Cycle, cycles, or cyclic may refer to:

Anthropology and social sciences

* Cyclic history, a theory of history *

Cyclical theory The cyclical theory refers to a model used by historians Arthur M. Schlesinger Sr. and Arthur M. Schlesinger Jr. to explain the fluctuations in politics throughout American history. In this theory, the United States's national mood alternates betwe ...

, a theory of American political history associated with Arthur Schlesinger, Sr. *

Social cycle Social cycle theories are among the earliest social theories in sociology. Unlike the theory of social evolutionism, which views the evolution of society and human history as progressing in some new, unique direction(s), sociological cycle theory ...

, various cycles in social sciences ** Business cycle, the downward and upward movement of gross domestic product (GDP) around its ostensible, long-term growth trend

Arts, entertainment, and media

Films

* ''Cycle'' (2008 film), a Malayalam film * ''Cycle'' (2017 film), a Marathi film

Literature

* ''Cycle'' (magazine), an American motorcycling enthusiast magazine * Literary cycle, a group of stories focused on common figures

Music

Musical terminology

* Cycle (music), a set of musical pieces that belong together ** Cyclic form, a technique of construction involving multiple sections or movements ** Interval cycle, a collection of pitch classes generated from a sequence of the same interval class ** Song cycle, individually complete songs designed to be performed in a sequence as a unit

Albums

* ''Cycle'' (album), a 1965 album by the Paul Horn Quintet * ''Cycle'', a 2003 album by Merzbow * ''Cycle'', a 2014 album by Buckethead * ''Cycles'' (Cartel album), 2009 * ''Cycles'' (David Darling album), 1981 * ''Cycles'' (The Doobie Brothers album), 1989 * ''Cycles'' (Frank Sinatra album), 1968 * ''Cycles'' (Redbone album), 1977 * ''Cycles'', a 2021 album by

Sam Teskey Sam Teskey (born 1989) is an Australian blues musician, best known for his work with the Teskey Brothers. Sam won the ARIA Award for Engineer of the Year in 2019. His debut studio album, ''Cycles'', was released on 8 October 2021 via Ivy Leag ...

Songs

* "Cycles" (song), a 2018 song by Tove Lo * "Cycle" an interlude by Beck from '' Morning Phase'', 2014

Science, technology, and mathematics

Biology

* Cycle (gene), a gene in Drosophila melanogaster that encodes the CYCLE protein * Cyclic flower, in botany, one way in which flower parts may be arranged *

Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that make pregnancy possible. The ovarian cycle controls the production and release of eggs a ...

Computing

* Cycles, a render engine for the software Blender * Instruction cycle, the time period during which a computer processes a machine language instruction * Reference cycle, where a software object refers directly or indirectly to itself

Mathematics

* Cycle (algebraic topology), a simplicial chain with 0 boundary * Cycle per second, a unit of frequency, the modern equivalent being hertz *

Cycle (graph theory) In graph theory, a cycle in a graph is a non-empty trail in which only the first and last vertices are equal. A directed cycle in a directed graph is a non-empty directed trail in which only the first and last vertices are equal. A graph witho ...

, a nontrivial path in a graph from a node to itself ** Cycle graph, a graph that is itself a cycle **

Cycle matroid In the mathematical theory of matroids, a graphic matroid (also called a cycle matroid or polygon matroid) is a matroid whose independent sets are the forests in a given finite undirected graph. The dual matroids of graphic matroids are called co- ...

, a matroid derived from the cycle structure of a graph * Cycle (sequence), a sequence with repeating values ** Cycle detection, the algorithmic problem of detecting eventual repetitions in sequences generated by iterated functions * Cycle, a set equipped with a cyclic order ** Necklace (combinatorics), equivalence classes of cyclically ordered sequences of symbols modulo certain symmetries *

Cyclic (mathematics) There are many terms in mathematics that begin with cyclic: * Cyclic chain rule, for derivatives, used in thermodynamics * Cyclic code, linear codes closed under cyclic permutations * Cyclic convolution, a method of combining periodic functions * C ...

, a list of mathematics articles with "cyclic" in the title * Cyclic group, a group generated by a single element * Cyclic permutation, a basic permutation (all permutations are products of cycles)

Other uses in science and technology

* Charge cycle, charging and discharging a rechargeable battery * Thermodynamic cycle, a sequence of processes that involve transfer of heat and work into and out of a system * Cyclic, a primary flight control for helicopters * Cyclic compound

Vehicles

Bicycle A bicycle, also called a pedal cycle, bike or cycle, is a human-powered or motor-powered assisted, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A is called a cyclist, or bicyclist. Bic ...

* Motorcycle * Quadricycle * Tricycle *

Unicycle A unicycle is a vehicle that touches the ground with only one wheel. The most common variation has a bicycle frame, frame with a bicycle saddle, saddle, and has a human-powered vehicle, pedal-driven direct-drive mechanism, direct-drive. A two spee ...

Other uses

* Cycling, a sport *

Cycle (baseball) In baseball, hitting for the cycle is the accomplishment of one batter who hits a single, a double, a triple, and a home run in the same game. Collecting the hits in that order is known as a "natural cycle". Cycles are rare in Major League Bas ...

, a single, double, triple, and home run (in any order) by the same player in one game *

Cycle, North Carolina Cycle is an unincorporated community in Yadkin County, North Carolina, United States. History A post office A post office is a public facility and a retailer that provides mail services, such as accepting letters and parcels, providing po ...

, a community in the United States