A grave containing many corpses.

(astronomy) A unit, equal to the mass of the sun, used to express the mass of other stars etc. 1 M_☉ = 2 × 10³⁰ kg.

(meteorology) A particular volume of air, especially one having a roughly uniform temperature, pressure and water vapour content.

plural of mass grave

(transitive) To manufacture (something) on a large scale, especially by using assembly lines.

produced by mass production

simple past tense and past participle of mass-produce

A large-scale transportation system in which the passengers do not travel in their own vehicles.

(physics) The unit of mass in the system of Planck units, defined as: m_P=√≈2.1765⨯10⁻⁸ mbox kg

(Christianity) A special mass over and above those ordinarily said for the day, for some particular grace or purpose, and provided by some individual.