1 large amount/number of sth
ADJ. enormous, great, huge, large, vast | broad Their policies appeal to the broad mass of the population. | formless, shapeless When I washed the jumper, it just turned into a shapeless mass. | compact, dense, solid | chaotic a chaotic mass of ideas | tangled a tangled mass of hair
PREP. ~ of a dense mass of smoke | ~es of (informal) There were masses of people at the concert.
2 Mass: Christian ceremony
ADJ. requiem, Sunday
VERB + MASS attend, go to, hear She never failed to attend Sunday Mass. | celebrate, offer, say The local priest celebrates Mass in the village church.
PREP. ~ for a requiem Mass for the sailors who drowned