Clearance
Encyclopedia
A clearance can refer to:
- in chessChessChess is a two-player board game played on a chessboard, a square-checkered board with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.Each player...
, A positional move, where a player moves a piece occupying a certain square away, replacing it with an allied piece that will strengthen the player's position. - in engineering and safety, a physical distanceDistanceDistance is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria . In mathematics, a distance function or metric is a generalization of the concept of physical distance...
or space tolerance, as in a truck (lorry), train or boat under a bridge as well as a train in a tunnel (see structure gaugeStructure gaugeThe structure gauge, also called the minimum clearance outline, is the minimum height and width of tunnels and bridges as well as the minimum height and width of the doors that allow a rail siding access into a warehouse...
and loading gaugeLoading gaugeA loading gauge defines the maximum height and width for railway vehicles and their loads to ensure safe passage through bridges, tunnels and other structures...
).- in mechanical engineering, the space between a bolt and a hole, etcetera.
- The distance between two electrical conductors in a gas medium.
- a closeout or final sale
- an authorizationAuthorizationAuthorization is the function of specifying access rights to resources, which is related to information security and computer security in general and to access control in particular. More formally, "to authorize" is to define access policy...
or permission from an authority, for example:- a security clearanceSecurity clearanceA security clearance is a status granted to individuals allowing them access to classified information, i.e., state secrets, or to restricted areas after completion of a thorough background check. The term "security clearance" is also sometimes used in private organizations that have a formal...
- an ATCATC- Military :* Air Training Command, the predecessor to Air Education and Training Command in the United States Air Force* New Zealand Air Training Corps* Air Training Corps, United Kingdom...
clearance in aviation.
- a security clearance
- in criminal justice, the clearance rateClearance rateIn criminal justice, clearance rate is calculated by dividing the number of crimes that are "cleared" by the total number of crimes recorded. Clearance rates are used by various groups as a measure of crimes solved by the police....
is the number of crimes "cleared" divided by the number reported - Clearance (medicine)Clearance (medicine)In medicine, the clearance is a measurement of the renal excretion ability. Although clearance may also involve other organs than the kidney, it is almost synonymous with renal clearance or renal plasma clearance. Each substance has a specific clearance that depends on its filtration characteristics...
, the rate at which a substance is removed or cleared from the body by the kidneys and/or in renal dialysis. - in Australian rules football, the clearing of the ball out of a stoppageBall-upA ball-up in Australian rules football describes a method of restarting play at a neutral contest after a stoppage within the field of play. It is not to be confused with a boundary throw-in which occurs in most cases when the ball is forced out of bounds...
situation, to the advantage of one team or the other - the Highland ClearancesHighland ClearancesThe Highland Clearances were forced displacements of the population of the Scottish Highlands during the 18th and 19th centuries. They led to mass emigration to the sea coast, the Scottish Lowlands, and the North American colonies...
, forced displacements of people in Scotland in the 18th and 19th centuries - Clearance (insult), Referring to someone or something as completely worthless or terrible at what he, she, or it does. In such a manner that they are no better than or that they are a clearance item Ex: You are such a clearance medic