Etymology
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millionaire (n.)

"a person worth a million dollars, pounds, francs, etc.," 1821, from French millionnaire (1762); see million. The first in America is said to have been John Jacob Astor (1763-1848).

updated on January 19, 2019

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Definitions of millionaire from WordNet

millionaire (n.)
a person whose material wealth is valued at more than a million dollars;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.