Topic
hierarchy.
system of elements with multiple levels or tiers that are subordinated to each other
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About hierarchy
A hierarchy is an arrangement of items that are represented as being "above", "below", or "at the same level as" one another. Hierarchy is an important concept in a wide variety of fields, such as architecture, philosophy, design, church, mathematics, computer science, organizational theory, systems theory, systematic biology, and the social sciences.
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