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bil·lion·air·ess | \ ¦bi(l)-yə-¦ner-əs 
\
\ plural billionairesses
Definition of billionairess
: a woman whose wealth is estimated at a billion or more dollars, pounds, or other monetary units Otto, by the way, had moved on from Buddhism to super-capitalism, had married a billionairess fifteen years his senior and was now a prominent figure both in Hollywood and on the Eurotrash party circuit.— Salman Rushdie, The Ground Beneath Her Feet, 2000
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Time Traveler for billionairess
The first known use of billionairess was in 1881
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