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(1)   The number of observations in a given statistical category
(2)   The ratio of the number of observations in a statistical category to the total number of observations
(3)   The number of occurrences within a given time period
"The frequency of modulation was 40 cycles per second"
"The frequency of his seizures increased as he grew older"


  1. The rate of occurrence of anything; the relationship between incidence and time period.
    • With growing confidence, the Viking’s raids increased in frequency.
    • The frequency of bus service has been improved from 15 to 12 minutes.
  2. The property of occurring often rather than infrequently.
    • The FAQ addresses questions that come up with some frequency.
    • The frequency of the visits was what annoyed him.
  3. The quotient of the number of times n a periodic phenomenon occurs over the time t in which it occurs: f = n / t.
    • The frequency of the musical note A above middle C is 440 oscillations per second.
    • The frequency of a wave is its velocity v divided by its wavelength \lambda: f = v / \lambda.
    • Broadcasting live at a frequency of 98.3 megahertz, we’re your rock alternative!
    • The frequency for electric power in the Americas is generally 60 Hz rather than 50.