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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 ?
The Clean House is written by Sarah Ruhl who was a finalist for the Pulitzer Prize for Drama for this poignant comedy, which has won huge critical acclaim in America.
The Clean House team will attempt to introduce a sense of style and organization by holding a yard sale, selling unwanted, existing furniture and using the money earned for new pieces to complete the makeover.
At first glance this may sound just a little obsessive-compulsive and a waste of a Saturday night out, but, in my defence, I like a clean house.
If Democrats fail in their promise to clean house, they can expect the same fate.
WASHINGTON, March 5 /PRNewswire/ -- A clean house makes people feel happy, satisfied, comfortable and healthy, according to new consumer research, which also reveals that 78 percent of Americans plan on spring cleaning this year, up 11 percent from 2002.
Clean house plant leaves to remove dust and unblock pores.
Baseball is finally beginning to clean house but if Bonds finally falls, the pain of his shaming will cast its shadow over the sport for decades.
March 19 /PRNewswire/ -- It's spring cleaning time and a new poll indicates Americans would like to clean house this season -- but not necessarily their houses.
His recent article about how keeping a clean house can add up to hot sex is sure to get folks talking.
Study spokesman Nick Smith said: "Three in five homeowners told us having a clean house is still important to them.