IPA: /ˈhaɪəˌrɑːki/
KK: /haɪˈrɑːrki/
A system or organization in which people or things are ranked one above the other according to their status or authority.
In a corporate hierarchy, the CEO is at the top, followed by managers and employees.
Hierarchy → It is formed from "hierarchia" (from Greek "hierarkhēs", meaning sacred ruler) and the suffix "-y" (indicating a state or condition). The word refers to a system of organization where people or groups are ranked one above the other according to status or authority.
Think of a 'sacred ruler' ('hierarkhēs') at the top of a system, which helps you remember that 'hierarchy' is about ranking and organization.