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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 ?
As a thoroughly "user-friendly" guide to getting the job done, Coming Clean features and easy-to-use format consisting of how to and what to do room-by-room and on a daily, weekly and seasonally basis, as well as tips for keeping chaos in check, folding sheets and towels to maximize space, getting kids to clean up, finding all of the necessary supplies, what to purchase when remodeling, and some "Lean 'n Clean" exercises.
However, he added he was proud of her coming clean about her drug use in Vanity Fair - even though Lindsay, 19, has since denied making the comments.
Coming clean -- the overarching theme for next year's annual reports, now in planning stages -- may be a significant departure for some CEOs, who've preferred to gloss over bad news.
If Ottawa is incapable of accepting that the churches have been coming clean in divulging assets and finances, it should nonetheless face up to the fact that even if the churches were concealing millions upon millions of dollars, they would still fall far short of having the resources to contribute to the extent that Ottawa has demanded.
There is no doubt Mr Jones is right that it is the responsibility of politicians, not businessmen, to direct the charge, and he is equally correct to say the indecision is damaging to Britain's business, but there is little likelihood of Tony Blair coming clean about his true feelings on the single currency.
Ladbrokes are not coming clean over the football singles bets question
To its credit, DEP is coming clean, confessing to the errors and vowing to make things right.
WASHINGTON -- On May 22, 2012, Safer Chemicals, Healthy Families a coalition led by the staff of Coming Clean, a nonprofit corporation, held an event in Washington D.