Etymology
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cycle (n.)

late 14c., cicle, "perpetual circulating period of time, on the completion of which certain phenomena return in the same order," especially and originally in reference to astronomical phenomena, from Old French cicle and directly from Late Latin cyclus, from Greek kyklos "circle, wheel, any circular body," also "circular motion, cycle of events," from PIE kw(e)-kwl-o-, a suffixed, reduplicated form of the root *kwel- (1) "to revolve, move round."

From 1660s as "any recurring round of operations or events" (as in life cycle). From 1821 as "single complete period in a cycle." Extended by 1842 to "any long period of years, an age." In literary use, "the aggregate of the legends or traditions around some real or mythical event or character" (1835).

By 1884 as "recurring series of oscillations or operations in an engine, etc." From 1870 as short for motorcycle; by 1881 as short for bicycle or tricycle.

cycle (v.)

1842, "revolve in cycles, occur or recur in cycles," from cycle (n.). Meaning "to ride a bicycle" is by 1881 (implied in cycling). Related: Cycled.

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Definitions of cycle
1
cycle (n.)
an interval during which a recurring sequence of events occurs;
the never-ending cycle of the seasons
Synonyms: rhythm / round
cycle (n.)
a series of poems or songs on the same theme;
Schubert's song cycles
cycle (n.)
a periodically repeated sequence of events;
a cycle of reprisal and retaliation
cycle (n.)
the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz);
Synonyms: hertz / Hz / cycle per second / cycles/second / cps
cycle (n.)
a single complete execution of a periodically repeated phenomenon;
a year constitutes a cycle of the seasons
Synonyms: oscillation
cycle (n.)
a wheeled vehicle that has two wheels and is moved by foot pedals;
Synonyms: bicycle / bike / wheel
2
cycle (v.)
cause to go through a recurring sequence;
cycle the laundry in this washing program
cycle (v.)
pass through a cycle;
This machine automatically cycles
cycle (v.)
ride a motorcycle;
Synonyms: motorbike / motorcycle
cycle (v.)
ride a bicycle;
Synonyms: bicycle / bike / pedal / wheel
cycle (v.)
recur in repeating sequences;
From wordnet.princeton.edu