The movement of blood through the body via the cardiovascular system, or more generally, the movement of any substance through a closed system or among people.
From Latin circulatio, from circulare 'to form a circle', from circulus 'small ring'. William Harvey's 1628 discovery of blood circulation revolutionized medicine by proving blood moves in a closed loop rather than being consumed.
Your blood completes a full circuit of your body in about 60 seconds, traveling roughly 60,000 miles of blood vessels - enough to circle Earth twice. The concept revolutionized not just medicine but economics, with ideas about money circulation mirroring blood flow.
Complete word intelligence in one call. Free tier — 50 lookups/day.