[ GLOSSARY DEFINITION ] General Megabyte One million bytes. Also known as: MB Full Definition & Technical Explanation Megabyte — One million bytes.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: Megahertz Terabyte. Related Technical Terms Megahertz One million hertz. General Terabyte One thousand gigabytes. General ← All Glossary Terms How We Score → ← Previous Term Next Term →