Real Dictionary

circulate
verb: If a piece of writing circulates or is circulated, copies of it are passed round among a group of people.
verb: If something such as a rumour circulates or is circulated, the people in a place tell it to each other.
verb: If you circulate at a party, you move among the guests and talk to different people.
verb: When something circulates, it moves easily and freely within a closed place or system.

circulate in American English
to cause to move around freely or go from one person or place to another; place in circulation
to move in a circle, circuit, or course and return to the same point, as blood through the body
intransitive verb: to move in a circle or circuit; move or pass through a circuit back to the starting point
transitive verb: to cause to pass from place to place, person to person, etc.; disseminate; distribute

circulate in British English
verb: to send, go, or pass from place to place or person to person