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exa-

1.
a combining form used in the names of units of measure equal to one quintillion (10 18) of a given base unit:
exabyte.
Origin
probably ≪ Greek exō- outside, out of
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for exa

exa-

prefix
1.
denoting 1018: exametres, E
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
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exa in Medicine

exa- pref.
One quintillion (1018): exagram.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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