The part of the Order of Mass that includes the Readings, Creed, Petitions and Penitential Rite. This comes after the Introductory Rites and before the Liturgy of the Eucharist.
This typically includes:
Lesson
Gradual Psalm
Epistle
Gospel Acclamation
Gospel Proclamation
Homily
Creed
Prayers of the People
Penitential Rite
Comfortable words