circulation

(noun) the dissemination of copies of periodicals (as newspapers or magazines).

(noun) movement through a circuit; especially the movement of blood through the heart and blood vessels.

(noun) (library science) the count of books that are loaned by a library over a specified period.

(noun) number of copies of a newspaper or magazine that are sold. Example: "By increasing its circulation the newspaper hoped to increase its advertising."

(noun) free movement or passage (as of cytoplasm within a cell or sap through a plant). Examples: "Ocean circulation is an important part of global climate." "A fan aids air circulation."

(noun) the spread or transmission of something (as news or money) to a wider group or area.