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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:
- Cycle studies for interdisciplinary cycle research. See also Foundation for the Study of Cycles and list of cycles
- In music: Interval cycle and song cycle in music. Also in music, the cycle of fifths.
- A literature cycle, e.g. The Ring Cycle (more examples there).
- A 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
- Break The Cycle, Staind's 3rd album.
- The indiction cycle was a cycle of 15 years used to date medieval documents
- Operation Cycle during World War II.
- The dynastic cycle in Chinese political theory.
- The Sexagesimal cycle in Chinese philosophy and calendar
- Cyclical patterns in history.
- The monomythic cycle of the hero.
- The life cycle;
- The reproductive cycle;
- The cell cycle;
- The sleep cycle;
- The lytic cycle related to viruses;
- The honeybee life cycle;
- The eel life cycle;
- The earthworm organic cycle;
- The urea cycle; and
- The Menstrual cycle.
- The human sexual response cycle
- The nutrient cycle
- The nitrogen cycle
- The phosphorus cycle
- The carbon cycle
- The Otto cycle, the Diesel cycle, the two-stroke cycle, the Miller cycle and the Atkinson cycle in cars;
- The Carnot cycle, Rankine cycle, Stirling cycle and Ericsson Cycle in heat engines;
- The Brayton cycle in a gas turbine;
- The combined cycle in power plants;
- The Refrigeration cycle
- The Nuclear fuel cycle
- A cycle in a permutation. See also Cyclic permutation and Cycle notation.
- A cyclic group.
- A cycle 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
- The Instruction cycle in a CPU
- The Boyd cycle in military strategy.
- Top cycle, a notion in voting systems.
- 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.
- The duty cycle in telecommunication.