Clearance can refer to:

Medicine

Renal clearance ratio The renal clearance ratio or fractional excretion is a relative measure of the speed at which a constituent of urine passes through the kidneys. It is defined by following equation: : clearance\ ratio\ of\ X = \frac * X is the analyte substance * ...

, a relative measure of the speed at which a constituent of urine passes through the kidneys *

Clearance (pharmacology) In pharmacology, clearance (Cl_\text) is a pharmacokinetic parameter representing the efficiency of drug elimination. This is the rate of elimination of a substance divided by its concentration. The parameter also indicates the theoretical volume o ...

, the rate at which a substance is removed or cleared from the body by the kidneys or in renal dialysis

Engineering

Engineering tolerance Engineering tolerance is the permissible limit or limits of variation in: # a physical dimension; # a measured value or physical property of a material, manufactured object, system, or service; # other measured values (such as temperature, hum ...

, a physical distance or space between two components ** Hydraulic clearance, in hydraulic systems ** Clearance in civil engineering, including: *** The difference between the

loading gauge A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. Their purpose is to ensure that rail vehicles can pass safely through tunnels and under bridges, and k ...

and the

structure gauge A structure gauge, also called the minimum structure outline, is a diagram or physical structure that sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. It specifies the height and width of s ...

: the amount of space between the top of a rail car and the top of a tunnel or the bottom of a rail car and the top of rail ***

Air draft Air draft (or air draught) is the vertical distance from the surface of the water to the highest point on a vessel. This is similar to the '' deep draft'' of a vessel which is measured from the surface of the water to the deepest part of the h ...

, applies to bridges across navigable waterways *** Clearance car, a type of railroad car used to check clearances around the tracks *

Ride height Ride height or ground clearance is the amount of space between the base of an automobile tire and the lowest point of the automobile, typically the bottom exterior of the differential housing (even though the lower shock mounting point may be l ...

or ground clearance, the amount of space between the base of an automobile tire and the underside of the chassis

Finance and trade

Intellectual property

Collective rights management Collective rights management is the licensing of copyright and related rights by organisations acting on behalf of rights owners. Collective management organisations (CMOs), sometimes also referred to as collecting societies, typically represen ...

, the licensing of copyright and related rights * Sample clearance, legal permission to re-use a recording in another work

Other uses in finance and trade

Cheque clearing Cheque clearing (or check clearing in American English) or bank clearance is the process of moving cash (or its equivalent) from the bank on which a cheque is drawn to the bank in which it was deposited, usually accompanied by the movement of the ...

, the process of transferring value on a cheque from one bank account to another ** The activity of a

clearing house (finance) A clearing house, often written as ''clearinghouse'', is a financial institution formed to facilitate the exchange (i.e., '' clearance'') of payments, securities, or derivatives transactions. The clearing house stands between two clearing firms ( ...

, where a variety of financial instruments are cleared through the issuing institution * Customs clearance, in international trade, the movement of goods through customs barriers *

Market clearing In economics, market clearing is the process by which, in an economic market, the supply of whatever is traded is equated to the demand so that there is no excess supply or demand, ensuring that there is neither a surplus nor a shortage. The new ...

or equilibrium price, the price at which quantity supplied is equal to quantity demanded *

Closeout (sale) A closeout or clearance sale (also called a closing down sale in the United Kingdom) is a discounts and allowances, discount sale of inventory either by retail or wholesale. It may be that a product is not selling well, or that the retailer ...

, in retail, the final sale of items to zero inventory

Games and sports

Clearance (cue sports) The following is a glossary of traditional English-language terms used in the three overarching cue sports disciplines: ''carom billiards'' referring to the various games played on a billiard table without ; ''Pool (cue sports), pool'', which d ...

* A chess term for removal of pieces so that a bishop, rook or queen is free to move * In Australian rules football, the clearing of the ball out of a

ball-up A ball-up (pl. ball-ups) in Australian rules football is the method by which the field umpire restarts play at a neutral contest after a stoppage within the field of play. It involves the throwing or bouncing of the ball up between two players, ...

situation

Other uses

Authorization Authorization or authorisation (see American and British English spelling differences#-ise, -ize (-isation, -ization), spelling differences), in information security, computer security and identity management, IAM (Identity and Access Managemen ...

or permission from an authority **

Air traffic control Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled air ...

clearance in aviation **

Security clearance A security clearance is a status granted to individuals allowing them access to classified information (state or organizational secrets) or to restricted areas, after completion of a thorough background check. The term "security clearance" is ...

, a status granted to individuals allowing them access to classified information *

Clearance rate In criminal justice, clearance rate is calculated by dividing the number of crimes that are "cleared", a criminal charge being laid, or convicted by the total number of crimes recorded. Various groups use clearance rates as a measure of crimes s ...

, in criminal justice, the number of crimes "cleared" divided by the number reported *

Deforestation Deforestation or forest clearance is the removal and destruction of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. Ab ...

, the deliberate clearance of woodland or forest for human development * The

Highland Clearances The Highland Clearances ( , the "eviction of the Gaels") were the evictions of a significant number of tenants in the Scottish Highlands and Islands, mostly in two phases from 1750 to 1860. The first phase resulted from Scottish Agricultural R ...

, eviction of tenants in the Scottish Highlands during the 18th and 19th centuries * The

Lowland Clearances The Lowland Clearances were one of the results of the Scottish Agricultural Revolution, which changed the traditional system of agriculture which had existed in Lowland Scotland in the seventeenth century. Thousands of cottars and tenant far ...

, eviction of tenants as part of the Scottish Agricultural Revolution in the Scottish Lowlands