To move or cause to move continuously or freely through a closed system or area. The air conditioning system circulates cool air throughout the building.
To pass from place to place or person to person; to spread or disseminate. Rumors about the new policy began to circulate among the employees.
To move around a social gathering, engaging with different people. She circulated at the party, making sure to greet all her guests.
To be in active use as money or currency; to be current or in circulation. Old ten-cent coins no longer circulate after the introduction of the new currency.