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module.

1 Term derived from the Latin modulus, a unit of measure in classical architecture equal to half the diameter of a column at its base. This unit was used in proportioning the classical orders of architecture.

2 The modern module is an interchangeable building unit used in construction; these units are mass-produced and therefore easily replaced and economical.

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In architecture, a unit adopted to regulate the dimensions, proportions, or construction of the parts of a building. Modules based on the diameter of a column were used in Classical architecture. In Japanese architecture, room sizes were determined by combinations of standard rice mats called tatami. Both Frank Lloyd Wright and Le Corbusier used modular proportioning systems. Standardized modular design reduces waste, lowers costs, and offers ease of erection, flexible arrangement, and variety of use; however, most architects and producers of building materials continue to use modules based on their own special needs and interests.

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A self-contained hardware or software component that interacts with a larger system. A software module (program module) comes in the form of a file and typically handles a specific task within a larger software system. Hardware modules are units that often plug into a main system. See memory module, ROM card, MCM and modular programming.

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1.	(programming)	module - An independent piece of software which forms part of one or more larger programs. Different languages have different concepts of a module but there are several common ideas. Modules are usually compiled seperately (in compiled languages) and provide an abstraction or information hiding mechanism so that a module's implementation can be changed without requiring any change to other modules. In this respect they are similar to objects in an object-oriented language, though a module may contain many procedures and/or functions which would correspond to many objects. A module often has its own name space for identifiers so the same identifier may be used to mean different things in different modules.
2.	(hardware)	module - An independent assembly of electronic components with some distinct function, e.g. a RAM module consisting of several RAM chips mounted on a small circuit board.