frequency the number of wavelengths, that what passed a point in one second of time
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Frequency is a measurement of how often a wave (such as a sound wave, light wave, or radio wave) repeats in a given amount of time. It is defined as the number of complete wavelengths that pass a fixed point in a given amount of time, usually one second. The unit of frequency is called the hertz (Hz), with one hertz equal to one cycle per second.