[jil-yuh n]Informal.


an indefinitely vast number; zillion.


of or noting such a quantity: a jillion problems.

Origin of jillion

First recorded in 1940–45; expressive formation based on million, billion, etc.
Related formsjil·lionth, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for jillion

Contemporary Examples of jillion

British Dictionary definitions for jillion



informal an extremely large number or amountjillions of pounds
Derived Formsjillionth, adjective

Word Origin for jillion

C20: fanciful coinage based on million, billion, etc
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

Word Origin and History for jillion

by 1939, arbitrary coinage, modeled on million, etc.

Online Etymology Dictionary, © 2010 Douglas Harper