n. The celebration of the Lord's Supper or eucharist.n. The office for the celebration of the eucharist; the liturgy.n. The sacrament of the eucharist or holy communion.n. A musical setting of certain parts of the Roman Catholic liturgy, also of corresponding parts of the Anglican liturgy.n. A church festival or feast-day: now only in composition: as, Candlemas, Childermas, Christmas, Lammas, Martinmas, Marymas, Michaelmas, Roodmas (compare kermess).n. Any mass where only the priest communicates, especially such a mass celebrated in a private oratory.To celebrate mass.n. A body of coherent matter; a lump, particularly a large or unformed lump: as, a mass of iron or lead; a mass of flesh; a mass of rock.n. An assemblage or collection of incoherent particles or things; an agglomeration; a congeries; hence, amount or number in general: as, a mass of sand; a mass of foliage, of troops, etc.n. The bulk or greater part of anything; the chief portion; the main body.n. Bulk in general; magnitude; massiveness.n. The quantity of any portion of matter as expressed in pounds or grams, and measured on an ordinary balance with the proper reduction for the buoyancy of the atmosphere; otherwise, the relative inertia, or power in reaction, of a body.n. In entomology, the terminal joints collectively of an antenna when they are enlarged and closely appressed to each other, forming a clava or club.n. A large bunch of strung beads (12 small bunches fastened together).To form into a mass; collect into masses; assemble in one body or in close conjunction: as, to mass troops at a certain place; to mass the points of an argument.To strengthen, as a building for the purpose of fortification.To collect in masses; assemble in groups or in force.n. See mas.n. In pharmacy, a preparation of thick, pasty consistency with which is incorporated some active medicinal substance: the mass is made up into pills of definite size and weight for administration.n. In the fine arts, any large and simple expanse of form, light, shade, or color, in which the details of a composition arrange themselves.n. In electrochemistry, the concentration of that fraction of the electrolyte which, at the given dilution, is dissociated into ions, and is therefore capable of carrying the electric current.n. An abbreviation of Massachusetts.