• Webster's Revised Unabridged Dictionary
    • n Four-cycle (Thermodynamics) A four-stroke cycle, as the Otto cycle, for an internal-combustion engine.
    • ***
Century Dictionary and Cyclopedia
    • n four-cycle Same as four-phase cycle (which see, under internal-combustion motor).
    • ***


In literature:

The most plausible explanation is, that in the year 1479, they had traditions of twenty-four cycles.
"The Prehistoric World" by E. A. Allen
The Anthrax cycle is thus divided into four periods, each of which corresponds with special forms and functions.
"The Life of the Fly" by J. Henri Fabre
It's a four-cycle engine, and a fast boat, too.
"Dick in the Everglades" by A. W. Dimock
The Powers have given me four months, and I am going to London to hear the Wagner Cycle.
"The Pointing Man" by Marjorie Douie
It was all four French soldiers could do to get my motor-cycle out.
"Adventures of a Despatch Rider" by W. H. L. Watson
Stories of Richard Wagner's four operas which form the 'Nibelungen Cycle.
"Lists of Stories and Programs for Story Hours" by Various
A mineral or vegetable or animal species may pass through, during the cycle of its existence, these four processes.
"Socialism and Modern Science (Darwin, Spencer, Marx)" by Enrico Ferri
In short, you would soon be living a cycle of two days every twenty-four hours.
"The Girl in the Golden Atom" by Raymond King Cummings
It wobbled around, going up to two-point-seven cycles and dropping back to one-point-four, then climbing again.
"Unwise Child" by Gordon Randall Garrett
A one-cylinder engine of the ordinary four-cycle type has one power stroke for every two revolutions of the fly wheel.
"Electricity for the farm" by Frederick Irving Anderson

In news:

Lacking the large lineups and rapid three- or four-year product cycles of mainstream automakers, Rolls-Royce doesn't have an all-new vehicle to introduce at every auto show.
Siemens Energy has been awarded a contract to supply four simple cycle gas turbine packages for the Cleveland County generating plant near Grover in North Carolina.
Considering we are on the verge of entering into that every four year cycle of political craziness called "election season" you can bet that someone.
Chris Hoy Caught in Thailand Protests The AFP reports that four-time Olympic cycling champion Chris Hoy was among thousands of people stranded at Bangkok airport because of protests.
The autoRIC Device will deliver four cycles (5-min inflation and 5-min deflation) of intermittent arm ischemia (RIC) during transport to a hospital.
Pertussis cases peak in three- to four-year cycles.
LiuGong's new fuel-efficient 842IV Z-bar wheel loader features a Tier 4 Interim, six-cylinder, four-cycle, turbocharged, water-cooled Cummins QSB6.7-C200 diesel engine that provides 193 net peak horsepower.
The Obama campaign on Friday placed its final ad buy of the 2012 election cycle, purchasing TV airtime in two Florida markets and four Virginia markets, a campaign official told ABC News.
London opened four " cycle superhighways" in 2010, which basically amount to a blue lane for cyclists on the edge of city streets.
Top four artists from current cycle will be paired to perform duets on same show.
Surprisingly, the technology first appeared on Hodaka mini-cycles four decades ago.
The American Association of State Highway and Transportation Officials, along with Adventure Cycling Association and others, have laid the foundation for a nationwide bicycle network, via a plan that was four years in the making.
The EH36 OHV (overhead valve) slant cylinder four-cycle engine offers a maximum power output of 11.5 hp, and meets EPA Phase 2 and CARB Tier II requirements.
Holden, who appears at Bike N' Hike this weekend, went on to win the silver medal in the cycling time trial in Sydney four years later.
It was long thought that the protective effect of spaying was lost after four heat cycles or by 21/2 years of age, but a recent study suggests that some slight protection is afforded at any age, even when spayed at 9 years (4).

In science:

The robustness of the test is determined by how precisely we can predict the number of cycles contributed by the first four terms of this series.
A Robust Test of General Relativity in Space
Due to a prefactor of order minus five, as you move ealier in the inspiral (and away from the ISCO), the number of cycles contributed by terms of order four and less increase, whereas the number of cycles contributed by terms of order six or higher decrease.
A Robust Test of General Relativity in Space
Thus it seems likely that for these four nebulae about half the oxygen has been destroyed via ON cycling in the course of the evolution of the central stars of these four nebulae.
Planetary nebulae abundances and stellar evolution
The situation for ζ 6= 0 is more involved since, in order to get a minimum, we need also to consider the loop correction (3.36) coming from the large four-cycle.
De Sitter String Vacua from Dilaton-dependent Non-perturbative Effects
Einstein frame volume of the four cycle dual to the Kahler form measured in string units and θ the integral of the RR four form over the cycle.
Models of Particle Physics from Type IIB String Theory and F-theory: A Review