Below are possible answers for the crossword clue A diocese's main church.
9 letter answer(s) to a diocese's main church
CATHEDRAL
a church which a bishop affirms as the chief church in his diocese by placing his chair (in Greek, 'cathedra') or throne in it
at present, your definitions of cathedral and cathedrals do not quite match
any large and important church
relating to or containing or issuing from a bishop's office or throne; "a cathedral church"
the principal Christian church building of a bishop's diocese
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