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[zil-yuh n]Informal.
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noun, plural zil·lions, (as after a numeral) zil·lion.
  1. an extremely large, indeterminate number.
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  1. of, relating to, or amounting to a zillion.
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Origin of zillion

First recorded in 1930–35; jocular alteration of million, billion, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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  • There were about a zillion startups who were trying to make a buck on the Xnet.

    Little Brother

    Cory Doctorow

British Dictionary definitions for zillion


noun plural -lions or -lion
  1. (often plural) an extremely large but unspecified number, quantity, or amountzillions of flies in this camp
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    1. amounting to a zilliona zillion different problems
    2. (as pronoun)I found a zillion under the sink
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Word Origin

C20: on the model of 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

Word Origin and History for zillion


1944, arbitrary coinage with no definite numerical value; first recorded in Damon Runyon.

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Online Etymology Dictionary, © 2010 Douglas Harper