التدرج meaning in بالإنجليزية

Hierarchy▼[UK: ˈhaɪə.rɑːk.i] [US: ˈhaɪə.ˌrɑːrk.i]

Hierarchies▼[UK: ˈhaɪə.rɑːkɪz] [US: ˈhaɪ.ˌrɑːrkiz]