- a cardinal number represented in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.
- amounting to one quadrillion in number.
Origin of quadrillion
1665–75; quadr- + -illion (as in million)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for quadrillion
At this rate of growth from a single cholera bacillus sixteen quadrillion might arise in a single day.Disease and Its Causes</p>
William Thomas Councilman
Quadrillion, kwod-ril′yun, n. a million raised to the fourth power, represented by a unit with twenty-four ciphers.
"Three quadrillion times, my son," replied his father with perfect accuracy and a spirit of hourly freshness.The Kentucky Warbler</p>
James Lane Allen
For the enormous majority of us there is no difference in this respect between a hundred and a quadrillion.Getting Married
George Bernard Shaw
Their velocity was six hundred and sixty quadrillion miles per second!Invaders from the Infinite</p>
John Wood Campbell
- (in Britain) the number represented as one followed by 24 zeros (10 24)US and Canadian word: septillion
- (in the US and Canada) the number represented as one followed by 15 zeros (10 15)
- amounting to this numbera quadrillion atoms
- (as pronoun)a quadrillion
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 quadrillion
Online Etymology Dictionary, © 2010 Douglas Harper