From WordNet (r) 3.0 (2006):
terabyte
n 1: a unit of information equal to 1000 gigabytes or 10^12
(1,000,000,000,000) bytes [syn: terabyte, TB]
2: a unit of information equal to 1024 gibibytes or 2^40
(1,099,511,627,776) bytes [syn: terabyte, tebibyte, TB,
TiB]