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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 ?
Last year, Plastics SA co-ordinated over 400 clean ups nationwide during Clean-up and Recycle Week with over 16000 volunteers.
Ryan Slack,'s chief executive officer, said, "Purchasers of contaminated property can be held liable for costly clean ups so they should always conduct due diligence for environmental hazards.
And every week they say they love doing the clean ups."
"We also hope that the minority who contributed to the litter and fly-tipping problem will respect the time and effort that has been made to clean up the area and will refrain from littering again."
They also organise and carry out a weekly clean up along the Coventry Canal and 'one-off' clean ups in other areas.
Individuals, community groups and businesses will all be lending a hand to the big clean up, while street performers and artists will add a carnival atmosphere along the way.
The site is an 81-acre brownfield that RPS has agreed to lease from the owners of the Raritan Center property and to clean up in return for a property tax abatement from Woodbridge Township, NJ.
More than 2,000 locals, including councillors, MPs and MSPs, have got stuck in, helping to clean up their local area, and the schoolkids I have seen have enjoy getting involved, helping to give them a sense of pride in their community.
SCORES of volunteers turned out to help clean up a Tyneside park.
Young offenders have helped clean up a popular Barry beach.
The Big Clean Up campaign kicks off on Monday for two weeks and will feature pantomime dame Ann T Litter.
TAKEAWAYS could be forced to clean up after their customers who dump rubbish on the streets of Coventry.