goo·gol·plex (go?o?gôl-pl?ks?)n. The number 10 raised to the power googol, written out as the numeral 1 followed by 10100 zeros.[googol + -plex (as in duplex).]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.googolplex (??u???l?pl?ks; -??l-) n (Mathematics) the number represented as one followed by a googol (10100) of zeros[C20: from googol + (du)plex]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014goo?gol?plex (?gu g?l?pl?ks) n. a number that is equal to 1 followed by a googol of zeros, expressed as 10^googol. [1935?40] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.