- a cardinal number represented in the U.S. by 1 followed by 30 zeros, and in Great Britain by 1 followed by 54 zeros.
- amounting to one nonillion in number.
Origin of nonillion
1680–90; < French, equivalent to non- (< Latin nōnus ninth) + -illion, as in million million
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- (in Britain, France, and Germany) the number represented as one followed by 54 zeros (10 54)
- (in the US and Canada) the number represented as one followed by 30 zeros (10 30)Brit word: quintillion
C17: from French, from Latin nōnus ninth, on the model of million