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English definition of “hierarchy”

hierarchy

noun [C]     /ˈhaɪə.rɑː.ki/ US  /ˈhaɪr.ɑːr-/
C2 a system in which people or things are arranged according to their importance : Some monkeys have a very complex social hierarchy. He rose quickly through the political hierarchy to become party leader .Classifying and creating order the people in the upper levels of an organization who control itPeople in charge of or controlling other peopleBosses, managers and directorsBosses, managers and directorsPeople in charge of or controlling other people hierarchical     /ˌhaɪəˈrɑː.kɪ.kəl/ US  /ˌhaɪrˈɑːr-/ adjective C2 It's a very hierarchical organization in which everyone's status is clearly defined .Classifying and creating order hierarchically     /ˌhaɪəˈrɑː.kɪ.kəl.i/ US  /ˌhaɪrˈɑːr-/ adverb The company is hierarchically structured .Classifying and creating order
(Definition of hierarchy noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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