In the strict canonical sense, "prelate" denominates a priest or bishop who is ordinary of a personal prelature (see below), which is a functional equivalent of a diocese that has a "particular pastoral or missionary work for various regions or for different social groups" (cf.

What is a prelate in the Catholic Church?

prelate, an ecclesiastical dignitary of high rank. In the modern Roman Catholic church, prelates are those who exercise the public power of the church.

What is a prelate to the Pope?

: a priest having permanent honorary membership in the papal household.