exa-

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exa-

pref.
1. One quintillion (1018): exahertz.
2. 1,152,921,504,606,846,976 (260): exabyte.

[Alteration of hexa- (from its representing the sixth power of a thousand).]
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.

exa-

prefix
denoting 1018: exametres. Symbol: E
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

exa-

a combining form used in the names of units of measure equal to one quintillion of a given base unit: exabyte.
[alter. of hexa-]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.