terabyte

[ter-uh-bahyt]
noun Computers.
  1. 240 (1,099,511,627,776) bytes; 1024 gigabytes.
  2. (loosely) 1012 or one trillion (1,000,000,000,000) bytes; 1000 gigabytes. Symbol: TB, TByte.

Origin of terabyte

First recorded in 1980–85; tera- + byte
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for terabyte

terabyte

noun
  1. computing 10 12 or 2 40 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

Word Origin and History for terabyte
n.

by 1982, from tera- + byte.

Online Etymology Dictionary, © 2010 Douglas Harper

terabyte in Science

terabyte

[tĕrə-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.