Definitions for exa-
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Random House Webster's College Dictionary
exa-
a combining form used in the names of units of measure equal to one quintillion of a given base unit:
exabyte.
Origin of exa-:
alter. of hexa-
Wiktionary
exa-(Prefix)
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10. Symbol: E
Origin: From ἕξ, for the sixth order of 10.
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