Meaning of “hierarchy” - Learner’s Dictionary

hierarchy

noun [ C ] uk us /ˈhaɪərɑːki/

a system or organization in which people or things are arranged according to their importance

hierarchical uk us /ˌhaɪəˈrɑːkɪkəl/ adjective

a hierarchical structure

(Definition of “hierarchy” from the Cambridge Learner’s Dictionary © Cambridge University Press)