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Noun: jillion  jil-yun [N. Amer], ji-lee-un [Brit]
  1. A very large indefinite number (usually hyperbole)
    "there were jillions of flies";
    - million, billion, trillion, zillion, gazillion, squillion, bazillion [N. Amer]

Derived forms: jillions

Type of: large indefinite amount, large indefinite quantity

Encyclopedia: Jillion