> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/c/component-version.md).

# component version

A representation of a SNOMED CT component at a particular point in time.

### Notes

* In SNOMED CT release files each *component version* is represented as a single row with a unique combination of *component.id* and *component.effectivetime.*
* The *component.id* uniquely identifies the component and is shared by other versions of that component.
* The *component.effectiveTime* distinguishes different versions of the same component. It indicates the point in time at which that version became the authoritative version of that component. The *effectiveTime* of the first version of a component represents the time when it first became available for use. The *effectiveTime* of each subsequent version of a component represents the time when that version superseded the previous version.

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