noun

• 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.
• (programming) A section of a program; a subroutine or group of subroutines.
• A unit of education covering a single topic.
• A pre-prepared adventure scenario with related materials for a role-playing game.
• (algebra, ring theory) An abelian group equipped with the operation of multiplication by an element of a ring (or another of certain algebraic objects), representing a generalisation of the concept of vector space with scalar multiplication.
• (fractal geometry, mathematics) A fractal element.
• (music) 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.