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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 periodicals archive ?
* Discuss food waste but cancel the "clean plate club."
Ro's Ten Secrets to Livin' Healthy, "and become a member of the lean plate club rather than the clean plate club." By taking that simple step, Dr.
I usually leave a clean plate but it beat me, though having been brought up on a diet of tripe didn't do me any favours.
The portions we ate were small, and the message at the table was to enjoy what's on your plate and, when you are full, stop (there's no Le Clean Plate Club in France).
Studies show that nearly every member of the Clean Plate Club in that era are prematurely dead."
The tenderloin was rinsed, placed on a clean plate, refrigerated, and grilled outdoors that evening.
The plate is heated, thereby melting the unexposed areas, then brought into contact with a non-woven fabric which absorbs the unexposed photopolymer, removing all of it and leaving a clean plate ready to mount on the press without the need for a lengthy drying step.
(The chicken will finish cooking later.) Transfer the chicken to a clean plate.
These systems can be placed on the front, rear or sides of the machine and will automatically demold parts and clean plate surfaces of any residual flash.
The second method was to draw with ink on a clean plate, exactly like drawing on paper.
With so much damage, it's like starting with a clean plate.
Remove the bacon from the casserole and transfer to a clean plate. Leave the bacon drippings in the casserole.