A concept definition is
a set of one or more axioms that partially or sufficiently specify the meaning of a SNOMED CT concept.
This appendix illustrates some of the features of concept definitions outlined in section 2.3 Concept Definitions.
The information in this section is particularly relevant to those wishing to understand the changes being made to enhance the representation of stated concept definitions between July 2018 and 2019. The transitional period for these changes begins with the July 31 release of the SNOMED CT International Edition and is scheduled to be completed during 2019.