a person whose wealth amounts to a million or more in some unit of currency, as dollars.
any very rich person.
Also, millionnaire.

1820–30; < French millionnaire, equivalent to million million + -aire -ary

millionairedom, noun
nonmillionaire, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
millionaire or millionnaire (ˌmɪljəˈnɛə)
a person whose assets are worth at least a million of the standard monetary units of his country
millionnaire or millionnaire
million'airess or millionnaire
fem n
million'nairess or millionnaire
fem n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1826, from Fr. millionnaire (1762); see million. The first in America is said to have been John Jacob Astor (1763-1848).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Maybe you are some kind of millionaire who doesnt have to work for a living or something but the rest of us do.
Typically, he adopts the pose of a drunken millionaire who has green to burn.
The millionaire's surtax has cut through the clutter.
To media-savvy audiences, the illusion of having tea in some millionaire anchor's parlor is hokey.
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