Module

From Middle French module, from Latin modulus ("a small measure, a measure, mode, meter"), diminutive of modus ("measure"); see mode.

Full definition of module

(plural modules)

A self-contained component of a system, often interchangeable, which has a well-defined interface to the other components.
(architecture) A standard unit of measure used for determining the proportions of a building.
(computing) A section of a program; a subroutine or group of subroutines.

2001, Phil Jones, Visual Basic: A Complete Course (page 254)Class modules are similar to form modules except they do not have a visible interface (GUI).

A unit of education covering a single topic.Which modules are you studying next year?
A pre-prepared adventure scenario with related materials for a role-playing game.

2011, Michael J. Tresca, The Evolution of Fantasy Role-Playing Games (page 81)Dragonborn ... first appeared in the Dragons of Despair module (1984) for Advanced Dungeons & Dragons as â€œdragonmen.â€

(mathematics) An abelian group.K-module, module over K
(mathematics) An algebraic structure which behaves just like a vector space over a field F, except that F is replaced by K, a commutative ring with unit.Any module extends easily into a $\mathbb{Z}$ -module.
(computing) A file containing a music sequence that can be played in a tracker (called also mod or music module).
(hydraulics) A contrivance for regulating the supply of water from an irrigation channel.
(astronautics) An independent self-contained unit of a spacecraft