Definition of millionaire
: a person whose wealth is estimated at a million or more (as of dollars or pounds)
Origin and Etymology of millionaire
French millionnaire, from million, from Middle French milion
First Known Use: 1786
MILLIONAIRE Defined for English Language Learners
Definition of millionaire for English Language Learners
: a rich person who has at least a million dollars, pounds, etc.
MILLIONAIRE Defined for Kids
Definition of millionaire for Students
: a person having a million dollars or more
Seen and Heard
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