1. The abbreviation for Megahertz; a million cycles. See hertz. This term is often associated with the speed of a particular CPU or computer. 2. It is also known as the identification for frequency of radio or other types of signal transmissions. For example, a local “oldies” FM station in the Coachella Valley is KDES radio. It has an assigned FCC frequency of 104.7 mhz. It transmits on that frequency in its own local area with a maximum amount of power available to it under the license. This keeps stations from interfering with other station's signals most of the time.