Hierarchy


 * 1) A hierarchy (in Greek hieros, sacred, and arkho, rule) is a system of ranking and organizing things.
 * 2) A group of people, or things arranged in order of rank or grade.
 * 3) A system of dividing people or things into rank
 * 4) An ordering of groups in which larger groups encompass [phone number lookup] sets of smaller groups.
 * 5) Any system where there is a parent-child relationship.
 * 6) A group of people, ideas, objects, etc. arranged in a graded series (high to low, good to bad, etc.).
 * 7) In computer science's object-oriented programming, the mapped relationships of sub- and superclasses is known as a hierarchy.

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