The repeat time for an alternating voltage or current wave. During one cycle, a single wave is completed. A cycle can also be measured in electrical degrees, with 360° equal to one cycle. The higher the frequency of an electrical wave, the shorter the cycle. For harmonic waves, the higher the harmonic number, the shorter the cycle, or the greater the number of complete harmonic cycles in one fundamental cycle. For a “60Hz” or “60 Cycle” distribution system, one cycle lasts 1/60 of a second (16ms). (see: Alternating Current; Fundamental; Hertz; Harmonic Number; Frequency.)