quintillion [kwin-til-yuh n] Word Origin noun, plural quin·til·lions, (as after a numeral) quin·til·lion.
- a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros.
- amounting to one quintillion in number.
Origin of quintillion 1665–75; Latin quīnt(us)+ -illion (as in million)Related formsquin·til·lionth, noun, adjective British Dictionary definitions for quintillion quintillion noun plural -lions or -lion
- (in Britain, France, and Germany) the number represented as one followed by 30 zeros (10 30)US and Canadian word: nonillion
- (in the US and Canada) the number represented as one followed by 18 zeros (10 18)Former Brit word: trillion
Derived Formsquintillionth, adjectiveWord Origin for quintillion C17: from Latin quintus fifth + -illion, as in million Word Origin and History for quintillion n.
1670s, from Latin quintus “the fifth” (see) + ending from . Cf. . 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).