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quadrillion

[kwo-dril-yuh n]
noun, plural quad·ril·lions, (as after a numeral) quad·ril·lion.
  1. a cardinal number represented in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.
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adjective
  1. amounting to one quadrillion in number.
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Origin of quadrillion

1665–75; quadr- + -illion (as in million)
Related formsquad·ril·lionth, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for quadrillionth

Historical Examples

  • But as this gives something like one thousand quadrillionth part of the density of water, we refuse to accept or even think of it.

    New Theories in Astronomy

    Willam Stirling


British Dictionary definitions for quadrillionth

quadrillion

noun
  1. (in Britain) the number represented as one followed by 24 zeros (10 24)US and Canadian word: septillion
  2. (in the US and Canada) the number represented as one followed by 15 zeros (10 15)
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determiner
    1. amounting to this numbera quadrillion atoms
    2. (as pronoun)a quadrillion
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Derived Formsquadrillionth, adjective

Word Origin

C17: from French quadrillon, from quadri- + -illion, on the model of million
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for quadrillionth

quadrillion

n.

1670s, from French quadrillion (16c.) from quadri- "four" (see quadri-) + (m)illion. Cf. billion. In Great Britain, the fourth power of a million (1 followed by 24 zeroes); in the U.S., the fifth power of a thousand (1 followed by 15 zeroes).

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Online Etymology Dictionary, © 2010 Douglas Harper