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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.
Another answer. Hertz is the SI unit for frequency. Frequency is defined as the number of cycles per second. The word cycles refers to a stated number of fully-completed wave transitions of: * a physical sound wave traveling through a solid (like wood or bone or metal), a fluid (like water), a gas (like air), etc.