(1):

(n.) Any composition of vocal music appropriate to the opening of church services.

(2):

(n.) An anthem or psalm sung before the Communion service.

(3):

(n.) A part of a psalm or other portion of Scripture read by the priest at Mass immediately after ascending to the altar.

(4):

(n.) A psalm sung or chanted immediately before the collect, epistle, and gospel, and while the priest is entering within the rails of the altar.

(5):

(n.) A going in.