In-trō'it, n.

n. [Lat. introitus, from introire, introitum, to go into, to enter, from intro, within, and ire, itum, to go; It., Sp., & Pg. introito, Fr. & Pr. introit.] (Anc. Church & Rom. Cath. Church.) A psalm sung or chanted immediately before the collect, epistle, and gospel, and while the priest was entering within the rails of the altar;—now used as a name for any musical vocal composition appropriate to the opening of church service, or church service in general.