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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 ?
Flexo Wash, is displaying several new products including the new FW Handy XL, a narrow web anilox cleaner and the new PK EZ Clean Plate & Parts Washer, both designed for entry level, narrow web flexo printers.
Served with a creamy mustard mash, it was truly outstanding and the clean plate from someone who claimed he wasn't all that hungry tells its own story.
All of these clean plate clubbers, though, should pay heed to AICR experts, who suggest that continuous cleaning off of one's plate may be linked to obesity and obesity-related diseases.
If nothing else you get guaranteed membership into the clean plate club
You ate what was in front of you - a clean plate was a standard requirement.
Roast saddle (as per cooking times above) then remove from roasting tray and let rest on large clean plate or tray.
We had to digitize the whole scene into the computer, then go through and build what we call a clean plate.
Scot McKay, owner of the six unit, three concept restaurant group called The Clean Plate Club, is on a mission to rid the food industry of trans fats.
Given his commitment to a clean plate when the food is categorised as a) delicious; and b) free, the half-crumpet leftover and the satisfied smile was a clear demonstration that it had been filling.
Indeed, it's pretty much the same sort of inspiration I get from Masterchef and watching ordinary people produce - in the words of John Torode - a clean plate of food, that wouldn't look out of place in a restaurant.
After presenting the waitress with his third clean plate of the afternoon, my uncle Jim slumped back in his chair and gasped: "When we fly back to Sydney, I'll have to pay an excess baggage fee for my gut.