INTROGRESSION In`tro*gres"sion, n. Etym: [L. introgressus, p. p. of introgredi to go in; intro- within + gradi to step, go.]
Defn: The act of going in; entrance. Blount.
INTROIT In*tro"it, n. Etym: [L. introitus, fr. introire to go into, to enter; intro within + ire to go: cf. F. introit.]
1. A going in. Caxton.
2. (R. C. Ch.) (a) 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) A part of a psalm or other portion of Scripture read by the priest at Mass immediately after ascending to the altar.
3. (R. C. Ch.)
Defn: An anthem or psalm sung before the Communion service.
4. Any composition of vocal music appropriate to the opening of church services.
INTROMISSION
In`tro*mis"sion, n. Etym: [Cf. F. intromission. See Intromit.]
1. The act of sending in or of putting in; insertion. South.