#frequency__frequence__oftenness__oftennes  the number of occurrences within a given time period (usually 1 second); "the frequency of modulation was 40 cycles 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"
  subtype:  #audio_frequency__audiofrequency__audio  an audible acoustic wave frequency
  subtype:  #radio_frequency__radiofrequency  an electromagnetic wave frequency between audio and infrared
     subtype:  #extremely_low_frequency__extremelylowfrequency__ELF  below 3 kilohertz
     subtype:  #very_low_frequency__VLF  3 to 30 kilohertz
     subtype:  #low_frequency__lowfrequency__LF  30 to 300 kilohertz
     subtype:  #medium_frequency__MF  300 to 3000 kilohertz
     subtype:  #high_frequency__HF  3 to 30 megahertz
     subtype:  #very_high_frequency__VHF  30 to 300 megahertz
     subtype:  #ultrahigh_frequency__ultrahighfrequency__UHF  300 to 3000 megahertz
     subtype:  #superhigh_frequency__superhighfrequency__SHF  3 to 30 gigahertz
     subtype:  #extremely_high_frequency__EHF  30 to 300 gigahertz
  subtype:  #infrared_frequency__infrared  the infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range; "they could sense radiation in the infrared"
  subtype:  #wave_number  the reciprocal of the wavelength of a wave
     subtype:  #rydberg_constant__rydbergconstant__rydberg__rydberg_unit__rydbergunit  a wave number characteristic of the wave spectrum of each element
  subtype:  #count_per_minute__countperminute__counts/minute  frequency per minute
  subtype:  #sampling_frequency  (telecommunications) the frequency of sampling a continuously varying signal
     subtype:  #Nyquist_frequency  (telecommunications) twice the maximum frequency occurring in the transmitted signal

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