/ Dictionary / Index M millionaire: Meaning and Definition of Find definitions for: mil•lion•aire Pronunciation: (mil"yu-nâr'), [key] — n. a person whose wealth amounts to a million or more in some unit of currency, as dollars. any very rich person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: millionaire (Thesaurus) million millionairess Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language