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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 ?
And the world comes clean in moments like that for survivors.
King Coal Comes Clean - A discussion by some of the leading players in the utility technology and clean coal markets, addressing the development of the next generation of clean coal technology
When she comes clean she's sort of coming clean to us that she's none of these personas she's taking on," executive producer and showrunner Janine Sherman Barrois said in the featurette.
Ty comes clean to Fiz about having chalked up debts of up to PS10K, from having hosted the best Christmas ever for ill Hope.
30pm) IT'S the day of Jade's hearing and as Buster and Shirley nervously prepare for court, Mick comes clean with his priceless information.
Moira is not impressed when a guilty James confesses and wisely advises that he comes clean to Chas - before ace manipulator Emma does.
EMMERDALE ITV, 7pm and 8pm Cain comes clean to Charity, and when he later starts looking for a fight in The Woolpack, she threatens to tell everyone the truth if he doesn't calm down.
The actress comes clean about her belief in aliens, admitting: "I'm one of those that believes.
And Bianca comes clean about dangerous Derek's dodgy gear.
EASTENDERS Afia is still reeling from the revelation that her father once tried to kill her mother-in-law and tells Yusef he should leave London, but it's Zainab who has the most surprising reaction when the doctor comes clean about his part in the fire.
Fr Francis comes clean about his indiscretions - and then begs her to run away with him.