Circulation
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Circulation may be used in reference to:
- Circulatory system, a biological organ system whose primary function is to move substances to and from cells
- Circulation (fluid dynamics), the path integral of the fluid velocity around a closed curve
- Exhaust gas recirculation, a nitrogen oxide reduction technique
- Atmospheric circulation, the large-scale movement of air
- Newspaper circulation, the average number of copies of a newspaper distributed on a day
- Magazine circulation, the average number of copies of a periodical distributed per edition/ volume
- Circulation (journal), a scientific journal published by the American Heart Association
- Circulation (UK duo), a UK house music duo
- Circulation problem, a generalisation of network flow problems
- Library circulation, the activities around the lending of library books and other material to users of a lending library
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