stepper

noun

• A person or animal that steps, especially energetically or high.
• A dancer.
• A kind of electric motor (a stepper motor) that advances in steps rather than smoothly.
• A device used in the manufacture of microcircuits to apply a photolithographic image repeatedly, at regular intervals (by imaging, moving a step and repeating).
• A type of exercise machine.
• Anything that moves or advances in steps.