Cycle, cycles, or cyclic may refer to:

Anthropology and social sciences

Cyclic history 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 ...

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

Literature

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

Songs

* Cycles (song), "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

Computing

* Cycles, a render engine for the software Blender (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), a nontrivial path in a graph from a node to itself ** Cycle graph, a graph that is itself a cycle ** Cycle matroid, 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, 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 Helicopter flight controls#Cyclic, flight control for helicopters * Cyclic compound

Vehicles

* Bicycle * Motorcycle * Quadricycle * Tricycle * Unicycle

Other uses

* Cycling, a sport * Cycle (baseball), 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