noun

1. free movement around from place to place, as of air in ventilating
2. the act of moving around in a complete circuit; specif., the movement of blood out of and back to the heart through the arteries and veins
3. the flow of sap in a plant
4. the passing of something, as money or news, from person to person or place to place; dissemination
5. 1. the distribution of newspapers, magazines, etc. among readers
   2. the extent to which something is circulated, as the average number of copies of a magazine sold in a given period

Etymology: ME circulacioun < L circulatio: see circulate