[cir.cu.la.tion] n (1654) 1: orderly movement through a circuit; esp: the movement of blood through the vessels of the body induced by the pumping action of the heart
2: flow 3 a: passage or transmission from person to person or place to place; esp: the interchange of currency "coins in ~" b: the extent of dissemination: as (1): the average number of copies of a publication sold over a given period (2): the total number of items borrowed from a library