cycle

cy·cle

C0834500 (sī′kəl)n.1. An interval of time during which a characteristic, often regularly repeated event or sequence of events occurs: Sunspots increase and decrease in intensity in an 11-year cycle.2. a. A single complete execution of a periodically repeated phenomenon: A year constitutes a cycle of the seasons.b. A periodically repeated sequence of events: the cycle of birth, growth, and death; a cycle of reprisal and retaliation.3. The orbit of a celestial body.4. A long period of time; an age.5. a. The aggregate of traditional poems or stories organized around a central theme or hero: the Arthurian cycle.b. A series of poems or songs on the same theme: Schubert's song cycles.6. A bicycle, motorcycle, or similar vehicle.7. Botany A circular or whorled arrangement of flower parts such as those of petals or sepals.8. Baseball The achievement of hitting a single, double, triple, and home run in a single game.v. cy·cled, cy·cling, cy·cles v.intr.1. To occur in or pass through a cycle.2. To move in or as if in a cycle.3. To ride a bicycle, motorcycle, or similar vehicle.v.tr. To use in or put through a cycle: cycled the heavily soiled laundry twice; cycling the recruits through eight weeks of basic training.

[Middle English cicle, from Late Latin cyclus, from Greek kuklos, circle; see k^wel- in Indo-European roots.]

cy′cler n.

cycle

(ˈsaɪkəl) n1. a recurring period of time in which certain events or phenomena occur and reach completion or repeat themselves in a regular sequence2. a completed series of events that follows or is followed by another series of similar events occurring in the same sequence3. the time taken or needed for one such series4. a vast period of time; age; aeon5. (Literary & Literary Critical Terms) a group of poems or prose narratives forming a continuous story about a central figure or event: the Arthurian cycle. 6. (Theatre) a series of miracle plays: the Chester cycle. 7. (Music, other) a group or sequence of songs. See song cycle8. short for bicycle, tricycle, motorcycle9. (Astronomy) astronomy the orbit of a celestial body10. (Biology) a recurrent series of events or processes in plants and animals: a life cycle; a growth cycle; a metabolic cycle. 11. (General Physics) physics a continuous change or a sequence of changes in the state of a system that leads to the restoration of the system to its original state after a finite period of time12. (Electronics) one of a series of repeated changes in the magnitude of a periodically varying quantity, such as current or voltage13. (Computer Science) computing a. a set of operations that can be both treated and repeated as a unitb. the time required to complete a set of operationsc. one oscillation of the regular voltage waveform used to synchronize processes in a digital computer14. (Grammar) (in generative grammar) the set of cyclic rulesvb15. (tr) to process through a cycle or system16. (intr) to move in or pass through cycles17. to travel by or ride a bicycle or tricycle[C14: from Late Latin cyclus, from Greek kuklos cycle, circle, ring, wheel; see wheel] ˈcycling n, adj

cy•cle

(ˈsaɪ kəl)

n., v. -cled, -cling. n. 1. any complete round or recurring series. 2. a round of years or a recurring period of time, esp. one in which certain events or phenomena repeat themselves in the same order and at the same intervals. 3. any long period of years. 4. a bicycle, motorcycle, or tricycle. 5. a group of poems, stories, songs, etc., about a central theme or figure: the Arthurian cycle. 6. Physics. a. a sequence of changing states that, upon completion, produces a final state identical to the original one. b. one of a succession of periodically recurring events. v.i. 7. to ride a bicycle, motorcycle, or the like. 8. to move or revolve in cycles; pass through cycles. [1350–1400; < Late Latin cyclus < Greek kýklos cycle, circle, ring; compare wheel]

Cycle

a set or series: a collection of miracle plays; a long indefinite period.Examples: cycle of champions, 1829; of changes; of epics; of miracle plays; of morality, 1837; of poems; of metrical romances, 1837; of seasons; of songs; of sonnets, 1870; of years.

cycle

Past participle: cycled
Gerund: cycling

Imperative
cycle
cycle

Present
I cycle
you cycle
he/she/it cycles
we cycle
you cycle
they cycle

Preterite
I cycled
you cycled
he/she/it cycled
we cycled
you cycled
they cycled

Present Continuous
I am cycling
you are cycling
he/she/it is cycling
we are cycling
you are cycling
they are cycling

Present Perfect
I have cycled
you have cycled
he/she/it has cycled
we have cycled
you have cycled
they have cycled

Past Continuous
I was cycling
you were cycling
he/she/it was cycling
we were cycling
you were cycling
they were cycling

Past Perfect
I had cycled
you had cycled
he/she/it had cycled
we had cycled
you had cycled
they had cycled

Future
I will cycle
you will cycle
he/she/it will cycle
we will cycle
you will cycle
they will cycle

Future Perfect
I will have cycled
you will have cycled
he/she/it will have cycled
we will have cycled
you will have cycled
they will have cycled

Future Continuous
I will be cycling
you will be cycling
he/she/it will be cycling
we will be cycling
you will be cycling
they will be cycling

Present Perfect Continuous
I have been cycling
you have been cycling
he/she/it has been cycling
we have been cycling
you have been cycling
they have been cycling

Future Perfect Continuous
I will have been cycling
you will have been cycling
he/she/it will have been cycling
we will have been cycling
you will have been cycling
they will have been cycling

Past Perfect Continuous
I had been cycling
you had been cycling
he/she/it had been cycling
we had been cycling
you had been cycling
they had been cycling

Conditional
I would cycle
you would cycle
he/she/it would cycle
we would cycle
you would cycle
they would cycle

Past Conditional
I would have cycled
you would have cycled
he/she/it would have cycled
we would have cycled
you would have cycled
they would have cycled

Thesaurus

Noun	1.	cycle - an interval during which a recurring sequence of events occurs; "the never-ending cycle of the seasons"round, rhythminterval, time interval - a definite length of time marked off by two instantsphase angle, phase - a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
	2.	cycle - a series of poems or songs on the same theme; "Schubert's song cycles"series - similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
	3.	cycle - a periodically repeated sequence of events; "a cycle of reprisal and retaliation"repeat, repetition - an event that repeats; "the events today were a repeat of yesterday's"merry-go-round - a never-ending cycle of activities and events (especially when they seem to have little purpose); "if we lose the election the whole legislative merry-go-round will have to start over"samsara - (Hinduism and Buddhism) the endless cycle of birth and suffering and death and rebirth
	4.	cycle - the unit of frequency; one hertz has a periodic interval of one secondcps, cycle per second, cycles/second, hertz, Hzkc, kHz, kilocycle, kilocycle per second, kilohertz - one thousand periods per secondrate - a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"
	5.	cycle - a single complete execution of a periodically repeated phenomenon; "a year constitutes a cycle of the seasons"oscillationperiodic event, recurrent event - an event that recurs at intervalscardiac cycle - the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles; "the cardiac cycle can be shown on an electrocardiogram"Carnot cycle, Carnot's ideal cycle - a cycle (of expansion and compression) of an idealized reversible heat engine that does work without loss of heatpass - one complete cycle of operations (as by a computer); "it was not possible to complete the computation in a single pass"menstrual cycle - a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; "the average menstrual cycle is 28 days"
	6.	cycle - a wheeled vehicle that has two wheels and is moved by foot pedalsbicycle, bike, wheelbicycle-built-for-two, tandem bicycle, tandem - a bicycle with two sets of pedals and two seatsbicycle seat, saddle - a seat for the rider of a bicyclebicycle wheel - the wheel of a bicyclechain - a series of (usually metal) rings or links fitted into one another to make a flexible ligamentcoaster brake - a brake on a bicycle that engages with reverse pressure on the pedalshandlebar - the shaped bar used to steer a bicyclekickstand - a swiveling metal rod attached to a bicycle or motorcycle or other two-wheeled vehicle; the rod lies horizontally when not in use but can be kicked into a vertical position as a support to hold the vehicle upright when it is not being riddenall-terrain bike, mountain bike, off-roader - a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous countrymudguard, splash guard, splash-guard - a curved piece above the wheel of a bicycle or motorcycle to protect the rider from water or mud thrown up by the wheelsordinary bicycle, ordinary - an early bicycle with a very large front wheel and small back wheelfoot lever, foot pedal, treadle, pedal - a lever that is operated with the footpush-bike - a bicycle that must be pedaledsafety bicycle, safety bike - bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gearsprocket wheel, sprocket - thin wheel with teeth that engage with a chainvelocipede - any of several early bicycles with pedals on the front wheelwheeled vehicle - a vehicle that moves on wheels and usually has a container for transporting things or people; "the oldest known wheeled vehicles were found in Sumer and Syria and date from around 3500 BC"
Verb	1.	cycle - cause to go through a recurring sequence; "cycle the laundry in this washing program"make pass, pass - cause to pass; "She passed around the plates"recycle - cause to repeat a cycle
	2.	cycle - pass through a cycle; "This machine automatically cycles"go across, pass, go through - go across or through; "We passed the point where the police car had parked"; "A terrible thought went through his mind"cycle on - come to the starting point of a cycle
	3.	cycle - ride a motorcyclemotorbike, motorcycleride - be carried or travel on or in a vehicle; "I ride to work in a bus"; "He rides the subway downtown every day"
	4.	cycle - ride a bicycle bicycle, bike, pedal, wheelunicycle - ride a unicyclebackpedal - pedal backwards on a bicycleride - be carried or travel on or in a vehicle; "I ride to work in a bus"; "He rides the subway downtown every day"
	5.	cycle - recur in repeating sequencesrecur, repeat - happen or occur again; "This is a recurring story"

cycle

noun series of events, round (of years), circle, revolution, rotation the necessary cycle of birth, growth, decay and death

cycle

nounA course, process, or journey that ends where it began or repeats itself:circle, circuit, orbit, round, tour, turn.

Translations

循环歌曲等自行车表现同一主题的一组诗歌、歌曲等骑自行车

cycle¹

(ˈsaikl) verb to go by bicycle. He cycles to work every day.骑自行车 noun shortened form of bicycle. They bought the child a cycle for his birthday.自行车ˈcyclist noun a person who rides a bicycle. 骑自行车的人

cycle²

(ˈsaikl) noun1. a number of events happening one after the other in a certain order. the life-cycle of the butterfly. 周期，循环 2. a series of poems, songs etc written about one main event etc. a song cycle. （表现同一主题的）一组诗歌，歌曲等 3. (of alternating current, radio waves etc) one complete series of changes in a regularly varying supply, signal etc. （交流电、无线电的）周期 ˈcyclic adjective周期的ˈcyclically adverb周期地

cycle

→ 循环zhCN, 自行车zhCN, 骑自行车zhCN

Is there a cycle map of this area? → 有没有当地的自行车路线图？
Where's the bicycle path to ...? (US)
Where is the cycle path to ...? (UK) → 去...的自行车道在哪儿？

cycle

cycle,

in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal timesidereal time
(ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star appears twice on the observer's celestial meridian.
..... Click the link for more information. ). A frequently observed cycle is the dayday,
period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary observer's celestial meridian.
..... Click the link for more information. , during which the sun seems to circle around the earth due to the earth's rotation on its axis; although the length of the day varies, the average day is defined as exactly 24 hr of mean solar timesolar time,
time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial.
..... Click the link for more information. . Another important cycle is the yearyear,
time required for the earth to complete one orbit about the sun. The solar or tropical year is measured relative to the sun and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time).
..... Click the link for more information. , during which the earth completes an orbit of the sun. The solar year is measured from one vernal equinoxequinox
, either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. The vernal equinox, also known as "the first point of Aries," is the point at which the sun appears to cross the celestial equator from south to north.
..... Click the link for more information. to the next and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see calendarcalendar
[Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily observable natural events, the cycle of the sun through the seasons with equinox
..... Click the link for more information. ). The sidereal year, measured relative to the stars, differs in length from the solar year due to the precession of the equinoxesprecession of the equinoxes,
westward motion of the equinoxes along the ecliptic. This motion was first noted by Hipparchus c.120 B.C. The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to
..... Click the link for more information. . The moon goes through a cycle of phases as it orbits the earth, completing a cycle from one full moon to the next in about 29 1-2 days, or one lunar month (see synodic periodsynodic period
, in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the same elongation.
..... Click the link for more information. ). The moon completes an orbit of the earth relative to the stars in one sidereal month, which is about 2 days shorter than the lunar month. Every 18 years, 11 1-3 days the earth, moon, and sun are in very nearly the same relative positions; for this reason, solar and lunar eclipseseclipse
[Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses, which occur when the earth blocks the sun's light from the moon, and solar eclipses, occurring when the moon blocks the sun's light
..... Click the link for more information. recur in a cycle with this period. This cycle was known to the Chaldaeans (fl. 1000–540 B.C.) and was called the saros by them. Halley's cometHalley's comet
or Comet Halley
, periodic comet named for Edmond Halley, who observed it in 1682 and identified it as the one observed in 1531 and 1607. Halley did not live to see its return in 1758, close to the time he predicted.
..... Click the link for more information. reappears in a cycle whose period is about 75 years. Astronomers also make use of various other cycles, e.g., those of sunspots and variable stars.

cycle

cyclical phenomena

any repetitive or recurring social processes in which a sequence of events is followed by a similar sequence on completion. Numerous social processes are accepted as manifesting a cyclical pattern (e.g. the life cycle); other suggested cyclical patterns (e.g. historical cycles, the CIRCULATION OF ÉLITES) are more controversial.

Bourdon and Bourricaud (1989) identify an important general category of cyclical phenomena, i.e. those that result when ‘a process, in developing, causes a negative feedback to arise, which ends in a reversal of the process’. In ECONOMICS, the well-known cobweb theorem has this basis: producers tend to estimate future prices on the basis of current process, thus, they tend to produce an excess of products they think will be most profitable, and insufficient quantities of goods which they estimate will be less profitable, producing, when graphically expressed, a cyclical spider's web-like pattern of movements from one equilibrium position to another. A more straightforward example is provided by patterns of take-up of vaccination: high levels of vaccination lead to fewer illnesses due to a particular disease, leading to fewer vaccinations and a return of the disease, leading in turn to a renewal of take-up of vaccination. One attraction of conceptualizations of social reality as involving cyclical processes is that these can often be formulated mathematically although such models rarely manifest themselves in a pure form in social life.

Cycle

in thermodynamics, a process in which a physical system (such as steam) returns to its initial state after undergoing a series of changes.

At the end of a cycle the thermodynamic parameters and characteristic functions of the system’s state (such as the temperature T, pressure p, volume V, internal energy U, and entropy S) once again assume their original values, and consequently the changes in them during the cycle are equal to zero (Δ £7 = 0, and so on). All changes arising as a result of a cycle occur only in the medium surrounding the system. In some sections a system or working body accomplishes positive work through its internal energy and the quantities of heat Q_n gained from external sources, whereas in other sections of the cycle extrinsic forces perform work on the system, part of which goes to restore the system’s internal energy.

According to the first law of thermodynamics (the law of conservation of energy), the work accomplished in a cycle by or on a system (A) is equal to the algebraic sum of the quantities of heat (Q) received or given up in each section of the cycle (ΔU = Q - A = 0, A = Q). The ratio A/Q_n (the ratio of the work accomplished by the system to the amount of heat received by it) is called the efficiency of the cycle.

A distinction is made between equilibrium cycles (or, more accurately, quasiequilibrium cycles), in which the states through which the system passes are close to equilibrium states, and nonequilibrium cycles, in which at least one of the sections is a nonequilibrium process. The efficiency is at a maximum in equilibrium cycles. A graphic representation of an equilibrium (reversible) Carnot cycle with maximum efficiency is shown in Figure 1.

A cycle is called direct if it results in the accomplishment of work on external bodies and in the transfer of a certain amount of heat from a hotter body (the heater) to a colder body (the cooler). A cycle that results in the transfer of a certain amount of heat from the cooler to the heater through extrinsic forces is called a reverse or cooling cycle.

Cycles have played a prominent role in physics, chemistry, and technology. The design of various equilibrium cycles was historically the first method of thermodynamic research. This method made possible, on the basis of analysis of the working cycle of an ideal heat engine (the Carnot cycle), the derivation of a mathematical expression for the second law of thermodynamics and the construction of the thermodynamic temperature scale. Many important thermodynamic relations (such as the Clausius-Clapeyron equation) were found by examining the corresponding

Figure 1. Diagram of a direct Carnot cycle in various coordinate systems: (a) volume V and pressure p, (b) volume V and temperature T, (c) entropy S and temperature T. The area ABCD is proportional to the work of the cycle. The reverse cycle takes place in the opposite order— ADCBA (counterclockwise on the graph).

cycles. Cycles are used in technology as the working cycles of internal-combustion engines and of various thermal-power and refrigeration units.

REFERENCES

Krichevskii, I. R. Poniatiia i osnovy termodinamiki. Moscow, 1962.
Kurs fizicheskoi khimii, 2nd ed., vol. 1. Edited by la. I. Gerasimov. Moscow, 1969.

cycle

[′sī·kəl] (engineering) To run a machine through a single complete operation. (fluid mechanics) A system of phases through which the working substance passes in an engine, compressor, pump, turbine, power plant, or refrigeration system. (mathematics) A member of the kernel of a boundary homomorphism. A closed path in a graph that does not pass through any vertex more than once and passes through at least three vertices. Also known as circuit. cyclic permutation (science and technology) One complete sequence of values of an alternating quantity. A set of operations that is repeated as a unit. (statistics) A periodic movement in a time series.

alternating current

An electric current that varies periodically in value and direction, first flowing in one direction in the circuit and then flowing in the opposite direction; each complete repetition is called a cycle, and the number of repetitions per second is called the frequency; usually expressed in Hertz (Hz).

cycle

i. One complete sequence of events making up a portion of life. For example, a cycle can be startup, taxi, takeoff, climb, cruise, descend, land, taxi, and switch off. It could be an application of full power on the engine, or in an internal combustion engine, four strokes of the Otto cycle.
ii. A complete process of starting at zero, passing through two maximums of opposite direction, and returning to zero again.

cycle

1. Lit a group of poems or prose narratives forming a continuous story about a central figure or event 2. a series of miracle plays 3. Music a group or sequence of songs (see song cycle) 4. Astronomy the orbit of a celestial body 5. Biology a recurrent series of events or processes in plants and animals 6. Physics a continuous change or a sequence of changes in the state of a system that leads to the restoration of the system to its original state after a finite period of time 7. Physics one of a series of repeated changes in the magnitude of a periodically varying quantity, such as current or voltage 8. Computinga. a set of operations that can be both treated and repeated as a unit b. the time required to complete a set of operations c. one oscillation of the regular voltage waveform used to synchronize processes in a digital computer
www.uci.ch
www.usacycling.org

cycle

(unit)A basic unit of computation, one period of a computerclock.

Each instruction takes a number of clock cycles. Often thecomputer can access its memory once on every clock cycle, andso one speaks also of "memory cycles".

Every hacker wants more cycles (noted hacker Bill Gosperdescribes himself as a "cycle junkie"). There are only somany cycles per second, and when you are sharing a computerthe cycles get divided up among the users. The more cyclesthe computer spends working on your program rather thansomeone else's, the faster your program will run. That's whyevery hacker wants more cycles: so he can spend less timewaiting for the computer to respond.

The use of the term "cycle" for a computer clock period canprobably be traced back to the rotation of a generatorgenerating alternating current though computers generally usea clock signal which is more like a square wave.Interestingly, the earliest mechanical calculators,e.g. Babbage's Difference Engine, really did have partswhich rotated in true cycles.

cycle

(1) A single event that is repeated. For example, in a carrier frequency, one cycle is one complete wave.

(2) A set of events that is repeated. For example, in a polling system, all of the attached terminals are tested in one cycle. See machine cycle and memory cycle.

cycle

cy·cle

cycle

cy•cle

Cycle

cycle

cycle

cycle

cycle1

cycle2

cycle

cycle

break the cycle

donorcycle

donorcycle

cycle

cycle,

cycle

cyclical phenomena

Cycle

REFERENCES

cycle

alternating current

cycle

cycle

cycle

cycle

cycle

cycle

cy·cle

cy·cle

cycle

anovular cycle

cardiac cycle

Treatment

cell cycle

cell growth cycle

citric acid cycle

Cori cycle

duty cycle

estrus cycle

gastric cycle

genesial cycle

glycolytic cycle

initiated cycle

Krebs cycle

life cycle

menstrual cycle

nitrogen cycle

sleep-wake cycle

stimulated cycle

stretch-shortening cycle

tricarboxylic acid cycle

unstimulated cycle

urea cycle

Wald cycle

cy·cle

Patient discussion about cycle

Cycle

Cycle

CYCLE

cycle

Synonyms for cycle

noun series of events

Synonyms

Synonyms for cycle

noun a course, process, or journey that ends where it began or repeats itself

Synonyms

Synonyms for cycle

noun an interval during which a recurring sequence of events occurs

Synonyms

Related Words

noun a series of poems or songs on the same theme

Related Words

noun a periodically repeated sequence of events

Related Words

noun the unit of frequency

Synonyms

Related Words

noun a single complete execution of a periodically repeated phenomenon

cycle¹

cycle²