Fully Defined Concept
Definition: A concept that is entailed by the set of its relationships to other concepts.
Reference Definition: A concept is sufficiently defined if its logic definition is sufficient to computably recognize (automatically subsume) all its subtypes. The logic definition must also differentiate the concept from its immediate supertype(s). A concept which is not sufficiently defined is primitive. For example, if the concept "Red car" is defined as (is-a: car) and (color: red) it is sufficiently defined but the same definition applied to the Concept “Red sports car” is primitive. (SNOMED CT User Guide)