Similar words: circulate, speculation, calculation, matriculation, circumlocution, population, regulation, tribulation. Meaning: [‚sɜːkjʊ'leɪʃn] 
n. 1. the dissemination of copies of periodicals (as newspapers or magazines) 2. movement through a circuit; especially the movement of blood through the heart and blood vessels 3. (library science) the count of books that are loaned by a library over a specified period 4. number of copies of a newspaper or magazine that are sold 5. free movement or passage through a series of vessels (as of water through pipes or sap through a plant) 6. the spread or transmission of something (as news or money) to a wider group or area.
n. 1. the dissemination of copies of periodicals (as newspapers or magazines) 2. movement through a circuit; especially the movement of blood through the heart and blood vessels 3. (library science) the count of books that are loaned by a library over a specified period 4. number of copies of a newspaper or magazine that are sold 5. free movement or passage through a series of vessels (as of water through pipes or sap through a plant) 6. the spread or transmission of something (as news or money) to a wider group or area. 
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271. Paper gives a brief description of the design features and operation experience of the first 300MW natural circulation boiler manufactured in China.
272. Naupathia and vomiting could induce complication of digestive system, circulation system and respiration system.
273. The effect of catalyst circulation rate on operation was also discussed.
274. The trickling filter and activated sludge efficiencies cited required primary sedimentation and effluent circulation.
275. If the circulation vanishes at one instant of time, it must vanish for all times.
276. Sitting on the ground is close to the posture of a baby sitting in mother's womb; therefore our blood circulation should be easier.
277. We must constantly adjust the amount of money in circulation.
278. As the disease progresses, blood clots may develop and plug up the artery, blocking circulation completely.
More similar words: circulate, speculation, calculation, matriculation, circumlocution, population, regulation, tribulation, capitulation, accumulation, congratulations, circuit, circuitous, circumspect, circumstance, circumstantial, relation, culmination, isolation, inflation, violation, collation, revelation, immolation, desolation, exhalation, acculturation, translation, correlation, installation.