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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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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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