n-see]
| 1. | Also, frequence. the state or fact of being frequent; frequent occurrence: We are alarmed by the frequency of fires in the neighborhood. |
| 2. | rate of occurrence: The doctor has increased the frequency of his visits. |
| 3. | Physics.
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| 4. | Mathematics. the number of times a value recurs in a unit change of the independent variable of a given function. |
| 5. | Statistics. the number of items occurring in a given category. |
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.