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quadrillion

[kwo-dril-yuh n] /kwɒˈdrɪl yən/
noun, plural quadrillions (as after a numeral) quadrillion.
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.
adjective
2.
amounting to one quadrillion in number.
Origin
1665-1675
1665-75; quadr- + -illion (as in million)
Related forms
quadrillionth, noun, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for quadrillions

quadrillion

/kwɒˈdrɪljən/
noun
1.
(in Britain) the number represented as one followed by 24 zeros (1024) US and Canadian word septillion
2.
(in the US and Canada) the number represented as one followed by 15 zeros (1015)
determiner
3.
  1. amounting to this number: a quadrillion atoms
  2. (as pronoun): a quadrillion
Derived Forms
quadrillionth, 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
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Word Origin and History for quadrillions

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).

Online Etymology Dictionary, © 2010 Douglas Harper
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