One million hertz, or cycles per second. (See Hertz.)
Used to describe the frequency of a crystal or oscillator in terms of millions of Hertz (cycles per second). A frequency specified as "10.0 MHz" would be understood as being a frequency of 10,000,000 Hertz (cycles per second).
A measure of electromagnetic wave frequency equal to one million (1,000,000) hertz, often abbreviated as MHz and used to specify the radio frequency used by wireless devices.