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A set of members all of which are members of another set (from set theory in mathematics).
In SNOMED CT, the definition of subset applies to SNOMED CT components as follows:
A subset of SNOMED CT concepts is a set of concepts taken from a wider set of concepts.
A subset of SNOMED CT descriptions is a set of descriptions taken from a wider set of descriptions.
The members of a subset can be defined in one of two ways:
Extensionally, by enumeration, with a simple reference set as the standard distribution format.
Intensionally, using rules to determine inclusion, with a query reference set as the standard distribution format.
A subset of SNOMED CT concepts from all of the concepts in a particular version of a SNOMED CT edition.
A subset of SNOMED CT descriptions from all the descriptions in a particular version of a SNOMED CT edition.
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