Perpetual-motion meaning

The hypothetical continuous operation of an isolated mechanical device or other closed system without a sustaining energy source.
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Hypothetical ability of some device to move or operate indefinitely by creating its own energy in excess of that used or dissipated.
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The state of such indefinite movement or operation.
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The motion of some hypothetical device that continues forever with no obvious input of energy in violation of the laws of thermodynamics.
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