•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.

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