[ GLOSSARY DEFINITION ] General Terabyte One thousand gigabytes. Also known as: TB Full Definition & Technical Explanation Terabyte — One thousand gigabytes.This general term is part of the CompareTech technical dictionary and helps you read specifications, comparisons, and benchmark data across its device database.See also: Gigahertz Megahertz. Related Technical Terms Gigahertz One billion hertz — used for processor clocks. General Megahertz One million hertz. General ← All Glossary Terms How We Score → ← Previous Term Next Term →