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What is "quintillion"

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quintillion
Douglas Harper's Etymology Dictionary
quintillion

1670s, from Latin quintus "the fifth" (see quinque-) + ending from million. Compare billion. In Great Britain, the fifth power of a million (1 followed by 30 zeroes); in U.S. the sixth power of a thousand (1 followed by 18 zeroes).

Wiktionary
quintillion

n. (context figuratively slang English) Any very large number, exceeding normal description. num. 1 (context US modern British & Australian, http://en.wikipedia.org/wiki/Long%20and%20short%20scales English) A billion billion: 1 followed by eighteen zeros, 1018. 2 (context dated British & Australian, http://en.wikipedia.org/wiki/Long%20and%20short%20scales English) A million quadrillion: 1 followed by 30 zeros, 1030.

WordNet
quintillion

n. the number that is represented as a one followed by 18 zeros

Usage examples of "quintillion".

It could also be eighteen billion trillion quadrillion quintillion whatever-you-like years ago.

He deemed it cheap to retreat to such sophistry when the noble adventure could be justified within its own terms: man had thrown back the perimeters of ignorance and darkness by quintillions of miles and centuries of years, and that was adequate justification.