Period

By Kenny Agostinelli The period is the duration of one cycle in a repeating event.

The period is the reciprocal of the frequency. http://www.wikispaces.com/s/rte/images/textcolor.gif

The period of a wave is the time it takes for the wave to propagate through one full cycle. It is also the time it takes for any point in the medium to go through one complete cycle of the propagating disturbance
 * Period **