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A cycle ( Latin "cyclus," from Greek "kuklos" meaning Circle ) is anything round, in the physical sense (e.g. a Bicycle ) or in a temporal sense (e.g. the cycle of the seasons). '''Cyclic''' or '''cyclical''' are the adjective forms. Pages about cycles include:

CONSULTING

Cycles , free time

Cycles , Srinivas time

SPORTS

Hitting For The Cycle in Baseball

Paris-Roubaix Cycle Race .

ARTS

, Cyclic Form and Song Cycle in music. Also in music, the Cycle Of Fifths .

Literature Cycle , e.g. The Ring Cycle (more examples there).

Sonnet Cycle (examples there).

The Cremaster Cycle , a sequence of five films by Matthew Barney.

The Baroque Cycle , a series of books written by Neal Stephenson.

The Pendragon Cycle , a series of books written by Stephen R. Lawhead.

Northern Homily Cycle , a poem from the 14th century

HISTORY

Indiction Cycle was a cycle of 15 years used to date medieval documents

Operation Cycle during World War II.

Dynastic Cycle in Chinese political theory.

Sexagesimal Cycle in Chinese philosophy and calendar

Cyclical Pattern s in history.

CULTURE

'' Cycles '', a 1968 album by Frank Sinatra .

A Cycle Path and (in Britain), the Sea To Sea Cycle Route and the National Cycle Network

Monomythic Cycle of the hero.

SCIENCE

Astronomy

Eclipse Cycle and the Saros Cycle .

Solar Cycle related to sunspots.

Solar Cycle (calendar) related to days of the week in calendars.

Full Moon Cycle .

Metonic Cycle in calendars.

Sothic Cycle in the ancient Egyptian calendar.

Great Year related to the precession of the equinoxes.

Biology

Life Cycle ;

Reproductive Cycle ;

Cell Cycle ;

Sleep Cycle ;

Lytic Cycle related to viruses;

Honeybee Life Cycle ;

Eel Life Cycle ;

Earthworm Organic Cycle ;

Urea Cycle ; and

Menstrual Cycle .

Human Sexual Response Cycle

Nutrient Cycle

Nitrogen Cycle

Phosphorus Cycle

Carbon Cycle

Chemistry

A series of chemical reactions. See e.g. Citric Acid Cycle , the Born Haber Cycle or the Calvin Cycle .

Biogeochemical Cycle s such as the Ozone-oxygen Cycle (see list there).

A Cyclic Compound . See also Alicyclic Compound

Physics

The cycle is a unit of Phase Angle equivalent to one oscillation, or 2π Radians . It appears in the once-common Frequency unit Cycle Per Second , which has now almost completely been supplanted by the Hertz .

Consequently, in Quantum Optics , a Rabi Cycle is that oscillation whose rate is the Rabi Frequency .

In astrophysics, the CNO Cycle is a sequence of nuclear reactions whose net effect is fusion. It is the predominant fuel reaction in stars larger than the sun.

Geology

Water Cycle

Rock Cycle

Meteorology

Milankovitch Cycles in paleo-climatology

Rapid Update Cycle for weather forecast

Engineering

Otto Cycle , the Diesel Cycle , the Two-stroke Cycle , the Miller Cycle and the Atkinson Cycle in cars;

Carnot Cycle , Rankine Cycle , Stirling Cycle and Ericsson Cycle in heat engines;

Brayton Cycle in a gas turbine;

Combined Cycle in power plants;

Refrigeration Cycle

---Rocket Liquid Air Cycle Engine

--- Expander Cycle

--- Gas-generator Cycle

---Rocket Staged Combustion Cycle

---Rocket Pressure-fed Cycle

The Nuclear Fuel Cycle

Bicycle , Tricycle and Unicycle . See also Freight Bicycle .

Motorcycle .

Mathematics

Cyclic Permutation .

Cyclic Group .

Cycle (graph Theory) and a Hamiltonian Cycle in graph theory. See also Cycle Space and Floyd's Cycle-finding Algorithm .

A cycle is an element of a Homology Class . See also Hodge Cycle .

The Limit-cycle in dynamical systems, e.g. the Lotka-Volterra Cycle .

A Cycle Matroid .

A Cyclic Order

Computer science

Instruction Cycle in a CPU

Military science

Boyd Cycle in military strategy.

Political science

Top Cycle , a notion in voting systems.

BUSINESS

Finance

A Cash Conversion Cycle .

The related notions of Product Life Cycle Management , Life Cycle Cost Analysis , Life Cycle Assessment and Systems Development Life Cycle .

Virtuous Circle And Vicious Circle .

A Business Cycle , e.g. the RBC .

A Cycle Count is an inventory management procedure

The Wright Cycle Company which funded the brothers' Wright aviation experiments.

Telecommunication

Duty Cycle in telecommunication.

CRIME

Cycle Of Violence , the cycle that can happen in Domestic Abuse .

SEE ALSO

Periodicity