Quadrillion (noun)

A number equal to 1 followed by 15 zeroes; 10^15.

Origin:

Late 18th century: from french, from quadri- (from latin quattuor "four") + -illion (from million).

Examples:

  1. It's hard to imagine a quadrillion of anything.
  2. The national debt is measured in trillions, not quadrillions.
  3. The number of stars in the universe is estimated to be around 10^22, or one sextillion.
  4. A quadrillion dollars is an enormous amount of money.
  5. The number of atoms in a mole of a substance is Avogadro's number, which is 6.022 x 10^23, or six sextillion.
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