Introit
Introit , noun
[Latin introitus, from introire to go into, to enter; intro within + ire to go: compare French introit.]
1.
A going in. — Caxton
2.
(a) (Roman Catholic Church) A psalm sung or chanted immediately before the collect, epistle, and gospel, and while the priest is entering within the rails of the altar.
(b)
(Roman Catholic Church) A part of a psalm or other portion of Scripture read by the priest at Mass immediately after ascending to the altar.
3.
(Roman Catholic Church) An anthem or psalm sung before the Communion service.
4.
Any composition of vocal music appropriate to the opening of church services.