Meaning of “hierarchy” - Learner’s Dictionary

hierarchy

noun [ C ] us uk /ˈhaɪərɑːki/

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

hierarchical adjective us uk /ˌhaɪəˈrɑːkɪkəl/

a hierarchical structure

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