#megahertz__MHz__megacycle_per_second__megacyclepersecond__megacycle__Mc  one million periods per second
  supertype:  rate  a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"
  part:  kilohertz__khz__kilocycle_per_second__kilocyclepersecond__kilocycle__kc  one thousand periods per second
     part:  Hertz__Hz__cycle_per_second__cyclepersecond__cycles/second__cps__cp__cycle  the unit of frequency; one Hertz has a periodic interval of one second

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