vicious circle; vicious cycle
virtuous cycle; virtuous circle
circulatory system (blood, lymph, etc.)
loop-line bus; loop bus; bus on a circular route; bus following a circular route
loop line; circle line; circle route
cyclical; circulative; recursive
systemic circulation; general circulation (of the atmosphere)
water cycle; hydrologic cycle
circulatory system (blood, lymph, etc.)
funds flow; transfer of funds
left ventricular assist device; LVAD
round-trip transaction; round-tripping
end-around shift; cyclic shift
Hadley circulation; Hadley cell
Ferrel cell; Ferrel circulation
hydrologic cycle; water cycle