Usage Note
Miliardario functions as both a noun (il miliardario — the billionaire) and an adjective (un imprenditore miliardario — a billionaire entrepreneur). Italian miliardo = 1,000,000,000 (a billion in the short scale), so miliardario matches the English 'billionaire'. Do not confuse with milionario (millionaire). The feminine form is miliardaria.
Examples
"Il miliardario ha donato metà del suo patrimonio."
Natural Translation
The billionaire donated half of his fortune.

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