Zetta- Definition
 zetə 
    prefix
  
 One sextillion (1021 ).
 Zettahertz.
 American Heritage 
1,180,591,620,717,411,303,424 (270 ).
 Zettabyte.
 American Heritage 
    affix
  
 One sextillion; the factor 1021
 Zettabyte.
 Webster's New World 
Origin of Zetta-
-  From alteration of Latin septem seven (from its representing the seventh power of a thousand) septet From American Heritage Dictionary of the English Language, 5th Edition 
- prob. < It sette, seven, ult. < L septem: because the number is 1,000 to the seventh power - From Webster's New World College Dictionary, 5th Edition 
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