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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.
View More. Definition: A harmonic frequency is a multiple of a fundamental frequency. A fundamental frequency of 500Hz has a first harmonic frequency of 1000Hz, double the fundamental frequency. Its second harmonic is 1500Hz, the third harmonic is 2000Hz and so on.