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a. (of a nuclear weapon) producing little or no radioactive fallout or contamination
b. uncontaminated
2. (of a wound, etc.) having no pus or other sign of infection
3. Aeronautics causing little turbulence; streamlined
4. (of an aircraft) having no projections, such as rockets, flaps, etc., into the airstream
5. Nautical of a vessel
a. having its bottom clean
b. having a satisfactory bill of health
6. Old Testament
a. (of persons) free from ceremonial defilement
b. (of animals, birds, and fish) lawful to eat
7. New Testament morally and spiritually pure
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


i. An aircraft that is not carrying external stores like drop tanks or armament.
ii. An aircraft in flight but with the undercarriage, flaps, and airbrakes retracted.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved


A lazy higher-order purely functional language from the University of Nijmegen. Clean was originally a subset of Lean, designed to be an experimental intermediate language and used to study the graph rewriting model. To help focus on the essential implementation issues it deliberately lacked all syntactic sugar, even infix expressions or complex lists,

As it was used more and more to construct all kinds of applications it was eventually turned into a general purpose functional programming language, first released in May 1995. The new language is strongly typed (Milner/Mycroft type system), provides modules and functional I/O (including a WIMP interface), and supports parallel processing and distributed processing on loosely coupled parallel architectures. Parallel execution was originally based on the PABC abstract machine.

It is one of the fastest implementations of functional languages available, partly aided by programmer annotations to influence evaluation order.

Although the two variants of Clean are rather different, the name Clean can be used to denote either of them. To distinguish, the old version can be referred to as Clean 0.8, and the new as Clean 1.0 or Concurrent Clean.

The current release of Clean (1.0) includes a compiler, producing code for the ABC abstract machine, a code generator, compiling the ABC code into either object-code or assembly language (depending on the platform), I/O libraries, a development environment (not all platforms), and documentation. It is supported (or will soon be supported) under Mac OS, Linux, OS/2, Windows 95, SunOS, and Solaris. E-mail: <>. Mailing list: <>.

["Clean - A Language for Functional Graph Rewriting", T. Brus et al, IR 95, U Nijmegen, Feb 1987].

["Concurrent Clean", M.C. van Eekelen et al, TR 89-18, U Nijmegen, Netherlands, 1989].



1. Used of hardware or software designs, implies "elegance in the small", that is, a design or implementation that may not hold any surprises but does things in a way that is reasonably intuitive and relatively easy to comprehend from the outside. The antonym is "grungy" or crufty.

2. To remove unneeded or undesired files in a effort to reduce clutter: "I'm cleaning up my account." "I cleaned up the garbage and now have 100 Meg free on that partition."
This article is provided by FOLDOC - Free Online Dictionary of Computing (
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| You can do spot cleaning Owning a cleaner means spot cleaning can be dealt with for smaller stains, rather than hiring a professional cleaner for a costly whole carpet clean.
Cleaner production is a strategy to prevent emissions from the production sources and to initiate a continuous preventive improvement of the environmental performance of the organizations (Glavic and Lukman, 2007).
This is a lot cheaper than the Dyson cordless vacuum cleaner and has a similar look and feel to the British product," said Hyun, an office worker living in Seoul.
LG's expertise within the vacuum cleaner market is a result of in-depth research and analysis, combining years of engineering efforts to bring acompact, reliable, easy-to-use, energy-efficient and powerful tool for everyday use.
After successfully dominating the Android industry's junk cleaner, phone booster, battery saver, duplicate photos cleaner, app manager and CPU cooler applications on Google Play Store, the company had recently expanded its presence in the Antivirus module by leading this platform as well.
Eventually, they came to terms enough for the young cleaner to do his assigned task, and the clean and glut-free domicile that has been revealed amazed both of them-and viewers, as well!
Following the announcement that a new CEMA standard for belt cleaners had been developed, Flexco updated its Belt Conveyor Product (BCP) Overview Guide with ratings on all of its heavy-duty belt cleaners.
In addition the pressure drops across the air cleaner at five airflow rates are measured.
**Includes all-purpose cleaner cloths, furniture polish/cleaner cloths, glass cleaner cloths, metal cleaner cloths and scouring cleaner cloths.
Offering a unique approach to carpet cleaning, this innovative product boasts two solutions in one - an upright carpet cleaner and portable spot cleaner for complete flexibility.
Offering a unique approach to carpet cleaning, this innovative product has two solutions in one - an upright carpet cleaner and a portable spot cleaner for complete flexibility.