(redirected from comes clean)
Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Idioms.


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 ?
Bleeth comes clean on how she got clean, her struggle to stay sober and how she found love in the most unlikely place.
Fr Francis comes clean about his indiscretions - and then begs her to run away with him.
ELIJAH finally comes clean to Leah that he was with Vinnie when he died (though actually he's starring in True Blood).
Jordan comes clean about his medical condition then Jessica admits Harry could be his son.
IT'S THE WATER: Jonathan Antin, the star hairstylist of the reality show ``Blow Out,'' comes clean.
PROSPECT, the largest union at Daresbury-based British Nuclear Fuels, has demanded the government comes clean about its intentions for the future ownership of the group.
Thank you for your honesty," snarls Larry (Ciaran Hinds) after his new bride, Anna (Natasha Richardson), comes clean about her yearlong affair with Dan (Rupert Graves), who's been married to Alice (Anna Friel) for three years.
Eventually he comes clean, and Sinead is disappointed in him.
James comes clean to girlfriend Chas (both above) about being the father of Moira'son Adam.
Vanessa comes clean to Max about Jodie's parentage after Harry starts plastering the Square with revealing posters of her, and Ian surprises Jane with a thoughtful gesture.
When he comes clean, Leon thinks he's just trying to protect Jason who is still in the closet - so outs him by entering him in the local heat of Mr Gay UK.
Jasmine comes clean to a shocked Laurel about her part in Shane's death; Marlon makes the tough decision to end his marriage to cheating Donna