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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


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.


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."
References in classic literature ?
A TURBULENT Person was brought before a Judge to be tried for an assault with intent to commit murder, and it was proved that he had been variously obstreperous without apparent provocation, had affected the peripheries of several luckless fellow-citizens with the trunk of a small tree, and subsequently cleaned out the town.
Like Trefethan, he was another mining engineer who had cleaned up a fortune in the Klondike.
I'll never forget when you cleaned out those lumberjacks in the M.
She had only left that country once, and then, with a bunch of the young bucks, she went over Chilcoot, cleaned up her gold-cache, and brought it back with her.
The boundary line between the part that had been cleaned and the part that had not was traceable wherever the inscription left a blank space of marble--sharply traceable as a line that had been produced by artificial means.
Floors cleaned with environmentally-friendly waxes have not produced the high shine traditional cleaning products have produced.
But beds have to be made, toilets have to be cleaned, laundry has to be done.
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.
Heidelmann says molds can be cleaned in place, without disassembly or removal, when either cool or hot.
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.
The beauty of it is that machinery, wiring, zinc molds, practically anything can be cleaned in half the time it takes other forms of cleaning, resulting in less downtime, says Sasseville.