A more thorough explanation:

ECCLESIASTICAL

Ecclesiastical means related to the church, especially as an institution. It can also be called ecclesiastic.

• The ecclesiastical hierarchy of the Catholic Church includes the Pope, cardinals, bishops, and priests.
• The cathedral's architecture reflects its ecclesiastical significance as a place of worship.

These examples illustrate how ecclesiastical is used to describe things related to the church as an institution. The first example shows how the term is used to describe the hierarchy of the Catholic Church, while the second example shows how it is used to describe the architecture of a cathedral, which is a building used for religious purposes.