module

noun
  1. A self-contained unit or item that can be combined or interchanged with others to form a larger system. noun
    The spacecraft was composed of several modules that were assembled in orbit.
    Each module of the course can be completed independently.
  2. A unit of education or training that covers a single subject or topic. noun
    The university offers a module on environmental science as part of its biology degree.
    Students must complete all modules to graduate from the program.
  3. In computing, a module is a software component or part of a program that contains one or more routines. noun
    The new software update includes a security module to protect user data.
    Developers can add new features by integrating additional modules into the application.
  4. In mathematics, a module is a generalization of vector spaces where the field of scalars is replaced by a ring. noun
    The concept of a module is fundamental in abstract algebra.
    Modules over a ring have applications in various areas of mathematics.