• synonyms


[noh-nil-yuh n]
noun, plural no·nil·lions, (as after a numeral) no·nil·lion.
  1. a cardinal number represented in the U.S. by 1 followed by 30 zeros, and in Great Britain by 1 followed by 54 zeros.
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  1. amounting to one nonillion in number.
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Origin of nonillion

1680–90; < French, equivalent to non- (< Latin nōnus ninth) + -illion, as in million million
Related formsno·nil·lionth, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for nonillion


  1. (in Britain, France, and Germany) the number represented as one followed by 54 zeros (10 54)
  2. (in the US and Canada) the number represented as one followed by 30 zeros (10 30)Brit word: quintillion
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Derived Formsnonillionth, adjective, noun

Word Origin

C17: from French, from Latin nōnus ninth, 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