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  1. cy·cle
    IPA[ˈsīk(ə)l]
  2. noun

    • 1. a series of events that are regularly repeated in the same order:

      the boom and slump periods of a trade cycle
    • 2. the period of time taken to complete a single sequence of events:

      the cells are shed over a cycle of twenty-eight days
    • 3. a recurring series of successive operations or states, as in the working of an internal combustion engine, or in the alternation of an electric current or a wave:

      the familiar four cycles of intake, combustion, ignition, and exhaust
    • 4. a recurring series of events or metabolic processes in the lifetime of a plant or animal:

      the storks' breeding cycle
    • 5. a series of successive metabolic reactions in which one of the products is regenerated and reused.

    • 6. the movement of a simple substance through the soil, rocks, water, atmosphere, and living organisms of the earth.

    • 7. a single set of hardware operations, especially that by which memory is accessed and an item is transferred to or from it, to the point at which the memory may be accessed again.

    • 8. a cycle per second; one hertz:

      AC reverses its direction of flow sixty times a second at 60 cycles
    • 9. a complete set or series:

      the painting is one of a cycle of seven
    • 10. a series of songs, stories, plays, or poems composed around a particular theme, and usually intended to be performed or read in sequence:

      Wagner's Ring Cycle
    • 11. a bicycle or tricycle:

      for the energetic, cycles may be hired cycle shorts
      Synonym : bicycle, two-wheeler, pedal cycle, bike, pushbike
    • 12. a ride on a bicycle:

      a 112-mile cycle

    verb

    • 1. ride a bicycle:

      she cycled to work every day
    • 2. move in or follow a regularly repeated sequence of events:

      economies cycle regularly between boom and slump
  3. Variation

    • n.: noun: cycle, plural noun: cycles

    • v.: verb: cycle, 3rd person present: cycles, gerund or present participle: cycling, past tense: cycled, past participle: cycled

    • noun

      a series of events that are regularly repeated in the same order:

      the period of time taken to complete a cycle of events:

    • verb

      ride a bicycle:

      move in or follow a regularly repeated sequence of events:

    • noun

      the sport or activity of riding a bicycle. Bicycle racing has three main forms: road racing (typically over long distances), track racing (on an oval track), and cyclocross (over rough, open country).
    • noun

      the sport or activity of riding a bicycle. Cycle racing has three main forms: road racing (typically over long distances), pursuit (on an oval track), and cyclo-cross (over rough, open country).
    • noun

      the cycle of operation of a machine or other device which operates intermittently rather than continuously.

      the time occupied by the cycle of operation of a machine or other device, especially as a percentage of available time.

    • noun

      the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.

      the cycle of thermonuclear reactions believed to occur in stars, in which carbon nuclei are repeatedly formed and broken down in the conversion of hydrogen into helium.

    • adjective

      denoting a type of electric battery that can be totally discharged and recharged several times.
    • adjective

      another term for two-stroke
    • noun

      a period of 19 years (235 lunar months), after which the new and full moons return to the same days of the year. It was the basis of the ancient Greek calendar and is still used for calculating movable feasts such as Easter.
    • noun

      the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
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