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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 (
References in periodicals archive ?
Small sections or lengths of the sewer segment (steps or passes) are cleaned in each pull of the cleaning nozzle.
Operators who will perform sampling of cleaned equipment should be trained and "qualified." Qualification means comparing a trial "swab recovery" experiment recovery and evaluate them against the standard.
Numerous components built into motor vehicles are cleaned in wet chemical processes with solvents, or with water-based cleaning agents in batch processes.
smaller than the nozzle bore, but if not cleaned periodically they will stick hard.
Small, intricate and complex molds and openings, like the micro-vents on tire molds or catheter tip molds, continued to be cleaned or finished by hand.
Although most castings, large or small, will be cleaned and finished, both low- to medium-production facilities ([+ or -] 200 molds/day) and high-production facilities ([+ or -] 200 molds/hr.) endure individual burdens in their cleaning operations.
Researchers at the University of Wisconsin reported that used plastic cutting boards could be cleaned and disinfected only in a dishwasher, while hot soapy water in the sink was enough for used wooden cutting boards.
If the fabrics are off the machine, blow boxes and any vacuum rolls should be checked for signs of filling and cleaned if needed," said Kimpfbeck.
Let's start with the facts: (1) The appearance or performance of carpet in common areas is often disappointing, particularly in lobbies, hallways and lower-floor entrances to elevators; (2) build-up of odors (from incontinent residents) and spots/stains from medication and food spills are a constant concern and challenge; (3) turnaround time on dining areas, individual rooms and other guest/resident spaces is critical; (4) preventing mildew, mold and/or bacterial growth in rooms is crucial; and (5) often, the carpet is cleaned intermittently, after soil has built up and can be seen.