The Collaborative International Dictionary
Presbyterium \Pres`by*te"ri*um\, n. [L.] (Arch.) Same as Presbytery, 4.
Wiktionary
n. (context architecture English) A presbytery.
Wikipedia
Presbyterium is a modern term used in the Catholic Church and Eastern Catholic Churches after the Second Vatican Council in reference to a college of priests, in active ministry, of an individual particular church such as a diocese or eparchy. The body, in union with their bishop as a collective, is a symbol of the collaborative and collegial nature of their sacerdotal ministry as inspired by the reforms made during the Second Vatican Council.
The presbyterium is most visible during the ordination of new priests and bishops and the Mass of the Chrism: the Holy Thursday Mass where the blessing of the oils used in the sacraments of Baptism, Confirmation, Anointing of the Sick, and Holy Orders takes place. They are also visible during other special liturgical functions such as the wake and burial of their bishop.
Liturgically, within Catholicism, the presbyterium is the area of the church in which the clergy functions. It is more commonly called the sanctuary.
Usage examples of "presbyterium".
The chapel itself was divided into two parts, separated by Mino da Fiesole's carved screen: the half for laymen, which he was going to paint first, the larger division, or presbyterium, for cardinals.