Clearance 2689568 213413540 2008-05-19T06:09:07Z Boomtish 519791 A '''clearance''' can refer to: * in [[engineering]] and [[safety]], a physical [[distance]] or space '''[[Engineering tolerance|tolerance]]''', as in a [[truck]] ([[lorry]]), [[train]] or [[boat]] under a [[bridge]] as well as a train in a [[tunnel]] (see [[structure gauge]] and [[loading gauge]]). * The [[Insulator (electrical)#Clearance|distance]] between two electrical conductors in a gas medium. * a '''[[closeout]]''' or '''[[final|final sale]]''' * an '''[[authorization]]''' or '''[[permission]]''' from an [[authority]], for example: ** in [[aviation]], from [[air traffic control]] for an [[aircraft]] to proceed with a [[takeoff]] or [[landing]], or other action ** a '''[[security clearance]]''' * in [[medicine]], '''[[clearance (medicine)|clearance]]''' is the rate at which a substance is removed or cleared from the body by the kidneys and/or in [[renal dialysis]]. * in [[finance]], the verification of information between the two brokers in a securities transaction * in [[Australian rules football]], the clearing of the ball out of a [[ball-up|stoppage]] situation, to the advantage of one team or the other {{disambig}} [[de:Freigabe]] [[nl:Klaring (luchtvaart)]]