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exa-

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exa-

a combining form used in the names of units of measure equal to one quintillion (1018) of a given base unit: exabyte.

Origin:
prob. ≪ Gk exō- outside, out of
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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exa-  
pref.  One quintillion (1018): exahertz.

[Alteration of hexa- (from its representing the sixth power of a thousand).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

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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Computing Dictionary

exa-
prefix

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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