1. (US, modern British & Australian, short scale) A billion billion: 1 followed by eighteen zeros, 1018.
    • 2014, BBC News Magazine Monitor, Small Data: Those big numbers keep on coming ↗, BBC:
      Last week, we used...the BBC News website's biggest number: 9,223,372,036,854,775,808, that's 9.2 quintillion...[the maximum video viewer count on YouTube's] updated counter software.
  2. (dated, British & Australian, long scale) A million quadrillion: 1 followed by 30 zeros, 1030.
Synonyms Translations Translations Noun

quintillion (plural quintillions)

  1. (figuratively, slang, hyperbole) Any very large number, exceeding normal description.
Synonyms Translations

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