(law) Abbreviation of United States District Court for the District of Massachusetts, as used in case citations.

(astronomy) A unit of mass equal to the mass of the planet Jupiter, used to express the mass of other planets. 1 M_J = 2 × 10²⁷ kg.

(astronomy) A unit of mass equal to that of the Earth, used to express the mass of other planets etc. 1 M_🜨 = 6 × 10²⁴ kg.

plural of rest mass

plural of center of mass

(physics) The portion of an isotope shift produced by the changing mass of a nucleus upon the addition of a neutron

plural of mass shift

plural of atomic mass

Used other than figuratively or idiomatically: see mass, destruction. / (uncountable, idiomatic) Killing of large numbers of people.

The net movement of material matter from one location to another.