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A hierarchy (from Greek: ἱεραρχία, hierarkhia, 'rule of a high priest', from hierarkhes, 'president of sacred rites') is an arrangement of items (objects, names, values, categories, etc.) 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 ...
A sonority hierarchy or sonority scale is a hierarchical ranking of speech sounds (or phones ). Sonority is loosely defined as the loudness of speech sounds relative to other sounds of the same pitch, length and stress, [1] therefore sonority is often related to rankings for phones to their amplitude. [2] For example, pronouncing the vowel [a ...
The Chomsky hierarchy (infrequently referred to as the Chomsky–Schützenberger hierarchy [1]) in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a language's vocabulary (or alphabet) that are valid according ...
Hierarchical organization. A hierarchical organization or hierarchical organisation (see spelling differences) is an organizational structure where every entity in the organization, except one, is subordinate to a single other entity. [1] This arrangement is a form of hierarchy. In an organization, this hierarchy usually consists of a singular ...
Heterarchy. A heterarchy is a system of organization where the elements of the organization are unranked (non- hierarchical) or where they possess the potential to be ranked a number of different ways. [1] Definitions of the term vary among the disciplines: in social and information sciences, heterarchies are networks of elements in which each ...
Hierarchy of the sciences. The hierarchy of the sciences is a theory formulated by Auguste Comte in the 19th century. This theory states that science develops over time beginning with the simplest and most general scientific discipline, astronomy, which is the first to reach the "positive stage" (one of three in Comte's law of three stages ...
Visual hierarchy, according to Gestalt psychology, is a pattern in the visual field wherein some elements tend to "stand out," or attract attention, more strongly than other elements, suggesting a hierarchy of importance. [1] While it may occur naturally in any visual field, the term is most commonly used in design (especially graphic design ...
Dominance hierarchy. A high-ranking male mandrill advertises his status with bright facial coloration. [1] In the zoological field of ethology, a dominance hierarchy (formerly and colloquially called a pecking order) is a type of social hierarchy that arises when members of animal social groups interact, creating a ranking system.