CLEARANCE

clearance

(noun) permission to proceed; “the plane was given clearance to land”

clearance

(noun) the distance by which one thing clears another; the space between them

headroom, headway, clearance

(noun) vertical space available to allow easy passage under something

Source: WordNet® 3.1

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Etymology

Noun

clearance (countable and uncountable, plural clearances)

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.

(retail) A sale of merchandise, especially at significantly reduced prices in order to make room for new merchandise or updated versions of the same merchandise.

(banking, finance) The settlement of transactions involving securities or means of payment such as checks by means of a clearing house.

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

(sports, billiards, snooker, pool) The act of potting all the remaining balls on a table at one visit.

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

(chess) 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.

(Australian rules football) The first disposal in a chain that leaves the area of a stoppage, or a disposal that leaves the area of a stoppage itself.

(Australian rules football) The act of leaving the area of a stoppage.

Source: Wiktionary

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Clear"ance, n.

1. The act of clearing; as, to make a through clearance.

2. A certificate that a ship or vessel has been cleared at the customhouse; permission to sail. Every ship was subject to seizure for want of stamped clearances. Durke

3. Clear or net profit. Trollope.

4. (Mach.)

Definition: The distance by which one object clears another, as the distance between the piston and cylinder head at the end of a stroke in a steam engine, or the least distance between the point of a cogwell tooth and the bottom of a space between teeth of a wheel with which it engages. Clearance space (Steam engine), the space inclosed in one end of the cylinder, between the valve or valves and the piston, at the beginning of a stroke; waste room. It includes the space caused by the piston's clearance and the space in ports, passageways, etc. Its volume is often expressed as a certain proportion of the volume swept by the piston in a single stroke.

Source: Webster’s Unabridged Dictionary 1913 Edition

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