1. Movement through a circuit; especially the movement of blood through the heart and blood vessels
   "Good circulation is essential for delivering oxygen and nutrients to all parts of the body"
    
2. Free movement or passage (as of cytoplasm within a cell or sap through a plant)
   "ocean circulation is an important part of global climate"; "a fan aids air circulation"
    
3. The spread or transmission of something (as news or money) to a wider group or area
   "The circulation of the newspaper increased after the breaking news"; "The central bank monitored the circulation of counterfeit currency"
    
4. The dissemination of copies of periodicals (as newspapers or magazines)
   "The magazine boasted a circulation of over 1 million copies"
    
5. Number of copies of a newspaper or magazine that are sold
   "by increasing its circulation the newspaper hoped to increase its advertising"
    
6. (library science) the count of books that are loaned by a library over a specified period
   "The librarian reported an increase in circulation during the summer months"

Derived forms: circulations

Type of: airing, change of location, count, dissemination, organic phenomenon, public exposure, spread, spreading, tally, travel

Encyclopedia: Circulation