Cycle

An imaginary circle or orbit in the heavens; one of the celestial spheres.

An interval of time in which a certain succession of events or phenomena is completed, and then returns again and again, uniformly and continually in the same order; a periodical space of time marked by the recurrence of something peculiar; as, the cycle of the seasons, or of the year.

An age; a long period of time.

An orderly list for a given time; a calendar.

The circle of subjects connected with the exploits of the hero or heroes of some particular period which have served as a popular theme for poetry, as the legend of Arthur and the knights of the Round Table, and that of Charlemagne and his paladins.

One entire round in a circle or a spire; as, a cycle or set of leaves.

A bicycle or tricycle, or other light velocipede.

To pass through a cycle of changes; to recur in cycles.

To ride a bicycle, tricycle, or other form of cycle.

the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)

a periodically repeated sequence of events; "a cycle of reprisal and retaliation"