Cycle

Cycle (Gk. kyklos, circle), anything round, but generally used in some special sense of a recurring in motion or time, for instance, the orbit of a planet, or a period after which the order of days recurs. Sometimes it means simply an age or lengthened period as in Tennyson's phrase, "Cycle of Cathay." The word is used in physics, in literature - to denote a set of tales or poems grouped around a certain event - and in botany. Among-well-known cycles are the Chinese, Chaldean, Solar, and Paschal cycles. As a verb, cycle meant to circle round, and the word has been applied to denote progression upon a bicycle or a tricycle.