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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 ?
I am very proud that my town Panchgani has been selected as one of the cleanest towns in India, winning three district honours: Open defecation free city, Swachh [clean] city and Best Municipal Council in the state.
Nottingham was the UK's cleanest city with just 4% of residents expressing issues with overflowing bins, while London was the UK's worst city for problem waste, with a third of people having experienced problems with overflowing bins.
A report by Newsweek that ranks the world's 500 largest publicly listed companies has recognised Japan-based Toyota Motor Corporation (NYSE: TM), as the cleanest car maker.
But on the flip side, Tullamore in Co Offaly is the cleanest, taking the top spot on the list, followed by roads around Dublin Airport and Leixlip, Co Kildare.
GD Nassco says that the Perla Del Caribe and the Isla Bella are the world's cleanest cargo ships.
FPL has not been shy about its mission to become one of the state's cleanest energy companies and among the cleanest in the U.
Denmark topped the list as the world's cleanest country, followed by Finland while Sweden came third, Transparency International said.
We continue working to further improve the quality of our water, and last year our coast was the cleanest it has ever been.
The awards will be given in the categories of Garbage Guru, Toilet Titan, Tech Icon, Cleanest Beach Town, Cleanest Monument, Cleanest Park, Cleanest Hill Station, Community Mobiliser, Cleanest Ghat, Water Warrior, Corporate Trailblazer and Cleanest Market Place.
Laoag City took pride as it received once again the award for the Cleanest, Greenest, and Safest Local Government Unit (LGU) in Region 1 for 2015.
The cleanest air in Bulgaria is at Rozhen peak in the Rhodope mountains, while the cities Plovdiv and Varna have the most polluted air.
com)-- Belle Chevre's Chevre de Provence marinated cheese, one of the creamery's classic chevres, has been awarded the honor of one of Prevention magazine's annual 2014 Cleanest Packaged Food Awards.