Wordnet 3.0
NOUN (1)
1. 
 a unit of information equal to 1000 gigabits or 10^12 (1,000,000,000,000) bits; 
[syn: terabit, Tbit, Tb]
WordNet (r) 3.0 (2006):
terabit
    n 1: a unit of information equal to 1000 gigabits or 10^12
         (1,000,000,000,000) bits [syn: terabit, Tbit, Tb]