Source : Webster's Revised Unabridged Dictionary (1913)

Module \Mod"ule\, v. t. [See {module}, n., {Modulate}.]
   To model; also, to modulate. [Obs.] --Sandys. Drayton.

Module \Mod"ule\, n. [F., fr. L. modulus a small measure, dim.
   of modus. See {Mode}, and cf. {Model}, {Modulus}, {Mold} a
   matrix.]
   1. A model or measure.

   2. (Arch.) The size of some one part, as the diameter of
      semi-diameter of the base of a shaft, taken as a unit of
      measure by which the proportions of the other parts of the
      composition are regulated. Generally, for columns, the
      semi-diameter is taken, and divided into a certain number
      of parts, called minutes (see {Minute}), though often the
      diameter is taken, and any dimension is said to be so many
      modules and minutes in height, breadth, or projection.

Source : WordNet®

module
     n 1: one of the inherent cognitive or perceptual powers of the
          mind [syn: {faculty}, {mental faculty}]
     2: detachable compartment of a spacecraft
     3: computer circuit consisting of an assembly of electronic
        components (as of computer hardware)
     4: a self-contained component (unit or item) that is used in
        combination with other components

Source : Free On-Line Dictionary of Computing

module
     
        1.  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.
     
        [Difference from {package}?].
     
        2.  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.
     
        (1997-10-27)