module

American  

[moj-ool] / ˈmɒdʒ ul /

noun

1. a separable component, frequently one that is interchangeable with others, for assembly into units of differing size, complexity, or function.

2. any of the individual, self-contained segments of a spacecraft, designed to perform a particular task.

   the spacecraft's command module; a lunar module.

3. a standard or unit for measuring.

4. a selected unit of measure, ranging in size from a few inches to several feet, used as a basis for the planning and standardization of building materials.

5. Mathematics. an Abelian group with a set of left or right operators forming a ring such that for any two operators and any group element the result of having the first operator act on the element, giving a second element, and the second operator act on the second element is equal to the result of having a single operator, formed by adding or multiplying the two operators, act on the first element.

6. Computers.

   1. part of a program that performs a distinct function.

   2. an interchangeable, plug-in hardware unit.

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module British  

/ ˈmɒdjuːl /

noun

1. a self-contained unit or item, such as an assembly of electronic components and associated wiring or a segment of computer software, which itself performs a defined task and can be linked with other such units to form a larger system

2. a standard unit of measure, esp one used to coordinate the dimensions of buildings and components; in classical architecture, half the diameter of a column at the base of the shaft

3. a standardized unit designed to be added to or used as part of an arrangement of similar units, as in furniture

4. astronautics any of several self-contained separable units making up a spacecraft or launch vehicle, each of which has one or more specified tasks

   command module

   service module

5. education a short course of study, esp of a vocational or technical subject, that together with other such completed courses can count towards a particular qualification

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Etymology

Origin of module

1555–65; < Latin modulus; see modulus

Explanation

A module is an individual part that combines with other components to make different things. You might have one module that's a cube, and another that's a slab of wood. Two cubes and a slab could make an end table. In space exploration, module can refer specifically to one of the lunar modules used for landing on the moon during the Apollo space missions. Two astronauts used a module to descend to the moon from the orbiting Apollo spacecraft and to return when the moon mission was complete. More recently, the Space Shuttle delivered several modules to the International Space Station, which is built on a modular design.

Example Sentences

Which explains the recycling of the Artemis I heat shield, despite the charring incurred, albeit with a modified re-entry approach intended to reduce the stress on the module.

From The Wall Street Journal • Apr. 14, 2026

The space agency is also drawing from external partners, such as the European companies that built the propulsion module for Orion.

From Barron's • Apr. 11, 2026

Behind the crew's seats, the service module lit its single main engine in a long, steady push that added thousands of kilometres per hour to Orion's speed.

From BBC • Apr. 2, 2026

The module is pluggable, meaning that it can be easily switched out without needing to interfere with other hardware.

From MarketWatch • Mar. 18, 2026

The final flight of the Apollo series took place in 1975, when a command module made a rendezvous with a Soviet Soyuz spacecraft.

From "Flying to the Moon: An Astronaut's Story" by Michael Collins

Related Words

• any
• chunk
• component
• detail
• element
• factor
• item
• lot
• measure
• member
• piece
• section
• sector
• segment
• share
• side
• unit