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Introit — A going in.
Introit — A psalm sung or chanted immediately before the collect, epistle, and gospel, and while the priest is entering within the rails of the altar.
Introit — A part of a psalm or other portion of Scripture read by the priest at Mass immediately after ascending to the altar.
Introit — An anthem or psalm sung before the Communion service.
Introit — Any composition of vocal music appropriate to the opening of church services.