• A process that returns to its beginning and repeats itself in the same sequence. Such processes are seen in many fields, such as physics, mathematics, biology, astronomy, economics, audio frequency, etc.
• Bicycle
  Bicycle
  A bicycle, also known as a bike, pushbike or cycle, is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A person who rides a bicycle is called a cyclist, or bicyclist....
  
   or Motorcycle
  Motorcycle
  A motorcycle is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.Motorcycles are one of the most...
  
  
• See also List of cycles

Economics

• Business cycle
  Business cycle
  The term business cycle refers to economy-wide fluctuations in production or economic activity over several months or years...
  
  , economy-wide fluctuations in production or economic activity over several months or years

Mathematics

• Algebraic cycle
  Algebraic cycle
  In mathematics, an algebraic cycle on an algebraic variety V is, roughly speaking, a homology class on V that is represented by a linear combination of subvarieties of V. Therefore the algebraic cycles on V are the part of the algebraic topology of V that is directly accessible in algebraic geometry...
  
   and Hodge cycle
  Hodge cycle
  In differential geometry, a Hodge cycle or Hodge class is a particular kind of homology class defined on a complex algebraic variety V, or more generally on a Kähler manifold. A homology class x in a homology group...
  
  , homology classes in algebraic geometry
• Cycle (algebraic topology), a simplicial chain with zero boundary
• Cycle (graph theory)
  Cycle (graph theory)
  In graph theory, the term cycle may refer to a closed path. If repeated vertices are allowed, it is more often called a closed walk. If the path is a simple path, with no repeated vertices or edges other than the starting and ending vertices, it may also be called a simple cycle, circuit, circle,...
  
  , a nontrivial path in a graph from a node to itself
• Cycle (mathematics)
  Cycle (mathematics)
  In mathematics, and in particular in group theory, a cycle is a permutation of the elements of some set X which maps the elements of some subset S to each other in a cyclic fashion, while fixing all other elements...
  
  , a basic permutation (all permutations are products of cycles)
  • Cyclic (mathematics)
    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...
    
     shows other terms in mathematics beginning with cyclic or cycle
• Turn (geometry)
  Turn (geometry)
  A turn is an angle equal to a 360° or 2 radians or \tau radians. A turn is also referred to as a revolution or complete rotation or full circle or cycle or rev or rot....
  
   or cycle, a unit of plane angle equal to 360 degrees

Music

• Cycle (music)
  Cycle (music)
  A music cycle is when a section of a song/music is repeated.In music a cycle is a section which is repeated or repeatable indefinitely, with the end of a preceding repetition leading to the beginning of a succeeding repetition. Cycles may be melodic, harmonic, rhythmic, or based on some other...
  
  , a section of a piece that is repeated or repeatable
• Cyclic form
  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 end Cyclic form is a technique of musical...
  
  , a technique of construction involving multiple sections or movements
• Cycles (Cartel album)
  Cycles (Cartel album)
  Cycles is the third full-length studio album by American rock band Cartel, released through Wind-up Records on October 20, 2009.-Background and production:...
  
  
• Cycles (David Darling album)
  Cycles (David Darling album)
  Cycles is the second album by cellist David Darling recorded in 1981 and released on the ECM label.-Reception:The Allmusic review by Scott Yanow awarded the album 4 stars stating "Darling and his sidemen give the music a wide variety of sounds...
  
  
• Cycles (Doobie Brothers album)
• Cycles (Frank Sinatra album)
• Interval cycle
  Interval cycle
  In music, an interval cycle is a collection of pitch classes created from a sequence of the same interval class. In other words a collection of pitches by starting with a certain note and going up by a certain interval until the original note is reached In music, an interval cycle is a collection...
  
  , a collection of pitch classes generated from a sequence the same interval class

Miscellaneous

• Battery cycle, charging and discharging a rechargeable battery
• Cyclic flower
  Cyclic flower
  A cyclic flower is a flower type formed out of a series of whorls; sets of identical organs attached around the axis at the same point. Most flowers consist of a single whorl of sepals termed a calyx; a single whorl of petals termed a corolla; one or more whorls of stamens ; and a single whorl of...
  
  , in botany, one way in which flower parts may be arranged
• Cycle (baseball), a single, double, triple, and home run (in any order) by the same player in one game
• Cycle (film)
  Cycle (film)
  Cycle is a 2008 Malayalam film directed by Johny Antony and written by James Albert, starring Vineeth Sreenivasan, Vinu Mohan, Sandhya, Bhama, and Jagathy Sreekumar...
  
  , a 2008 Malayalam film
• Cyclic control, a primary flight control for helicopters
• Instruction cycle
  Instruction cycle
  An instruction cycle is the basic operation cycle of a computer. It is the process by which a computer retrieves a program instruction from its memory, determines what actions the instruction requires, and carries out those actions...
  
  , the time period during which a computer processes a machine language instruction
• Social cycle - various cycles in social sciences