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HIERARCHY (2) (Preferred term)
Relationship based on degrees or levels of superordination and subordination, where the superordinate term represents a class or whole, and subordinate terms refer to its members or parts. (ISO 2788, Clause 8.3)
A relationship between terms that is based on a ranking or order from a superior to a subordinate position. For example, the activity Child Maintenance Management is a subset of the broader term Legal Case Management.