WordNet (r) 3.0 (2006):

exabyte
    n 1: a unit of information equal to 1000 petabytes or 10^18
         bytes [syn: exabyte, EB]
    2: a unit of information equal to 1024 pebibytes or 2^60 bytes
       [syn: exabyte, exbibyte, EB, EiB]

The Free On-line Dictionary of Computing (30 December 2018):

Exabyte

    A company and, by extension, a tape format for
   computer data backup and transfer.  The tape is a data quality 8mm
   video cassette recorder tape.  Exabyte units can store between
   five and fourteen gigabytes of data per tape.  Exabytes are
   usually attached to Unix workstations.

   [What different tape capacities exist?  Compare with DAT?]

   (1995-07-06)


The Free On-line Dictionary of Computing (30 December 2018):

exabyte

    (EB) A unit of data equal to 10^18 bytes but see
   binary prefix for other definitions.  An exabyte is exactly
   1000^6 bytes or 1000 petabytes.

   1000 exabytes are one zettabyte.

   See prefix.

   (2013-11-04)