clear

(redirected from clear up)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Idioms, Wikipedia.

clear

1. emptied of freight or cargo
2. (of timber) having a smooth, unblemished surface
3. Showjumping (of a round) ridden without any fences being knocked down or any points being lost

clear

[klir]
(computer science)
To restore a storage device, memory device, or binary stage to a prescribed state, usually that denoting zero. Also known as reset.
A function key on calculators, to delete an entire problem or just the last keyboard entry.
(meteorology)
After United States weather observing practice, the state of the sky when it is cloudless or when the sky cover is less than 0.1 (to the nearest tenth).
To change from a stormy or cloudy weather condition to one of no precipitation and decreased cloudiness.
(navigation)
In marine navigation, to leave or pass safely, as to clear port or clear a shoal.
(ordnance)
To give a person a security clearance.
To operate a gun so as to unload it or make certain no ammunition remains; to free a gun of stoppages.

clear

The net distance, free from interruption, between any two surfaces or areas.

clear

i. In air traffic control, it means permitted to take off or land, cleared to carry out other maneuvers, or cleared to proceed under specified conditions. The activity the pilot is cleared to perform is either suffixed to the word clear, as in “clear to take off,” or it is in response to the request by the pilot as when “Permission to take off?” is answered by an air traffic controller's “Clear.”
ii. To rectify stoppage in an automatic weapon. Also to ensure its serviceability as in “clearing guns” (by firing a small burst into the air).
iii. Authorized to carry out any task as in “Clear to alter height” or “Clear to fly radial.”
iv. The area around the aircraft is clear for aircraft starting.
v. In reference to the sky, it is devoid of any clouds as in “clear sky.” The aircraft may also be in between layers but in VMC (visual meteorological conditions). Also means, “A portion of the sky is free or relatively free of clouds.”
vi. To check nearby airspace for safe airwork or maneuvering of aircraft.
vii. To clear an engine. To open the throttle of an idling reciprocating engine in flight to free it from carbon and/or an overrich mixture.
viii. To clear the air, meaning to gain a favorable air situation in a given sector.
ix. To authorize hardware as fit for use.
x. To fly over an obstacle without touching it (i.e., clear of obstacles).

CLEAR

(language)
A specification language based on initial algebras.

["An Informal Introduction to Specification Using CLEAR", R.M. Burstall in The Correctness Problem in Computer Science, R.S. Boyer et al eds, Academic Press 1981, pp. 185-213].
References in periodicals archive ?
As Mr Williams' farm is surrounded by country lanes, over the years he's been forced to clear up tonnes of rubbish: concrete blocks, bikes, clothes, black bin liners, bottles, newspapers and carpets.
TOP TIP: Barbara says: "For a kitchen clear up remove dust with a cloth first, and if cabinets are a hard surface veneer or painted woodwork, spray cleaner onto cloth rather than on to the surface.
The to schedule performance includes the planning of the extension of the existing medium and Niderspannungsanlagen and the renewal of the UPS systems connected to the creation of a clear UPS power structure.