Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun The number 10 raised to the power googol, written out as the numeral 1 followed by 10^{100} zeros.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun cardinal The number , ten to the power of a
googol
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol)
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
Examples

Employees dubbed it the Googleplex, a pun on the mathematical term googolplex, meaning an unthinkably large number.

Employees dubbed it the Googleplex, a pun on the mathematical term googolplex, meaning an unthinkably large number.

If you don't know what 'googolplex' is, allow me to explain it to you.

If you don't know what 'googolplex' is, allow me to explain it to you.

If you don't know what 'googolplex' is, allow me to explain it to you.

If that's not mindboggling enough, a "googolplex" is a number with a googol number of zeros.

Cofounder Larry Page apparently misspelled the first half of "googolplex"  shorthand for a really big numberand, voila!

Cofounder Larry Page apparently misspelled the first half of "googolplex"  shorthand for a really big numberand, voila!

I think googolplex is good in Scrabble.

I was once charged a googolplex for a beer.
Comments
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oroboros commented on the word googolplex
10googol
October 8, 2007
thesuperiorbeing commented on the word googolplex
You see, Googol is a number with one hundred zero's (you know, a million has 6 zero's a hundred has 2... well this one has 100). But Googolplex is a number with GOOGOL zero's. Also, if you tried to write googolplex down (the number, not the word),  even if each digit was the size of an ATOM  then it wouldn't fit inside the UNIVERSE. Impressive, eh?
February 23, 2008
gangerh commented on the word googolplex
Great googolplexplanation, TSB.
February 24, 2008
thesuperiorbeing commented on the word googolplex
Why thank you, gangerh. And great pun!
February 24, 2008
seanahan commented on the word googolplex
Actually, mathematically speaking, you can view this number as tiny. Now Skewes number, that's freaking huge.
February 26, 2008
technologiez commented on the word googolplex
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July 10, 2010