a person whose assets are worth at least a million of the standard monetary units of his or her country
WordReference Random House Learner's Dictionary of American English © 2025
mil•lion•aire or mil•lion•naire /ˌmɪlyəˈnɛr, ˈmɪlyəˌnɛr/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- one whose wealth amounts to a million or more in currency.
mil•lion•aire
(mil′yə nâr′),USA pronunciation n.
mil′lion•aire′dom, n.
- a person whose wealth amounts to a million or more in some unit of currency, as dollars.
- any very rich person.
- French millionnaire, equivalent. to million million + -aire -ary
- 1820–30
Collins Concise English Dictionary © HarperCollins Publishers::
'millionaire' also found in these entries (note: many are not synonyms or translations):
-aire
- Getty
- billionaire
- fairy tale
- get
- hay
- millionairess
- multimillionaire
- nonmillionaire
- oillionaire
- oneself
- repute
- sneaking