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 Definitions of perpetual motion  [ərˈpɛtʃ u əl]  

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Definition of 'perpetual motion' Random House Webster's College Dictionary 

1. (n.) perpetual motion
the motion of a theoretical mechanism that, without any losses due to friction or other forms of dissipation of energy, would continue to operate indefinitely at the same rate without any external energy being applied to it.

Etymology:  (1585–95)

Definition of 'perpetual motion' Princeton's WordNet 

1. (noun) perpetual motion
motion that continues indefinitely without any external source of energy; impossible in practice because of friction

'perpetual motion' - Nearby Entries  

perpetual  perpetual calendar  perpetual motion  perpetual motion machine  perpetual warrant  perpetually  perpetuate  



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"perpetual motion." Definitions.net. STANDS4 LLC, 2012. 16 February. 2012. http://www.definitions.net/definition/perpetual motion


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