In physics, mass is a property of a physical system or body, giving rise to the phenomena of the body's resistance to being accelerated by a force and the strength of its mutual gravitational attraction with other bodies. Instruments such as mass balances or scales use those phenomena to measure mass. The SI unit of mass is the kilogram .

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  1. Matter, material.
    1. 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.
      1. Precious metal, especially gold or silver.
  1. The quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement.
  1. A medicinal substance made into a cohesive, homogeneous lump, of consistency suitable for making pills; as, blue mass.
  2. A palpable or visible abnormal globular structure; a tumor.
  3. Excess body weight, especially in the form of muscle hypertrophy.
    1. A large quantity; a sum.
  1. Large in number.
    1. Bulk; magnitude; body; size.
      1. The principal part; the main body.
      2. A large body of individuals, especially persons.
    2. The lower classes of persons.

Noun (etymology 2)

  1. The Eucharist, now especially in Roman Catholicism.
  2. Celebration of the Eucharist.
  3. The sacrament of the Eucharist.
  4. A musical setting of parts of the mass.


  1. To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.
  2. To have a certain mass.
    I mass 70 kilograms

Verb (etymology 2)

  1. To celebrate mass.


  1. Involving a mass of things; cencerning a large quantity or number.
    There is evidence of mass extinctions in the distant past.
  2. Involving a mass of people; of, for, or by the masses.
    Mass unemployment resulted from the financial collapse.

The above text is a snippet from Wiktionary: mass
and as such is available under the Creative Commons Attribution/Share-Alike License.

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