What is the meaning of circulation?

noun

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