[ GLOSSARY DEFINITION ] General Megahertz One million hertz. Also known as: MHz Full Definition & Technical Explanation Megahertz — One million hertz.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: Hertz Gigahertz. Related Technical Terms Gigahertz One billion hertz — used for processor clocks. General Hertz The unit of frequency — cycles per second. General ← All Glossary Terms How We Score → ← Previous Term Next Term →