> 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/r/relationship.md).

# relationship

## relationship

**This is an abbreviation for SNOMED CT relationship.**

## SNOMED CT relationship

An association between a source concept and a destination concept.

#### Notes

* Each *relationship* is represented by a separate row in the relationship file.
* Each *relationship* has a unique identifier and contains columns identifying the relationship type and the concepts that are related (sourceId "Reference term: sourceId (field)") and destinationId "Reference term: destinationId (field)")).
* Each *relationship* provides defining information about the source concept.

#### Change Notice

* Since July 2019, OWL axioms the authoritative representation of the stated view of concept definitions are represented by axioms distributed in OWL Expression Reference Sets. Relationships continue to be distributed to represent necessary normal form of the inferred view concept definitions.

#### Example

* The source, type and destination of one of the *relationships* for the concept [74400008 | Appendicitis (disorder)|](http://snomed.info/id/74400008) are as follows:

| **sourceId** | **typeId**   | **destinationId**                             |
| ------------ | ------------ | --------------------------------------------- |
| \[ 74400008  | appendicitis | ]\(<http://snomed.info/id/74400008> "74400008 |

## Alternatives

* **Relationship**

##

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