(Christianity) A religious card that states that a Catholic Mass has been said in honour of a dead person, or as a request for special favours such as improved health or success in a worldly endeavour.

(geology) the movement downslope of soil and rock in response to gravity

(physics) the difference between the mass of an atom and the sum of the masses of its individual components in the free state; equivalent to the binding energy

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