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Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Informal One having an immense, incalculable amount of wealth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An incredibly rich person.

Etymologies

zillion + (million)aire.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From zillion and modelled on millionaire (Wiktionary)

Examples

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