Definition from Wiktionary, the free dictionary
See also Quintillion
- (US, modern British & Australian, short scale) A billion billion: 1 followed by eighteen zeros, 1018.
- (dated, British & Australian, long scale) A million quadrillion: 1 followed by 30 zeros, 1030.
a billion billion, 1018
a million quadrillion, 1030
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See also 
quintillion (plural quintillions)
- See also Wikisaurus:zillion.
any very large number