IPA: /ˌɑːrʧˈdaɪəˌsiːzən/
KK: /ɑrʧˈdaɪəsɪsən/
Connected to a major church district led by an archbishop.
The archdiocesan council met to discuss community outreach programs.
Archdiocesan → It is formed from "arch-" (meaning chief or principal) and "diocesan" (from Latin "diocesis", meaning a district under the pastoral care of a bishop). The word refers to something pertaining to the chief diocese or the principal district overseen by an archbishop.
Think of 'arch-' meaning chief and 'diocesan' relating to a district under a bishop's care — this helps you remember that 'archdiocesan' refers to the chief district overseen by an archbishop.