Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One having an immense, incalculable amount of wealth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun humorous An incredibly rich person.

Etymologies

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

[zillion + (million)aire.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From zillion and modelled on millionaire

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