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 betw ...

, 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 theor ...

, 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 examin ...

, 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 literary cycle is a group of stories focused on common figures, often (though not necessarily) based on mythical figures or loosely on historical ones. Cycles which deal with an entire country are sometimes referred to as matters. A fictional c ...

, a group of stories focused on common figures

Music

Musical terminology

Cycle (music) Cycle has several meanings in the field of music. Acoustically, it refers to one complete vibration, the base unit of Hertz being one cycle per second. Theoretically, an interval cycle is a collection of pitch classes created by a sequence of id ...

, a set of musical pieces that belong together **

Cyclic form Cyclic form is a technique of musical construction, involving multiple sections or movements, in which a theme, melody, or thematic material occurs in more than one movement as a unifying device. Sometimes a theme may occur at the beginning and ...

, a technique of construction involving multiple sections or movements **

Interval cycle In music, an interval cycle is a collection of pitch classes created from a sequence of the same interval class.Whittall, Arnold. 2008. ''The Cambridge Introduction to Serialism'', p. 273-74. New York: Cambridge University Press. (pbk). In other ...

, 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 (music), cycle, of individually complete Art song, songs designed to be performed in a sequence as a unit.Susan Youens, ''Grove online'' The songs are either for solo voice ...

, 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), "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