Machine/məˈʃiːn/ Definition 1 of 4Pro Tip 1/3Power Source Most machines require energy, like electricity, to operate effectively. Make sure the machine is plugged in to work. Pro Tip 2/3Moving Parts Machines typically have components that move, like gears or motors. The gears inside the clock machine keep time. Pro Tip 3/3Purposeful Design Each machine is designed to perform specific tasks efficiently. This machine is for cutting metal precisely.