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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.



exa-

prefix

  1. denoting 10 18 E

    exametres

“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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Word History and Origins

Origin of exa-1

Probably ≪ Greek exō- outside, out of

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