IPA: /ˈdaɪ.ə.sɪs/
KK: /ˈdaɪəsɪs/
A region or area that is managed by a bishop, which includes several churches.
The bishop visited each church in his diocese to offer support and guidance.
Diocese is derived from the Latin "dioecesis" (meaning administration or jurisdiction) which comes from the Greek "dioikesis" (meaning administration or management). The word refers to a district under the pastoral care of a bishop in the Christian Church, emphasizing the administrative aspect of church governance.
Think of 'administration' when you hear 'diocese' — it refers to the area managed by a bishop.