American English

Definition of hierarchy noun from the Oxford Advanced American Dictionary

      

    hierarchy

     noun
    noun
    NAmE//ˈhaɪəˌrɑrki//
     
    (pl. hierarchies)
     
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  1. 1[countable, uncountable] a system, especially in a society or an organization, in which people are organized into different levels of importance from highest to lowest the social/political hierarchy She's quite high up in the management hierarchy.
  2. 2[countable] the group of people in control of a large organization or institution
  3. 3[countable] (formal) a system that ideas or beliefs can be arranged into a hierarchy of needs
See the Oxford Advanced Learner's Dictionary entry: hierarchy