circulation - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “circulation”

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circulation

noun [C/U]  us   /ˌsɜr·kjəˈlei·ʃən/
biology the movement of blood inside the body Circulation is also the movement of air or water in a space or system: [U] The fans in the air circulation system make a lot of noise. A magazine or newspaper’s circulation is the number of people who read it: [C] The Chronicle has a daily circulation of 505,000. If something is in circulation, it is available: [U] Are the new dollar coins in circulation yet? If something is out of circulation, it is not available: [U] The company takes its movies out of circulation, then shows them again. [U] fig.infml She’s been out of circulation since her accident.
(Definition of circulation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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