(physics, chemistry) A conservation law of classical physics that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

Any means of public communication that reaches a large audience.

Of a product: produced in large numbers, and designed to appeal to many different people.

plural of mass noun

The killing of a large number of people over a short period of time.

plural of mass murder

Someone who commits a mass murder.

Alternative form of en masse

Method of transport, usually public, that carries people in greater quantities than a typical private method such as car.

The formalities that accompany a mass burial