INTROIT
- part of a psalm with antiphon recited by the celebrant of the Mass at the foot of the altar and, at High Mass, sung by the choir when the priest begins the Mass
- psalm or anthem sung as the celebrant of the Holy Communion enters the sanctuary
- choral response sung at the beginning of a religious service
- psalm or antiphon sung or said at the start of a service [n -S]
- music sung at the beginning of a worship service [n INTROITS]