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hierarchy  (hierarchies plural )
1  n-var A hierarchy is a system of organizing people into different ranks or levels of importance, for example in society or in a company. 
Like most other American companies with a rigid hierarchy, workers and managers had strictly defined duties...  
2  n-count-coll The hierarchy of an organization such as the Church is the group of people who manage and control it. 
3  n-count A hierarchy of  ideas and beliefs involves organizing them into a system or structure. 
FORMAL ...the notion of `cultural imperialism' implies a hierarchy of cultures, some of which are stronger than others.