mhz

n. one million oscillations per second

The hertz (symbol: Hz) is the SI unit of frequency. Its base unit is cycle/s or s-1 (also called inverse seconds, reciprocal seconds). In English, hertz is used as both singular and plural. As any SI unit, Hz can be prefixed; commonly used multiples are kHz (kilohertz, 103 Hz), MHz (megahertz, 106 Hz), GHz (gigahertz, 109 Hz) and THz (terahertz, 1012 Hz).
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Noun
1. one million periods per second
(synonym) megahertz, megacycle per second, megacycle, Mc
(hypernym) rate
(part-meronym) kilohertz, kHz, kilocycle per second, kilocycle, kc

megahertz, million hertz, megacycle (Physics, Electronics)

short waves, electromagnetic waves for radio transmissions that are less than 150 meters