supermillionaire

noun
su·​per·​mil·​lion·​aire | \ ˌsü-pər-ˌmi(l)-yə-ˈner How to pronounce supermillionaire (audio) , -ˈmi(l)-yə-ˌner\
plural supermillionaires

Definition of supermillionaire

: one whose wealth amounts to many millions (as of dollars or pounds) … the tax rate on the top 400 households in America—those with an average annual income of nearly $350 million—fell by more than a third. In fact, the tax rate for these supermillionaires is now less than the tax rate for average Americans.— Charles M. Blow

First Known Use of supermillionaire

1913, in the meaning defined above

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The first known use of supermillionaire was in 1913

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