Definition of cycles:
(n) :
A process that returns to its beginning and then repeats itself in the same sequence.
(n) :
An interval of space or time in which one set of events or phenomena is completed.
(n) :
A complete rotation of anything.
(n) :
A pedal-powered vehicle, such as a unicycle, bicycle, or tricycle, or a motorized vehicle that has either two or three wheels.
(v) :
To ride a bicycle or other cycle.
(v) :
To go through a cycle or to put through a cycle.