1 [intransitive and transitive] to move around within a system, or to make something do this:
Swimming helps to get the blood circulating through the muscles.
Ceiling fans circulated warm air around the room.
2 [intransitive] if information, facts, ideas etc circulate, they become known by many people:
Rumours began circulating that the Prime Minister was seriously ill.
3 [transitive] to send goods, information etc to people:
The group circulated petitions calling for a federal law to ban handguns.
4 [intransitive] to talk to a lot of different people in a group, especially at a party