from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One whose financial assets are worth several million dollars.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a person worth many millions of dollars, pounds or some other currency
from The Century Dictionary and Cyclopedia
- n. One who possesses property worth several million dollars (or pounds, or francs, etc.).
multi- + millionaire (Wiktionary)