circulation

Concise Oxford English Dictionary © 2008 Oxford University Press:
circulation/sɜːkjəˈleɪʃn/

▶noun

• 1 movement to and fro or around something.

  ■ the continuous motion by which blood travels through the body.

• 2 the public availability or knowledge of something: his music has achieved wide circulation.

• 3 the number of copies sold of a newspaper or magazine.

– phrases
in (or out of) circulation

• 1 available (or unavailable) for general use.

• 2 (of a person) seen (or not seen) in public.

– derivatives
circulatory adjective.