# Representing Concept Definitions

This section summarizes the ways in which SNOMED CT concept definitions are represented. It outlines the rationale for changes to the way in which the stated view of concept definitions is represented. The changes are occurring during a transitional period that started in July 2018 and is due to be completed in 2019.

* [Concept Definitions Represented as Relationships](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/logical-model/2.3-concept-definitions/2.3.4-representing-concept-definitions/2.3.4.1-concept-definitions-represented-as-relationships)
* [Concept Definitions Represented in OWL](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/logical-model/2.3-concept-definitions/2.3.4-representing-concept-definitions/2.3.4.2-concept-definitions-represented-in-owl)

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