examples
"Ce milliardaire finance des projets écologiques."
Natural Translation
This billionaire funds ecological projects.
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