the sacrifice in the sacrament of the eucharist, or the consecration and oblation of the host.-the portions of the mass usually set to music, considered as a musical composition; -- namely, the kyrie, the gloria, the credo, the sanctus, and the agnus dei, besides sometimes an offertory and the benedictus.-to celebrate mass.-a quantity of matter cohering together so as to make one body, or an aggregation of particles or things which collectively make one body or quantity, usually of considerable size; as, a mass of ore, metal, sand, or water.-a medicinal substance made into a cohesive, homogeneous lump, of consistency suitable for making pills; as, blue mass.-a large quantity; a sum.-bulk; magnitude; body; size.-the principal part; the main body.-the quantity of matter which a body contains, irrespective of its bulk or volume.-to form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.