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A bishop is an ordination member of the Christian clergy. In those  Christian churches that maintain an episcopal form of church government, a bishop holds a position of authority. Their roles can differ significantly in the various denominations.
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n. bishop, church official who oversees a number of Christian churches

= bishop.
Ex: This is a biography of Canon Foster, whose work included the preservation, sorting, conservation and listing of the records of bishops, archdeacons, deans and chapters.