Dictionary.com

quintillion

[ kwin-til-yuhn ]
/ kwɪnˈtɪl yən /

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.

adjective

amounting to one quintillion in number.

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Origin of quintillion

1665–75; <Latin quīnt(us) fifth + -illion (as in million)

OTHER WORDS FROM quintillion

quin·til·lionth, noun, adjective

Words nearby quintillion

quintessential, quintet, quintic, quintile, Quintilian, quintillion, quintuple, quintuplet, quintuplex, quintuplicate, quinze
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for quintillion

quintillion
/ (kwɪnˈtɪljən) /

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 forms of quintillion

quintillionth, adjective

Word Origin for quintillion

C17: from Latin quintus fifth + -illion, as in million
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012