Exa- Definition
eksə, egzə
prefix
One quintillion (1018 ).
Exahertz.
American Heritage
1,152,921,504,606,846,976 (260 ).
Exabyte.
American Heritage
affix
One quintillion; the factor 1018
Exajoule.
Webster's New World
Origin of Exa-
Alteration of hexa– (from its representing the sixth power of a thousand)
From American Heritage Dictionary of the English Language, 5th Edition
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