What is the meaning of Clearance?

The act of clearing or something (such as a space) cleared.

The distance between two moving objects, especially between parts of a machine

The height or width of a tunnel, bridge or other passage, or the distance between a vehicle and the walls or roof of such passage; a gap, headroom.

A permission for a vehicle to proceed, or for a person to travel.

A permission to have access to sensitive or secret documents or other information.

A permission to use something, usually intellectual property, that is legally, but not otherwise, protected.

A sale of merchandise, especially at significantly reduced prices, usually in order to make room for new merchandise or updated versions of the same merchandise; sometimes as a closeout.

The settlement of transactions involving securities or means of payment such as checks by means of a clearing house.

The removal of harmful substances from the blood; renal clearance.

The act of potting all the remaining balls on a table at one visit.

The act of kicking a ball away from the goal one is defending.

Removal of pieces from a rank, file or diagonal so that a bishop, rook or queen is free to move along it.

Clear or net profit.

The first disposal in a chain that leaves the area of a stoppage, or a disposal that leaves the area of a stoppage itself.

The act of leaving the area of a stoppage.

clearance

clearance (removal of harmful substances from the blood)

Source: wiktionary.org