RhymeZone: terabit definitions

Definitions of terabit:

noun: (computing) One trillion (10¹² = 1,000,000,000,000) bits, as opposed to a tebibit. Symbol: Tb.
noun: (computing, colloquial) 2⁴⁰ bits, a tebibit (Tib). Symbol: Tb

(Definitions from Wiktionary)