Definition of circulation

• n. - The act of moving in a circle, or in a course which brings the moving body to the place where its motion began.
• n. - The act of passing from place to place or person to person; free diffusion; transmission.
• n. - Currency; circulating coin; notes, bills, etc., current for coin.
• n. - The extent to which anything circulates or is circulated; the measure of diffusion; as, the circulation of a newspaper.
• n. - The movement of the blood in the blood-vascular system, by which it is brought into close relations with almost every living elementary constituent. Also, the movement of the sap in the vessels and tissues of plants.