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1. One sextillion (1021): zettahertz.
2. 1,180,591,620,717,411,303,424 (270): zettabyte
[From alteration of Latin septem, seven (from its representing the seventh power of a thousand); see septet.]
a combining form used in the names of units of measure equal to one sextillion of a given base unit: zettabyte.
[alter. of Greek zêta, sixth letter of the Greek alphabet (z is the last letter of the Latin alphabet)]