Hierarchy
Revision as of 14:36, 18 June 2013 by Arthur Lathrop (talk | contribs)
Revision as of 14:36, 18 June 2013 by Arthur Lathrop (talk | contribs)
A hierarchy is a system of ranking and organizing entities or people, where each element of the system (except for the top element) is subordinate to a single other element.