A surname from Czech. / Ernst Mach, Austrian physicist (1838–1916), born in Moravia (now Czech Republic).

(physics) a ratio of the speed (of an object, etc.) to the speed of sound in the fluid or other medium through which the object travels. Usually used to describe supersonic speeds; the Mach number.

Alternative spelling of mâche

(dated) A former unit of volumic radioactivity: the quantity of radon (ignoring its daughters) per litre of air which ionizes a sustained current of 0.001 esu.

(Philippines) Glutinous rice balls flavoured with coconut and pandan.

(law) Abbreviation of machine. / (law) Abbreviation of machinery.

Alternative letter-case form of Mach.

A district of Otuzco province, Peru. / A river that enters the Pacific in the north of Ecuador.

(programming) Acronym of microservices, API-first, cloud-native, headless.

(physics) The principle that the inertia of a body arises from its relation to the totality of all other bodies in the universe.