Collins Concise English Dictionary © HarperCollins Publishers::
Mass. abbreviation for
  1. Massachusetts
WordReference Random House Learner's Dictionary of American English © 2026
mass /mæs/USA pronunciation   n. 
  1. a body of matter, usually of indefinite shape:[countable]took a mass of dough and spread it on the pan.
  2. a collection of particles thought of as forming one body:[countable]a mass of sand.
  3. a large number;
    a great deal of:[countable]a mass of errors.
  4. the greater part of something:[countable* usually singular]the great mass of American films.
  5. the entire collection (of something);
    aggregate;
    whole:[uncountable]People, in the mass, mean well.
  6. bulk;
    massiveness:[uncountable]towers of great mass.
  7. Physics[uncountable]the quantity or amount of physical matter of a thing as figured from its weight or from Newton's second law of motion. Abbr.: m
  8. the masses, [plural] common people thought of as a whole:an appeal to the masses.

adj. [before a noun]
  1. of or relating to a large number of people:mass unemployment.
  2. done on a large scale:weapons of mass destruction.

v. 
  1. to (cause to) come together in or form a mass: [no object]Clouds were massing in the west.[+ object]The general massed his troops for battle.

mass1 /mæs/USA pronunciation   n. 
  1. [often: Mass] the ceremony of the Eucharist: [uncountable]Mass is held on Sunday.[countable]The priest performed two Masses each Sunday.

Mass.,  an abbreviation of:
  1. Place NamesMassachusetts.

WordReference Random House Unabridged Dictionary of American English © 2026
mass  (mas),USA pronunciation n. 
  1. a body of coherent matter, usually of indefinite shape and often of considerable size:a mass of dough.
  2. a collection of incoherent particles, parts, or objects regarded as forming one body:a mass of sand.
  3. aggregate; whole (usually prec. by in the):People, in the mass, mean well.
  4. a considerable assemblage, number, or quantity:a mass of errors; a mass of troops.
  5. bulk, size, expanse, or massiveness:towers of great mass and strength.
  6. Fine Art
    • [Painting.]an expanse of color or tone that defines form or shape in general outline rather than in detail.
    • a shape or three-dimensional volume that has or gives the illusion of having weight, density, and bulk.
  7. the main body, bulk, or greater part of anything:the great mass of American films.
  8. Physicsthe quantity of matter as determined from its weight or from Newton's second law of motion. Abbr.: m  Cf. weight (def. 2), relativistic mass, rest mass. 
  9. Drugs[Pharm.]a preparation of thick, pasty consistency, from which pills are made.
  10. the masses, the ordinary or common people as a whole;
    the working classes or the lower social classes.

adj. 
  1. pertaining to, involving, or affecting a large number of people:mass unemployment;mass migrations;mass murder.
  2. participated in or performed by a large number of people, esp. together in a group:mass demonstrations; mass suicide.
  3. pertaining to, involving, or characteristic of the mass of the people:the mass mind; a movie designed to appeal to a mass audience.
  4. reaching or designed to reach a large number of people:television, newspapers, and other means of mass communication.
  5. done on a large scale or in large quantities:mass destruction.

v.i. 
  1. to come together in or form a mass or masses:The clouds are massing in the west.

v.t. 
  1. to gather into or dispose in a mass or masses;
    assemble:The houses are massed in blocks.
  • Greek mâza barley cake, akin to mássein to knead
  • Latin massa mass
  • Middle English masse 1350–1400
mass•ed•ly  (masid lē, mastlē),USA pronunciation adv. 
    2. assemblage, heap, congeries. 4. collection, accumulation, pile, conglomeration. 5. magnitude, dimension. See size 1. 7. majority. 10. proletariat, plebeians. 17. collect, marshal, amass, aggregate.
    17. disperse.

Mass  (mas),USA pronunciation n. 
  1. Religionthe celebration of the Eucharist. Cf. High Mass, Low Mass. 
  2. Music and Dance(sometimes l.c.) a musical setting of certain parts of this service, as the Kyrie eleison, Gloria, Credo, Sanctus, Benedictus, and Agnus Dei.
  • Vulgar Latin *messa, Late Latin missa, formally feminine of Latin missus, past participle of mittere to send, dismiss; perh. extracted from a phrase in the service with missa est and a feminine subject
  • Middle English masse, Old English mæsse bef. 900

Mass., 
  1. Place NamesMassachusetts.

'Mass.' also found in these entries (note: many are not synonyms or translations):

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