The theory has been in circulation essentially since the September 11 attacks.
But there are already tens of millions of such guns already in circulation.
On the circulation side, things look better, but not better enough.
The circulation boys fell on our paper with exultant gurgles, and the next night we lifted the press run by 10,000 copies.
As soon as a new judge is accredited, his or her name is added to the circulation rolls.
The circulation was kept up and on the third day the whole mass was frozen.
The manner in which the money was put into circulation was stated.
No harm can come so long as the extremities are kept warm, and the circulation well balanced.
In one important respect Harvey's account of the circulation was incomplete.
Expanding business draws cash from the banks for circulation, trenching on reserves.
mid-15c., from Middle French circulation or directly from Latin circulationem (nominative circulatio), noun of action from past participle stem of circulare "to form a circle," from circulus "small ring" (see circle (n.)). Used of blood first by William Harvey, 1620s.
circulation cir·cu·la·tion (sûr'kyə-lā'shən)
Movement in a circle or circuit, especially the movement of blood through bodily vessels as a result of the heart's pumping action.
The flow of fluid, especially blood, through the tissues of an organism to allow for the transport and exchange of blood gases, nutrients, and waste products. In vertebrates, the circulation of blood to the tissues and back to the heart is caused by the pumping action of the heart. Oxygen-rich blood is carried away from the heart by the arteries, and oxygen-poor blood is returned to the heart by the veins. The circulation of lymph occurs in a separate system of vessels (the lymphatic system). Lymph is pumped back to the heart by the contraction of skeletal muscles.