module

A standardized, often interchangeable component of a system or construction that is designed for easy assembly or flexible use.

A length used as a unit of measurement or as a standard for determining the proportions of a building.

A self-contained assembly of electronic components and circuitry, such as a stage in a computer, that is installed as a unit.

A portion of a program that carries out a specific function and may be used alone or combined with other modules of the same program.

A self-contained unit of a spacecraft that performs a specific task or class of tasks in support of the major function of the craft.