(uncountable) A type of pasta in the form of short tubes; sometimes loosely, pasta in general.

(historical) Chic, fashionable, stylish; in the manner of a macaroni.

A machine, usually automatic, that washes clothes, etc.

An electrically driven fan for generating currents of air during the production of films etc.

An automatic machine that dispenses merchandise in return for money.

(computing theory) A Turing machine capable of simulating the behavior of any Turing machine.

(physics) The ratio of the velocity of a body to that of sound in the surrounding medium.

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.

A type of fully automatic firearm that fires bullets in rapid succession by a single action of the trigger and is capable of sustained fire.