Webster's Revised Unabridged Dictionary · 1913

Diocesan

Diocesan (?; 277) , adjective

[Late Latin dioecesanus: compare French diocésain.]

Of or pertaining to a diocese; as, diocesan missions.

Diocesan , noun

1.
A bishop, viewed in relation to his diocese; as, the diocesan of New York.
2.
The clergy or the people of a diocese. — Strype