A unit of computer memory or data storage capacity equal to 1,024 gigabytes (240 bytes).
One trillion bytes.
terabyte unit 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)
(těr'ə-bīt') 