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circulation (n.)

mid-15c., circulacioun, in alchemy, "process of changing something from one element into another," from Latin circulationem (nominative circulatio), noun of action from past-participle stem of circulare "to form a circle," from circulus "small ring" (see circle (n.)).

Of blood, "act of moving so that it returns and begins again," first by William Harvey, 1620s. Meaning "act or state of being distributed" is from 1680s; that of "extent to which a thing circulates" (of periodical publications) is from 1847.

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Definitions of circulation from WordNet

circulation (n.)
the dissemination of copies of periodicals (as newspapers or magazines);
circulation (n.)
movement through a circuit; especially the movement of blood through the heart and blood vessels;
circulation (n.)
(library science) the count of books that are loaned by a library over a specified period;
circulation (n.)
number of copies of a newspaper or magazine that are sold;
by increasing its circulation the newspaper hoped to increase its advertising
circulation (n.)
free movement or passage (as of cytoplasm within a cell or sap through a plant);
a fan aids air circulation
ocean circulation is an important part of global climate
circulation (n.)
the spread or transmission of something (as news or money) to a wider group or area;
From wordnet.princeton.edu