? 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 , the path integral around a closed curve of the fluid velocity · 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 · Atmospheric circulation, the large-scale movement of air · Circulation , a scientific journal published by the American Heart Association · Circulation , 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 See also · List of circulating currencies

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