noun an age; a long period of time.
2. cycle ·noun an orderly list for a given time; a calendar.
3. cycle ·noun a bicycle or tricycle, or other light velocipede.
4. cycle ·vi to ride a bicycle, tricycle, or other form of cycle.
5. cycle ·vi to pass through a cycle of changes; to recur in cycles.
6. cycle ·noun one entire round in a circle or a spire; as, a cycle or set of leaves.
7. cycle ·noun an imaginary circle or orbit in the heavens; one of the celestial spheres.
8. cycle ·add. ·noun a complete positive and negative wave of an alternating current; one period. the number of cycles (per second) is a measure of the frequency of an alternating current.
9. cycle ·noun 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.
10. cycle ·noun 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.
11. cycle ·add. ·noun a series of operations in which heat is imparted to (or taken away from) a working substance which by its expansion gives up a part of its internal energy in the form of mechanical work (or being compressed increases its internal energy) and is again brought back to its original state.