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  1. The number of times something is repeated. In acoustics, it refers to the number of complete sound waves that pass a given point in a given time. Usually measured in Hertz (one cycle per second). Typically refers to the pitch of a sound, how high or low it is. The higher the number, the higher the pitch. Source: Church Audio & Acoustics Glossary
  2. For a function periodic in time, the reciprocal of the period. Unit, hertz (Hz). Source: Glossary of Terms in Noise Control Engineering
  3. The measure of the rapidity of alterations of a periodic signal, expressed in cycles per second or Hz. Source: http://www.owenscorning.com/around/sound/glossary.asp