Cycle, cycles, or cyclic may refer to:

Anthropology and social sciences

* Cyclic history, a theory of history * Cyclical theory, a theory of American political history associated with Arthur Schlesinger, Sr. * Social cycle, various cycles in social sciences **

Business cycle Business cycles are intervals of expansion followed by recession in economic activity. These changes have implications for the welfare of the broad population as well as for private institutions. Typically business cycles are measured by exami ...

, 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 A song cycle (german: Liederkreis or Liederzyklus) is a group, or cycle, of individually complete songs designed to be performed in a sequence as a unit.Susan Youens, ''Grove online'' The songs are either for solo voice or an ensemble, or rarel ...

, 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 is a Japanese noise project started in 1979 by , best known for a style of harsh, confrontational noise. Since 1980, Akita has released over 400 recordings and has collaborated with various artists. The name Merzbow comes from the German dada ...

* ''Cycle'', a 2014 album by

Buckethead Brian Patrick Carroll (born May 13, 1969), known professionally as Buckethead, is an American guitarist, songwriter, and multi-instrumentalist. He has received critical acclaim for his innovative electric guitar playing. His music spans severa ...

* ''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

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) ''Cycle'' (''cyc'') is a gene in ''Drosophila melanogaster'' that encodes the CYCLE protein (CYC). The ''Cycle'' gene ''(''c''yc)'' is expressed in a variety of cell types in a circadian manner. It is involved in controlling both the sleep- ...

, 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 eg ...

Computing

* Cycles, a render engine for the software

Blender A blender (sometimes called a mixer or liquidiser in British English) is a kitchen and laboratory appliance used to mix, crush, purée or emulsify food and other substances. A stationary blender consists of a blender container with a rotating me ...

Instruction cycle The instruction cycle (also known as the fetch–decode–execute cycle, or simply the fetch-execute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions ...

, 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 The cycle per second is a once-common English name for the unit of frequency now known as the hertz (Hz). The plural form was typically used, often written cycles per second, cycles/second, c.p.s., c/s, or, ambiguously, just cycles (Cy./Cyc.). T ...

, a unit of frequency, the modern equivalent being

hertz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one her ...

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 wit ...

, 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 calle ...

, 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), a list of mathematics articles with "cyclic" in the title *

Cyclic group In group theory, a branch of abstract algebra in pure mathematics, a cyclic group or monogenous group is a group, denoted C''n'', that is generated by a single element. That is, it is a set of invertible elements with a single associative bi ...

, 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 thermodynamic cycle consists of a linked sequence of thermodynamic processes that involve transfer of heat and work into and out of the system, while varying pressure, temperature, and other state variables within the system, and that eventu ...

, 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 A cyclic compound (or ring compound) is a term for a compound in the field of chemistry in which one or more series of atoms in the compound is connected to form a ring. Rings may vary in size from three to many atoms, and include examples where ...

Vehicles

* Bicycle *

Motorcycle A motorcycle (motorbike, bike, or trike (if three-wheeled)) is a two or three-wheeled motor vehicle steered by a handlebar. Motorcycle design varies greatly to suit a range of different purposes: long-distance travel, commuting, cruisin ...

* Quadricycle *

Tricycle A tricycle, sometimes abbreviated to trike, is a human-powered (or gasoline or electric motor powered or assisted, or gravity powered) three-wheeled vehicle. Some tricycles, such as cycle rickshaws (for passenger transport) and freight trikes ...

Unicycle A unicycle is a vehicle that touches the ground with only one wheel. The most common variation has a frame with a saddle, and has a pedal-driven direct-drive. A two speed hub is commercially available for faster unicycling. Unicycling is practi ...

Other uses

Cycling Cycling, also, when on a two-wheeled bicycle, called bicycling or biking, is the use of cycles for transport, recreation, exercise or sport. People engaged in cycling are referred to as "cyclists", "bicyclists", or "bikers". Apart from tw ...

, 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, a community in the United States