Dictionary:Period (T)

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1. The time T for one cycle. The time for a wavecrest to transverse a distance equal to one wavelength, or the time for two successive wavecrests to pass a fixed point. For a monochromatic wavetrain,

where f=frequency, =wavelength, and V=phase velocity. See Figure W-2.

2. A major standard geochronologic time unit; see stratigraphic classification and Appendix I.