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Machine, device, having a unique purpose, that augments or replaces human or animal effort for the accomplishment of physical … Of, relating to, or felt to resemble a machine: Machines are often designed to yield a high mechanical advantage to reduce the effort needed to do that work. The meaning of machine is a mechanically, electrically, or electronically operated device for performing a task. A machine is a physical system that uses power to apply forces and control movement to perform an action.