# subunit

/ˌsəbˈjunɪt/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/subunit
Updated: 2026-05-09

## Definition

a smaller part of a larger group or object. It works as its own piece but is still part of the whole system.

For teachers: a distinct component or structural part of a larger complex or entity. Often refers to a specific protein molecule that joins with others to form a functional protein complex.

## Examples

- The company divided the project among each subunit.
- The virus is composed of several protein subunits that must assemble correctly to become infectious.
- By analyzing each individual subunit of the organization, the consultants identified specific inefficiencies that were not visible when looking at the corporation as a single entity.

## Usage notes

- Commonly used in biological, chemical, and organizational contexts to describe modular parts.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.