An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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perpetual motion
  جنبش ِ همیشگی  
jonbeš-e hamišegi
Fr.: mouvement perpétuel  

The motion of a hypothetical machine which, once set in motion, will go on for ever without any losses due to → friction or other forms of → dissipation of energy and without receiving any external energy.

See also: → perpetual; → motion.