In*tro"it (?), n. [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.) An anthem or psalm sung
before the Communion service.
4. Any composition of vocal music appropriate
to the opening of church services.