Etymology
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quintillion (n.)

1670s, from Latin quintus "the fifth" (from PIE root *penkwe- "five") + 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).

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Definitions of quintillion

quintillion (n.)
the number that is represented as a one followed by 18 zeros;
From wordnet.princeton.edu