|1.||[ noun ] (physics) the number of occurrences within a given time period (usually 1 second)|
"the frequency of modulation was 40 cycles per second"
|Related terms:||rate infrared wave_number count_per_minute radio_frequency sampling_frequency audio|
|2.||[ noun ] (statistics) the ratio of the number of observations in a statistical category to the total number of observations|
|Related terms:||ratio incidence|
|3.||[ noun ] (mathematics) the number of observations in a given statistical category|