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billionaire

[bil-yuh-nair, bil-yuh-nair] /ˌbɪl yəˈnɛər, ˈbɪl yəˌnɛər/
noun
1.
a person who has assets worth a billion or more dollars, francs, pounds, or the like.
Origin
1855-1860
1855-60, Americanism; billion + -aire, on the model of millionaire
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for billionaires

billionaire

/ˌbɪljəˈnɛə/
noun
1.
a person whose assets are worth over a billion of the monetary units of his country
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for billionaires

billionaire

n.

1844, American English, from billion on model of millionaire. The first in the U.S. likely was John D. Rockefeller (1839-1937), some time after World War I.

Online Etymology Dictionary, © 2010 Douglas Harper
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