frequency
• noun the number of repetitions per unit time of a complete waveform such as an electric or sound wave
• noun the probability of a item occurring in a sample
• noun the number of occurrences of something in a group or sample
• prefix one thousandth of a million millionth (10-15).
• The number of waves of radiation of a particular wavelength passing a fixed point per second. The unit of frequency is the Hertz, one per second. The frequency of a signal multiplied by its wavelength equals its velocity, so that electromagnetic radiation of one metre wavelength must have a frequency of 300,000,000 hertz, or 300MHz, since all electromagnetic radiation has a velocity of 300,000 km per second in empty space. The same principle applies to other forms of wave energy like seismic waves and vibrations in interstellar gas clouds.
• For a periodic phenomenon, the number of complete cycles per unit of time. When the unit of time is one second, the unit of frequency is the hertz. That is, 1 complete cycle per second is 1 Hz. Various multiples of hertz are frequently encountered in electronics, including kilo-hertz, megahertz, gigahertz, and so on. Examples of periodic phenomena include electromagnetic waves, sound waves, and AC. It is the reciprocal of period (2). Its symbol is f, or v, and its abbreviation is freq.
• symbol f

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