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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 'everything under one roof' philosophy and ISO class 5-compliance from acceptance of granulates through production and final cleaning to packaging, ensures even higher quality, cleanness and customer satisfaction.
Both the haste with which he acts and the sheer scale of destruction leave little room for doubt that the God of Cleanness hates impurity to a degree reaching beyond man's comprehension.
Cleanness scholars have long noted its focus on divine judgment and on the disastrous consequences of breaching God's covenants.
Elahi said a two-month cleanness awareness campaign had been launched and after the said period fine would be imposed for throwing garbage at the public places.
During the course, 20 participants were acquainted with the means of health awareness, environment pollution protection and the importance of the personal cleanness in addition to preserving camp's cleanness.
267 for 2009 regulating the cleanness process and force the concerned bodies to apply it at the central and local level as well as the private sector.
His photographs have a kind of heroic clarity, epitomized by cleanness and studied composure.
A world sparkling with cleanness, Air so pure and dreams secure, When cities would be united, And man of creeds in one brotherhood, And childhood so precious, young and tender, Just that one step away, Is that holocaust nearer, And that dreaded day so far away?
What was so apparent was the cleanness of the streets, no litter or graffiti to be seen.
Indeed, technical cleanness requirements for workpieces has increased sharply in the last few years, and there is no end in sight.
The greatest pleasure of Pop art is its cleanness and clarity.
The degree of purity and cleanness needed was a great challenge.