Usage Note
Millionnaire (double 'n') can be a noun (un millionnaire / une millionnaire) or an adjective (il est millionnaire). The form is the same for masculine and feminine when used as a noun; as an adjective it is invariable in its base form. Milliardaire ('billionaire') should not be confused with millionnaire — the distinction between the two is often blurred in English but is strictly maintained in French.
Examples
"Il est devenu millionnaire à trente ans."
Natural Translation
He became a millionaire at thirty.
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