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 * ''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

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

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 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 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), 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 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 * Motorcycle * Quadricycle * Tricycle * Unicycle

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