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1. One quintillion (1018): exahertz.
2. 1,152,921,504,606,846,976 (260): exabyte.
[Alteration of hexa- (from its representing the sixth power of a thousand).]
denoting 1018: exametres. Symbol: E
a combining form used in the names of units of measure equal to one quintillion of a given base unit: exabyte.
[alter. of hexa-]