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terabyte

[ter-uh-bahyt] /ˈtɛr əˌbaɪt/
noun, Computers.
1.
2 40 (1,099,511,627,776) bytes; 1024 gigabytes.
2.
(loosely) 10 12 or one trillion (1,000,000,000,000) bytes; 1000 gigabytes. Symbol: TB, TByte.
Origin
1980-1985
1980-85; tera- + byte
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for terabyte

terabyte

/ˈtɛrəˌbaɪt/
noun
1.
(computing) 1012 or 240 bytes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for terabyte
n.

by 1982, from tera- + byte.

Online Etymology Dictionary, © 2010 Douglas Harper
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terabyte in Science
terabyte
  (těr'ə-bīt')   
  1. A unit of computer memory or data storage capacity equal to 1,024 gigabytes (240 bytes).

  2. One trillion bytes. See Note at megabyte.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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terabyte in Technology

unit
(TB) 2^40 = 1,099,511,627,776 bytes = 1024 gigabytes or roughly 10^12 bytes.
(Note the spelling - one 'r'). See prefix.
(1995-09-29)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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