Definition of: circulation

(sûr′kyə·lā′shən) noun
1. The act of circulating or state of being circulated.
2. Motion around or through something back to the starting point: the circulation of the blood.
3. Transmission; diffusion; dissemination.
4. The extent or amount of distribution; number of copies issued, as of a paper or periodical, etc.
5. A current medium of exchange, as coin, etc. [<L circulatio, -onis <circulari. See CIRCULATE.]
—cir′cu·la′tive adjective
—cir·cu·la·to·ry (sûr′kyə·lə·tôr′ē, -tō′rē) adjective