The Collaborative International Dictionary of English v.0.48:
Circulate \Cir"cu*late\, v. i. [imp. & p. p. Circulated; p.
pr. & vb. n. Circulating.] [L. circulatus, p. p. of
circulare, v. t., to surround, make round, circulari, v. i.,
to gather into a circle. See Circle.]
1. To move in a circle or circuitously; to move round and
return to the same point; as, the blood circulates in the
2. To pass from place to place, from person to person, or
from hand to hand; to be diffused; as, money circulates; a
Circulating decimal. See Decimal.
Circulating library, a library whose books are loaned to
the public, usually at certain fixed rates.
Circulating medium. See Medium.