Definition of diocese noun from the Oxford Advanced Learner's Dictionary

 

diocese

 noun
noun
BrE BrE//ˈdaɪəsɪs//
 
; NAmE NAmE//ˈdaɪəsɪs//
 
(pl. dioceses
BrE BrE//ˈdaɪəsiːz//
 
; NAmE NAmE//ˈdaɪəsiːz//
 
)
 
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(in the Christian Church) a district for which a bishop is responsible Word Origin Middle English: from Old French diocise, from late Latin diocesis, from Latin dioecesis ‘governor's jurisdiction, diocese’, from Greek dioikēsis ‘administration, diocese’, from dioikein ‘keep house, administer’.
See the Oxford Advanced American Dictionary entry: diocese