frequency, frequence, oftenness (noun)

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"

frequency, relative frequency (noun)

the ratio of the number of observations in a statistical category to the total number of observations

frequency, absolute frequency (noun)

the number of observations in a given statistical category

frequency (Noun)

The rate of occurrence of anything; the relationship between incidence and time period.

frequency (Noun)

The property of occurring often rather than infrequently.

frequency (Noun)

The quotient of the number of times a periodic phenomenon occurs over the time in which it occurs: .

Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period is half a second.

Frequency

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity, and is distinct from angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the interval of time between events, so the period is the reciprocal of the frequency.For example, if a heart beats at a frequency of 120 times a minute (2 hertz), the period, T—the interval at which the beats repeat—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.