What is the meaning of perpetual motion machine?

noun

  • A machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). perpetual motion machine. Retrieved September 21, 2026, from http://smartdefine.org/perpetual_motion_machine/definitions/1206689
ChicagoWordNet. 2010. "perpetual motion machine" http://smartdefine.org/perpetual_motion_machine/definitions/1206689 (accessed September 21, 2026).
HarvardWordNet 2010, perpetual motion machine, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/perpetual_motion_machine/definitions/1206689>.
MLAWordNet. "perpetual motion machine" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/perpetual_motion_machine/definitions/1206689>