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[free-kwuh n-see] /ˈfri kwən si/

noun, plural frequencies.
Also, frequence. the state or fact of being frequent; frequent occurrence:
We are alarmed by the frequency of fires in the neighborhood.
rate of occurrence:
The doctor has increased the frequency of his visits.

Mathematics. the number of times a value recurs in a unit change of the independent variable of a given function.
Statistics. the number of items occurring in a given category.
noun (pl) -cies
the state of being frequent; frequent occurrence
the number of times that an event occurs within a given period; rate of recurrence
(physics) the number of times that a periodic function or vibration repeats itself in a specified time, often 1 second. It is usually measured in hertz ν, f



1530s, from French fréquence, from Latin frequentia (see frequent).

1640s, “fact of occurring often,” from Latin frequentia “a crowding, crowd,” from frequentem (see frequent).

Earlier it had been used in a now-obsolete sense of “state of being crowded” (mid-16c.); sense in physics, “rate of recurrence,” especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.).

In physics, the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz), corresponding to one crest per second. The frequency of a wave can be calculated by dividing the speed of the wave by the wavelength. Thus, in the electromagnetic spectrum, the wavelengths decrease as the frequencies increase, and vice versa.


Read Also:

  • Frequency-band

    noun, Radio and Television. 1. 2 (def 9). noun 1. a continuous range of frequencies, esp in the radio spectrum, between two limiting frequencies

  • Frequency-curve

    noun, Statistics. 1. a curve representing the frequency with which a variable assumes its values.

  • Frequency-distribution

    noun, Statistics. 1. the correspondence of a set of frequencies with the set of categories, intervals, or values into which a population is classified. noun 1. (statistics) the function of the distribution of a sample corresponding to the probability density function of the underlying population and tending to it as the sample size increases, the […]

  • Frequency division multiple access

    frequency division multiplexing

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