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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 ?
(14) Such a broad context provides a space for theological reflection whose analysis need not exclude either Aquinas or Augustine, and it is with this in mind that I offer the following interpretation of Cleanness and Patience, which, despite its markedly Augustinian, or even proto-Lutheran character still positions the poet within the broad orthodoxy of medieval Catholicism.
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.
To maximize impact, the campaign will be preceded by awareness activities about public cleanness in all public and private schools of Sana'a, as well as meeting with imams to specify their role in the campaign.
The Middle English Cleanness is a poem remarkable for its presentation of God, a ruthless master who easily succumbs to ire and does not hesitate to wreck the earth in a fit of anger, only to suffer from pangs of conscience afterwards.
The meeting focused on the necessity for monitoring the safety of food to conform to international standards on the health, cleanness and environmental levels.
Cleanness scholars have long noted its focus on divine judgment and on the disastrous consequences of breaching God's covenants.
The school is very well known throughout the community as a leader in education, cleanness, presentation, and the production of accomplished students.
The company says that the clean room complies with cleanness class ISO 5, and is "upheld by the laminar flow principle: there is always a slight overpressure in the room maintained by an ultra-clean turbulence-free flow of air.
This agreement aims to boost co-operation between the two cities in various fields like cleanness, environment protection, culture, parks and tourism.
He asked media outlets to broadcast programmes on the importance of a clean environment and encourage residents to take part in the cleanness of Kabul River.
Studiosus selects hotels based on client evaluations, which rate facilities for atmosphere, comfort, cleanness, breakfast and service.
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.