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hertz

The unit for frequency: one hertz is one back-and-forth per second.

The unit of frequency: one hertz is one full back-and-forth per second. Concert A is 440 hertz. Named after Heinrich Hertz, it turns the invisible speed of a vibration into a plain number you can dial.

Learn it: What is a note · Organizing time

The one-sentence definition at the top is the same one the Theory Aide extension shows as a tooltip inside Ableton Live. Hover any dotted term for its own.