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By Anne Marie Helmenstine, Ph.D. Definition: Frequency is the number of times a point on a wave passes a fixed reference point in one second. The SI unit for frequency is the Hertz (Hz). Also Known As: cycles per second.
1. Physics The number of complete cycles of a wave, such as a radio wave, that occur per second. See more at wave. 2. Mathematics The ratio of the number of occurrences of some event to the number of opportunities for its occurrence.. the state of being frequent; frequent occurrence. 2. the number of times that an event occurs within a given period; rate of recurrence. 3. (Mathematics) physics the number of times that a periodic function or vibration repeats itself in a specified time, often 1 second.