1.  module(n = noun.cognition) faculty, mental faculty - one of the inherent cognitive or perceptual powers of the mind;
is a kind of ability, power
has particulars: attention, language, speech, memory, retention, retentiveness, retentivity, intellect, reason, understanding, sensation, sense, sensory faculty, sentience, sentiency, volition, will

2.  module(n = noun.artifact) - detachable compartment of a spacecraft;
is a kind of compartment
is a part of ballistic capsule, space vehicle, spacecraft
has particulars: command module

3.  module(n = noun.artifact) - computer circuit consisting of an assembly of electronic components (as of computer hardware);
is a kind of computer circuit
Derived form adjective modular₁

4.  module(n = noun.artifact) - a self-contained component (unit or item) that is used in combination with other components;
is a kind of component, constituent, element
is a part of system
has particulars: cartridge, power module
Derived form adjective modular₁

1.  A model or measure. [1913 Webster]

2.  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. [1913 Webster]

   To model; also, to modulate. Sandys. Drayton. [1913 Webster]

module, n.
1 a standardized part or independent unit used in construction, esp. of furniture, a building, or an electronic system.
2 an independent self-contained unit of a spacecraft (lunar module).
3 a unit or period of training or education.
4 a a standard or unit of measurement. b Archit. a unit of length for expressing proportions, e.g. the semidiameter of a column at the base.

Etymology:
F module or L modulus: see MODULUS

N  prototype, original, model, pattern, precedent, standard, ideal, reference, scantling, type, archetype, antitype, protoplast, module, exemplar, example, ensample, paradigm, lay-figure, text, copy, design, fugleman, keynote, die, mold, matrix, last, plasm, proplasm, protoplasm, mint, seal, punch, intaglio, negative, stamp, a precedent embalms a principle, exempla sunt odiosa.

command module, lunar excursion module, lunar module, power module