| 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 Arts.
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| 7. | the main body, bulk, or greater part of anything: the great mass of American films. |
| 8. | Physics. the quantity of matter as determined from its weight or from Newton's second law of motion. Abbreviation: m Compare weight (def. 2), relativistic mass, rest mass. |
| 9. | Pharmacology. 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. |
| 11. | pertaining to, involving, or affecting a large number of people: mass unemployment; mass migrations; mass murder. |
| 12. | participated in or performed by a large number of people, esp. together in a group: mass demonstrations; mass suicide. |
| 13. | pertaining to, involving, or characteristic of the mass of the people: the mass mind; a movie designed to appeal to a mass audience. |
| 14. | reaching or designed to reach a large number of people: television, newspapers, and other means of mass communication. |
| 15. | done on a large scale or in large quantities: mass destruction. |
| 16. | to come together in or form a mass or masses: The clouds are massing in the west. |
| 17. | to gather into or dispose in a mass or masses; assemble: The houses are massed in blocks. |

In physics, the property of matter that measures its resistance to acceleration. Roughly, the mass of an object is a measure of the number of atoms in it. The basic unit of measurement for mass is the kilogram. (See Newton's laws of motion; compare weight.)
mass (mās)
n.
A unified body of matter with no specific shape.
A grouping of individual parts or elements that compose a unified body of unspecified size or quantity.
The physical volume or bulk of a solid body.
Abbr. m The measure of the quantity of matter that a body or an object contains. The mass of the body is not dependent on gravity and therefore is different from but proportional to its weight.
A thick, pasty pharmacological mixture containing drugs from which pills are formed.
One of the seven fundamental SI units, the kilogram.
See massa.