Quintillion

[kwin-til-yuh n] /kwɪnˈtɪl yən/

noun, plural quintillions (as after a numeral) quintillion.
1.
a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros.
adjective
2.
amounting to one quintillion in number.
/kwɪnˈtɪljən/
noun (pl) -lions, -lion
1.
(in Britain, France, and Germany) the number represented as one followed by 30 zeros (1030) US and Canadian word nonillion
2.
(in the US and Canada) the number represented as one followed by 18 zeros (1018) Former Brit word trillion
n.

1670s, from Latin quintus “the fifth” (see quinque-) + ending from million. Cf. 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).

10^30 in Europe (this is called a nonillion in the United States and Canada).
10^18 in the United States and Canada (this is called a trillion in Europe).
[Collins dictionary].

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