circulation

英[sɜːkjʊ'leɪʃ(ə)n] 美[,sɝkjə'leʃən]

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

2. movement through a circuit; especially the movement of blood through the heart and blood vessels

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

4. number of copies of a newspaper or magazine that are sold;

"by increasing its circulation the newspaper hoped to increase its advertising"

5. free movement or passage through a series of vessels (as of water through pipes or sap through a plant)

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